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1.  A dimer of bis­(N-heterocyclic carbene)rhodium(I) centres spanned by a dibenzo-18-crown-6 bridge from synchrotron radiation 
The compound (μ-3,3′,3′′,3′′′-{[2,5,8,15,18,21-hexa­oxatricyclo­[20.4.0.09,14]hexa­cosa-1(22),9,11,13,23,25-hexa­ene-11,12,24,25-tetra­yl]tetra­kis­(methyl­ene)}tetra­kis­(1-methyl-1H-imidazol-2-yl))bis­[(η4-cyclo­octa-1,4-diene)rhodium(I)] bis­(hexa­fluoridophosphate) acetonitrile sesquisolvate dihydrate, [Rh2(C8H12)2(C40H42N8O6)](PF6)2·1.5CH3CN·2H2O, crystallized from acetonitrile under an atmosphere of diethyl ether. In the crystal structure, the complex cation exhibits two square-planar RhI centres, each bound by a cyclo­octa­diene (COD) ligand and by two adjacent imidazolyl­idene N-heterocyclic carbene (NHC) donors from the same phen­oxy ring of the {[dibenzo-18-crown-6-11,12,24,25-tetra­yl]tetra­kis­(methyl­ene)}tetra­kis­(1-methyl-1H-imidazol-2-yl) (L) ligand. The dibenzo-crown ether bridge of L spans the Rh centres and forms hydrogen bonds with water mol­ecules. One water mol­ecule with half occupancy bridges adjacent macrocycles in the lattice. Another water with full occupancy forms weak hydrogen bonds to the crown ether O atoms and is, in turn, part hydrogen bonded by a lattice water with half occupancy. The latter water is within hydrogen-bonding distance of a fourth water also with partial occupancy. The result of these inter­actions is the formation of a layer in the ab plane. Two PF6 − ions, one of which is twofold disordered, and one ordered and one twofold disordered (with 0.5 occupancy) lattice acetonitrile mol­ecules complete the crystal structure.
doi:10.1107/S160053681204901X
PMCID: PMC3588264  PMID: 23476343
2.  [μ-3,3′-Diisopropyl-1,1′-(propane-1,3-di­yl)bis­(1,3-diazinan-2-yl­idene)]bis­[bromido­(η4-cyclo­octa-1,5-diene)rhodium(I)] 
The title compound, [Rh2Br2(C8H12)2(C17H32N4)], was obtained by the reaction of 3,3′-(propane-1,3-di­yl)bis­(1-isopropyl-3,4,5,6-tetra­hydro­pyrimidin-1-ium) bromide and [{Rh(cod)Cl}2] (cod is cyclo­octa-1,5-diene) in tetra­hydro­furan. The two RhI atoms each have a distorted square-planar coordination environment, defined by a bidentate cod ligand, a bromide anion and one C atom of the bridging bidentate bis-N-heterocyclcic carbene (NHC) ligand. The average Rh—CNHC distance is 2.038 (7) Å, suggesting that the bond has a major σ contribution with very little back donation. The distances between the cod ligands and the RhI atoms vary between 2.104 (4) and 2.210 (4) Å.
doi:10.1107/S1600536814001135
PMCID: PMC3998270  PMID: 24764831
3.  (N-Benzoyl-N′,N′-diphenyl­thio­ureato-κ2 S,O)(η4-cyclo­octa-1,5-diene)rhodium(I) 
The title complex, [Rh(C20H15N2OS)(C8H12)], exhibits an essentially square-planar coordination environment around the RhI atom, which bears a bidentate cyclo­octa­diene ligand as well as a monoanionic bidentate benzoyl­thio­ureate ligand. The RhI atom, the S- and O-donor atoms and the alkene centroids of the cyclo­octa­diene ligand do not deviate by more than 0.031 Å from their least mean-squares plane.
doi:10.1107/S1600536812029753
PMCID: PMC3414120  PMID: 22904727
4.  Bis[1,2-bis­(dimethyl­phosphino)ethane-κ2 P,P′]rhodium(I) dichlorido[(1,2,5,6-η)-1,5-cyclo­octa­diene]rhodium(I) 
In the title complex, [Rh(C6H16P2)2][RhCl2(C8H12)], the asymmetric unit contains two [Rh(dmpe)2] [dmpe = 1,2-bis­(dimethyl­phosphino)ethane] half-cations, lying on inversion centers, and an [RhCl2(cod)]− (cod = 1,5-cyclo­octa­diene) anion, wherein Rh is coordinated by two chloride ligands and two olefinic π-bonds of the cyclo­octa­diene ligand. The Rh atoms in the cations and anion exhibit square-planar coordination and are separated without any unusual inter­actions.
doi:10.1107/S1600536808032509
PMCID: PMC2959718  PMID: 21580855
5.  (18-Crown-6)potassium [(1,2,5,6-η)-cyclo­octa-1,5-diene][(1,2,3,4-η)-naph­tha­lene]­ferrate(−I) 
The title salt, [K(C12H24O6)][Fe(C8H12)(C10H8)], is the only known naphthalene complex containing iron in a formally negative oxidation state. Each (naphthalene)(1,5-cod)ferrate(−I) anion is in contact with one (18-crown-6)potassium cation via K⋯C contacts to the outer four carbon atoms of the naphthalene ligand (cod = 1,5-cyclo­octa­diene, 18-crown-6 = 1,4,7,10,13,16-hexa­oxacyclo­octa­deca­ne). When using the midpoints of the coordinating olefin bonds, the overall geometry of the coordination sphere around iron can be best described as distorted tetra­hedral. The naphthalene fold angle between the plane of the iron-coordinating butadiene unit and the plane containing the exo-benzene moiety is 19.2 (1)°.
doi:10.1107/S160053681203704X
PMCID: PMC3470125  PMID: 23125569
6.  (N-Benzoyl-N′-phenyl­thio­urea-κS)chlorido(η4-1,5-cyclo­octa­diene)rhodium(I) 
The title compound, [RhCl(C8H12)(C14H12N2OS)], is a rhodium(I) derivative with a functionalized thio­urea ligand. Despite the presence of several heteroatoms, the thio­urea ligand coordinates only in a monodentate fashion via the S atom. The geometry of the coordination sphere is approximately square planar about the RhI atom, with two bonds to the π-electrons of the 1,5-cyclo­octa­diene ligand, one bond to the Cl− ligand and one bond to the S atom of the thio­urea ligand. The mol­ecular structure is stabilized by intra­molecular N—H⋯O and N—H⋯Cl hydrogen bonding. Inter­molecular N—H⋯O hydrogen-bonding inter­actions lead to the formation of layers extending parallel to (011).
doi:10.1107/S1600536810029740
PMCID: PMC3007502  PMID: 21588103
7.  Dichlorido(η4-cyclo­octa-1,5-diene)bis­(triphenyl­phosphine)osmium(II) 
The OsII atom in the title compound, [OsCl2(C8H12)(C18H15P)2], is located on a crystallographic twofold axis and adopts a distorted octa­hedral coordination geometry. The two triphenyl­phosphine ligands are trans to each other, while the two chlorine ligands are cis-disposed. The coordination is completed by the cyclo­octa­diene (COD) ligand with bonding to the two olefin double bonds. The C=C bond has a length of 1.403 (6) Å, which is significntly longer than a free olefinic double bond (≃1.34 Å).
doi:10.1107/S1600536809037817
PMCID: PMC2970349  PMID: 21577759
8.  trans-Carbonyl­chloridobis(tri-p-tolyl­phosphine)rhodium(I) acetone solvate 
The title compound, [RhCl(C21H21P)2(CO)]·C3H6O, was precipitated in trace yield from a reaction of RhCl(cod)(THP) with P(p-tol)3 in a 1:1 acetone-d 6/CD3OD solution under a hydrogen atmosphere [p-tol = p-tolyl, THP = tris­(hydroxy­meth­yl)phosphine, P(CH2OH)3, and cod = 1,5-cyclo­octa­diene]. The complex displays a square-planar geometry around the RhI atom. The complex mol­ecules and the acetone mol­ecules are linked into a chain along the a axis by inter­molecular C—H⋯Cl and C—H⋯O hydrogen bonds.
doi:10.1107/S1600536808003528
PMCID: PMC2960764  PMID: 21201856
9.  Chlorido(η 4-cyclo­octa-1,5-diene)(N,N′-diethyl­thio­urea-κS)rhodium(I) 
In the title rhodium(I) complex, [RhCl(C8H12)(C5H12N2S)], N,N′-diethyl­thio­urea acts as a monodenate S-donor ligand. The rhodium(I) coordination sphere is completed by the Cl atom and the COD [= 1,5-cyclo­octa­diene] ligand inter­acting through the π-electrons of the double bonds. If the midpoints of these two bonds are taken into account, the Rh atom exhibits a distorted square-planar coordination. The syn conformation of the N,N′-diethyl­thio­urea ligand with respect to the Cl atom is stabilized by an intra­molecular N—H⋯Cl hydrogen bond. A weak inter­molecular N—H⋯Cl inter­action links mol­ecules along the a axis.
doi:10.1107/S1600536810039644
PMCID: PMC3009226  PMID: 21588809
10.  Bis(acetonitrile-κN)dichlorido(η4-cyclo­octa-1,5-diene)ruthenium(II) acetonitrile monosolvate 
In the title RuII complex, [RuCl2(C8H12)(C2H3N)2]·CH3CN, the metal ion is coordinated to the centers of each of the double bonds of the cyclo­octa­diene ligand, to two chloride ions (in cis positions) and to two N-atom donors (from MeCN mol­ecules) that complete the coordination sphere for the neutral complex. The coordination about the RuII atom can thus be considered to be octa­hedral with a slightly trigonal distortion. There is also one acetonitrile solvent mol­ecule per mol­ecule which is outside the coordination sphere of the ruthenium atom.
doi:10.1107/S1600536811027723
PMCID: PMC3212168  PMID: 22090870
11.  μ-Oxido-bis­[hydridotris(tri­methyl­phosphane-κP)iridium(III)](Ir—Ir) bis­(tetra­fluorido­borate) dihydrate 
The title compound, [Ir2H2O(C3H9P)6](BF4)2·2H2O, was isolated from the reaction between [Ir(COD)(PMe3)3]BF4 and H2 in water (COD is cyclo­octa-1,5-diene). The asymmetric unit consists of one IrIII atom bonded to three PMe3 groups, one hydride ligand and half an oxide ligand, in addition to a BF4 − counter-ion and one water molecule of hydration. The single oxide ligand bridging two IrIII atoms is disordered across an inversion center with each O atom having a 50% site occupancy. Each IrIII atom has three PMe3 groups occupying facial positions, with the half-occupancy O atoms, a hydride ligand and an Ir—Ir bond completing the coordination sphere. The Ir—Ir distance is 2.8614 (12) Å, comparable to other iridium(III) metal–metal bonds. Two water mol­ecules hydrogen bond to two BF4 − anions in the unit cell.
doi:10.1107/S160053681400453X
PMCID: PMC3998581  PMID: 24826089
12.  Chloridotris[tris­(4-fluoro­phen­yl)phosphine]rhodium(I) methanol solvate 
In the title compound, [RhCl{P(p-FC6H4)3}3]·CH3OH, the Rh atom adopts a distorted square-planar geometry. Rh, Cl and one P atom lie on a mirror plane, as does the solvent molecule. There are two inter­molecular hydrogen bonds, one between the methanol O atom and an aryl H atom (2.51 Å), and one between the Cl atom and the hydr­oxy H atom of methanol [2.34 (3) Å]. The complex precipitates in trace amounts from a reaction between RhCl(cod)(thp) [cod is 1,5-cyclo­octa­diene and thp is tris­(hydroxy­meth­yl)phos­phine] and P(p-FC6H4)3 under argon in CD3OD. Two C6H4-F units are disordered over two positions; for one the site occupancy factors are ca. 0.53 and 0.47, for the other the values are ca. 0.64 and 0.36. The methyl H atoms of the solvent molecule are disordered across the mirror plane.
doi:10.1107/S1600536808005485
PMCID: PMC2960913  PMID: 21201983
13.  (+)-{1,2-Bis[(2R,5R)-2,5-dimethyl­phospho­lan-1-yl]ethane-κ2 P,P′}(η4-cyclo­octa-1,5-diene)rhodium(I) tetra­fluorido­borate 
The title compound, [Rh(C8H12)(C14H28P2)]BF4, exhibits a rhodium(I) complex cation with a bidentate bis­phosphine ligand and a bidentate η2,η2-coordinated cyclo­octa-1,5-diene. Together the ligands create a slightly distorted square-planar cordination environment for the Rh(I) atom. There are three mol­ecules in the asymmetric unit and intra­molecular P—Rh—P bite angles of 82.78 (5), 82.97 (6) and 83.09 (5)° are observed. The dihedral angles between the P—Rh—P and the X—Rh—X planes (X is the centroid of a double bond) are 14.7 (1), 14.8 (1) and 15.3 (1)°. The structure exhibits disorder of one cyclo­octa­diene ligand as well as one BF4 anion.
doi:10.1107/S1600536810019859
PMCID: PMC2979608  PMID: 21579351
14.  Chlorido(η4-1,5-cyclo­octa­diene)[(penta­fluoro­eth­yl)diphenyl­phosphane]iridium(I) 
The title structure,[IrCl(C8H12)(C14H10F5P)], reveals that (C2F5)PPh2 (penta­fluoro­ethyl­diphenyl­phosphane or pfepp) disrupts the iridium dimer [(cod)IrCl]2 (cod = cyclo­octa-1,5-diene) by rupturing the bridging chloride ligands and binding in the open coordination site to form (cod)Ir(pfepp)Cl with the IrI atom in a distorted square-planar coordination environment. The structure deviates very little from the IrI–triphenyl­phosphine analog, although a significantly (∼20σ) shorter Ir—P bond is noted for the title compound.
doi:10.1107/S160053681005141X
PMCID: PMC3050217  PMID: 21522590
15.  Bis(acrylonitrile-κN)dichlorido(η4-cyclo­octa-1,5-diene)ruthenium(II) 
In the title complex, [RuCl2(C8H12)(C3H3N)2], the metal ion is coordinated to centers of each of the double bonds of the cyclo­octa-1,5-diene ligand, to two chloride ions (in cis positions) and to two N-atom donors from two acrylonitrile mol­ecules that complete the coordination sphere for the neutral complex. The coordination about the RuII atom can thus be considered octa­hedral with slight trigonal distortion. The three C atoms of one of the acrylonitrile ligands are disordered over two sets of sites in a 0.581 (13):0.419 (13) ratio.
doi:10.1107/S1600536811035380
PMCID: PMC3201466  PMID: 22058687
16.  Dichlorido[(1R,2R)-N-(pyridin-2-yl­methyl)cyclo­hexane-1,2-diamine-κ3 N,N′,N′′]mercury(II) 
In the title compound, [HgCl2(C12H19N3)], the HgII ion is coordinated by three N atoms of the (1R,2R)-N-(pyridin-2-ylmeth­yl)cyclo­hexane-1,2-diamine ligand and by a Cl atom in the basal plane, and by a second Cl atom in the apical position, within a distorted square-pyramidal geometry. The coordination of the enanti­opure ligand to the metal atom renders the central N atom chiral with an S configuration, so the complex is enanti­omerically pure and corresponds to the S,R,R diastereoisomer. Mol­ecules are linked via weak N—H⋯Cl hydrogen bonds into a one-dimensional hydrogen-bonding supramolecular chain along the crystallographic b axis.
doi:10.1107/S1600536812003340
PMCID: PMC3297209  PMID: 22412399
17.  A cationic rhodium(I) N-heterocyclic carbene complex isolated as an aqua adduct 
The title complex, aqua­[1,3-bis­(2,6-diiso­propyl­phen­yl)imid­az­ol-2-yl­idene](η4-cyclo­octa-1,5-diene)rhodium(I) tetra­fluor­ido­borate, [Rh(C8H12)(C27H36N2)(H2O)]BF4, exihibits a square-planar geometry around the Rh(I) atom, formed by a bidentate cyclo­octa-1,5-diene (cod) ligand, an N-heterocylcic carbene and an aqua ligand. The complex is cationic and a BF4 − anion balances the charge. The structure exists as a hydrogen-bonded dimer in the solid state, formed via inter­actions between the aqua ligand H atoms and the BF4 − F atoms.
doi:10.1107/S1600536811033125
PMCID: PMC3200919  PMID: 22058874
18.  Dibromido[(1R,2R,N 1 S)-N-(pyridin-2-ylmeth­yl)cyclo­hexane-1,2-diamine-κ3 N,N′,N′′]cadmium 
In the title compound, [CdBr2(C12H19N3)], the CdII atom is coordinated by the three N atoms of the (1R,2R)-N-(pyridin-2-ylmeth­yl)cyclo­hexane-1,2-diamine ligand and a bromide ion in the basal plane, and by a second bromide in the apical position. The coordination environment can be described as distorted square pyramidal. The coordination of the enanti­o­pure ligand to the metal atom renders the central N atom chiral with an S configuration, so the complex is enanti­omerically pure and corresponds to the S,R,R diastereoisomer. In the crystal, the mol­ecules are linked via weak N—H⋯Br hydrogen bonds into a chain parallel to the b axis.
doi:10.1107/S1600536811007033
PMCID: PMC3099840  PMID: 21753928
19.  Chemistry of a novel zerovalent ruthenium π-acidic alkene complex, Ru (η6-1,3,5-cyclooctatriene)(η2-dimethyl fumarate)2 
A novel zerovalent ruthenium complex with a π-acidic ligand, Ru(η6-cyclooctatriene)(η2-dimethyl fumarate)2 (1), was prepared from Ru(η4-cyclooctadiene)(η6-cyclooctatriene) [Ru(cod)(cot)]. Complex 1 or Ru(cod)(cot) catalyzes various new carbon-carbon bond-forming reactions that include the [2 + 2] cycloaddition of alkenes and alkynes via ruthenacycles, the creation of a new hydrocarbon, pentacyclo[6.6.0.02,6.03,13.010,14]tetradeca-4,11-diene [PCTD], by dimerization of 2,5-norbornadiene via C-C bond cleavage, and the codimerization of alkynes and/or alkenes. Complex 1 was shown to be an excellent mother complex for various zerovalent ruthenium complexes. Complex 1 reacts with amines, phosphines or water to give new zerovalent ruthenium complexes with the ligands. The resulting aqua complexes have a water ligand with an oxygen atom that is a chiral center, i.e., ruthenium complexes with a ‘chiral water’ ligand were prepared and fully characterized.
PMCID: PMC3756878  PMID: 24019585
zerovalent ruthenium complex; [2 + 2] cycloaddition; ruthenacycle; codimerization; aqua complex; chiral water
20.  {2-[Bis(2,4-di-tert-butyl­phen­oxy)phosphan­yloxy-κP]-3,5-di-tert-butyl­phenyl-κC 1}[(1,2,5,6-η)-cyclo­octa-1,5-diene]rhodium(I) toluene monosolvate 
The reaction of (η3-all­yl)[(1,2,5,6-η)-cyclo­octa-1,5-diene]rhodium(I) with tris­(2,4-di-tert-butyl­phen­yl)phosphite in toluene produces the title compound, [Rh(C42H62O3P)(C8H12)]·C7H8, by spontaneous metallation at one of the nonsubstituted phenyl ortho-C atoms of the phosphite mol­ecule. The coordination geometry at the RhI ion is distorted square-planar. The toluene solvent mol­ecule is disordered over two different orientations, with site-occupation factors of 0.810 (2) and 0.190 (2).
doi:10.1107/S1600536812002851
PMCID: PMC3274931  PMID: 22346878
21.  ([2.2.2]Cryptand-κ6 O)potassium (η4-cyclo­octa­diene)bis­(η2-pyrene)cobaltate(1−) pentane hemisolvate  
The cation, anion, and solvent in the title compound, [K(C18H36N2O6)][Co(C8H12)(C16H10)2]·0.5C5H12, are well separated. The pentane solvent mol­ecules are found in channels along [100] and were modeled as disordered over crystallographic inversion centers. Using the mid-points of the coordinated olefins, the angle between the Cpy/Cpy–Co–Cpy/Cpy and the Ccod/Ccod–Co–Ccod/Ccod planes (py is pyrene and cod is cyclo­octa­diene) is 67.6 (2)°. Thus, the overall geometry of the coordination sphere around cobalt is best described as distorted tetra­hedral.
doi:10.1107/S1600536812029078
PMCID: PMC3393249  PMID: 22807709
22.  (μ1-Methano­lato-κ1 O)-μ1-methoxo-κ1 O-(μ2-2-amino-1-methyl-5H-imidazol-4-one-κ2 N:N′)-hexa­carbonyl­dirhenium(I) 
In the title compound, [Re2(CH3O)2(CO)6(C4H6N3O)], the two ReI atoms are linked by a methoxo and methanolato bridge, as well as by a creatinine ligand that coordinates in a bidentate fashion. Three fac-carbonyl ligands occupy the rest of the slightly distorted octa­hedral geometry around each ReI atom. The bridging methanolato and methoxo ligands are bent out of the Re2O2 plane by 49.2 (4) and 47.8 (3)° respectively. This is normally associated with a methanolato-bridging-type coordination rather that the more planar methoxo-type bridging. Furthermore, the creatinine bridging molecule is very slightly distorted from the Re2N2C plane, indicating that the pyrazolo N atom bonded to the RhI atom is not protonated. Charge balance can thus only be attained if one assumes a positional disorder for the methanolato/methoxo H atom. All attempts to locate disordered protons around these O atoms were unsuccessful. Four hydrogen bonds, one N—H⋯O and three C—H⋯O, are observed in the structure. The mol­ecules pack in a head-to-head and tail-to-tail fashion when viewed along the c axis, in alternating columns.
doi:10.1107/S1600536812041700
PMCID: PMC3515115  PMID: 23284342
23.  Synthesis, Characterization and Molecular Structures of some Bismuth(III) Complexes with Thiosemicarbazones and Dithiocarbazonic Acid Methylester Derivatives with Activity against Helicobacter Pylori 
Metal-Based Drugs  1995;2(5):271-292.
The reactions of bismuth(III) nitrate pentahydrate and bismuth(III) chloride with heterocyclic thiosemicarbazones and derivatives of dithiocarbazonic acid methylester were used to synthesize the respective bismuth(III) complexes, which could be divided into five groups D-H because of their stoichiometrical properties and their molecular structures. The molecular structure and the near coordination sphere of the bismuth(III) central atom of four representative compounds were determined by single-crystal X-ray studies. Bis[1-azepanyl-4-(2-pyridyl)-2,3-diazapenta-1,3-diene-1-thiolato-N′,N3,S]bismuth(III) nitrate (5) belongs to group D. The two tridentate ligands and the nitrate ion surround the bismuth atom. The best description of the coordination sphere appears to be that of a distorted trigonal dodecahedron with one position occupied by the lone pair of the bismuth atom. Bis[1-azepanyl-4-(2-thienyl)-2,3-diazapenta-1,3-diene-1-thiolato-N3,S]bismuth(III) nitrate (9) is assigned to complex type E. Here, two deprotonated ligand molecules are coordinated to the bismuth(III) central atom as bidentate ligands. The structure of this complex can best be described as a distorted trigonal antiprism with a five-coordinated central atom. The two triangular faces are formed by the atoms S(4), N(6), O(11) and S(3), N(4) and the lone pair of the central atom. The two chelate rings are almost perpendicular to each other. Complex molecules of group F form dimeric units with bichloro-bridged bismuth atoms. The structure of di-μ-chlorobis[1-azepanyl-4-(2-pyridyl)-2,3-diazapenta-1,3-diene-1-thiolato-N′,N3,S-chloro]dibismuth(III) (15) can be described as two six-coordinated bismuth atoms, which are bound together via two bridging chlorine atoms. The two bismuth atoms Bi(1) and Bi(1a) and the two bridging chlorine atoms Cl(2) and Cl(2a) form the Bi2Cl2 plane. The two tridentate ligand molecules coordinate via the same atoms as shown in complex 5. In addition, they form two parallel planes, which are perpendicular to the Bi2Cl2 plane. With regard to the center of the Bi(1)-Bi(2) axis they are central point symmetrical, i.e. one pyridine ring lies above and the other beneath the Bi2Cl2 plane. Bismuth(III) chloride and pyridine-2-carboxaldehydethiosemicarbazone 1 b or 2-acetylpyridine-thiosemicarbazone 1 c form complexes of group G. Three chlorine atoms and a bidentate ligand are coordinated to the bismuth(III) central atom. The bidentate ligand bound to the central atom through the N(3) atom and the sulfur atom of the thioketo group. The structure of 18 is completely different from the structures of the bismuth(III) complexes discussed so far and was therefore assigned to group H. The bismuth central atom is coordinated with two ligands, which are bound in different ways. One of them is deprotonated. This ligand is bound to the central atom via the sulfur atom S(3) of the thiolate group and the N(5) atom. An interaction between the sulfur atom of the thiophene ring and the bismuth atom is not possible.The other ligand molecule is not deprotonated. This ligand is bound to the bismuth(III) cation merely via the sulfur atom S(1) of the thioketo group. The best description of the coordination sphere of the bismuth atom is that of a distorted square bipyramidal polyhedron. The square face is formed by the atoms S(3), N(5), Cl(1), the lone pair and the bismuth atom within. The axial positions are occupied by the atoms S(1) and Cl(2). The bond angle between S(1), Bi(1) and Cl(2) differs by about eight degrees from the value determined for a regular square bipyramidal polyhedron of 180 degrees.
Some of the newly synthesized bismuth complexes and three ligands have been tested against several strains of Helicobacter pylori bacteria in an agar dilution test. Almost all of the listed bismuth complexes show excellent inhibitory properties with regard to growth of H. pylori already at low concentrations.
doi:10.1155/MBD.1995.271
PMCID: PMC2364985  PMID: 18472778
24.  Crystal structure of tetra­kis­(μ-N-phenyl­acetamidato)-κ4 N:O;κ4 O:N-bis­[(2-methyl­benzo­nitrile-κN)rhodium(II)](Rh—Rh) 
The complex molecule of the title compound, [Rh2{N(C6H5)COCH3}4(C8H7N)2], exhibits inversion symmetry. The four acetamidate ligands bridging the dirhodium core are arranged in a 2,2-trans manner with two N atoms and two O atoms coordinating to each RhII atom trans to one another. The Neq—Rh—Rh—Oeq torsion angles on the acetamidate bridge vary between −4.07 (5) and −6.78 (7)°. The axial nitrile ligands complete the distorted octa­hedral coordination sphere of each RhII atom and show a nonlinear coordination with Rh—N—C bond angles of 151.6 (3) and 152.5 (3)°. The bond lengths of the two nitrile triple bonds are 1.133 (5) and 1.137 (5) Å.
doi:10.1107/S1600536814017930
PMCID: PMC4186189  PMID: 25309187
crystal structure; RhII complex; dirhodium core; acetamidate ligand
25.  {Bis[2-(dicyclo­hexyl­phosphino)phen­yl]methyl­silyl-κ3 P,Si,P′}chloridoplatinum(II) 
In the title compound, [Pt(C37H55P2Si)Cl], prepared from MeSiH[(cy)2PC6H4]2 and [Pt(cod)Cl2] (cy = cyclo­hexyl; cod = cyclo­octa-1,5-diene), the PtII atom is coordinated by two P atoms, one Si atom and one Cl atom in a distorted square-planar geometry. The two P atoms are in a trans arrangement and the four cyclo­hexane rings adopt a chair conformation.
doi:10.1107/S1600536808028857
PMCID: PMC2959269  PMID: 21201023

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