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1.  2,2′-Diethoxy-4,4′-[(E,E)-hydrazine­diyl­idenebis(methanylylidene)]diphenol 
The complete molecule of the title compound, C18H20N2O4, is generated by inversion symmetry. The conformation around the C=N bond is E. With the exception of the eth­oxy substituent, the mol­ecule is essentially planar with an r.m.s. deviation of 0.0455 Å. In the crystal, mol­ecules are linked by O—H⋯N hydrogen bonds into a two-dimensional supra­molecular network parallel to the bc plane.
doi:10.1107/S1600536812038354
PMCID: PMC3470351  PMID: 23125764
2.  (E,E)-1,2-Bis[3-(prop-2-yn-1-yl­oxy)benzyl­idene]hydrazine 
The mol­ecule of the title compound, C20H16N2O2, is centrosymmetric, the inversion center being located at the mid-point of the central azine bond. The conformation around the C=N bond is E. The whole mol­ecule (except for the H atoms) is essentially planar, with an r.m.s. deviation of 0.07 Å. In the crystal, mol­ecules are linked head-to-tail by pairs of C—H⋯O hydrogen bonds, forming inversion dimers, and resulting in the formation of chains propagating along [011].
doi:10.1107/S1600536812025524
PMCID: PMC3393903  PMID: 22798768
3.  3-Hydr­oxy-N′-isopropyl­idene-2-naphthohydrazide 
The title Schiff base, C14H14N2O2, is close to being planar (r.m.s. deviation for the non-hydrogen atoms = 0.052 Å) and an intra­molecular N—H⋯O hydrogen bond generates an S(6) ring. In the crystal, the moleucles are linked by O—H⋯O hydrogen bonds, giving rise to helical chains propagating along the c axis of the tetra­gonal unit cell.
doi:10.1107/S1600536809050661
PMCID: PMC2971834  PMID: 21578975
4.  [N′-(5-Chloro-2-oxidobenzyl­idene-κO)-3-hydr­oxy-2-naphthohydrazidato-κ2 N′,O 2]diphenyl­tin(IV) 
The SnIV atom in the title compound, [Sn(C6H5)2(C18H11ClN2O3)], is O,N,O′-chelated by the deprotonated Schiff base ligand and further bonded by two phenyl rings in a distorted cis-C2SnNO2 trigonal-bipyramidal geometry [C—Sn—C = 125.7 (2)°]. The two phenyl rings are oriented at a dihedral angle of 55.2 (3)°. Intra­molecular O—H⋯N hydrogen bonding is present in the crystal structure.
doi:10.1107/S1600536809050107
PMCID: PMC2971880  PMID: 21578694
5.  N-(Phenyl­sulfon­yl)-l-asparagine 
In the title compound, C10H12N2O5S, one of the sulfonyl O atoms is hydrogen bonded to the amido N atom of an adjacent mol­ecule. There is also a weak hydrogen-bonding inter­action between the other sulfonyl O atom and the secondary amino N atom. In addition, the amido O atom is also hydrogen bonded to a carboxyl O atom. These hydrogen-bonding inter­actions give rise to a layer structure parallel to the bc plane.
doi:10.1107/S1600536809050247
PMCID: PMC2972182  PMID: 21578935
6.  Dichloridobis(4-chloro­benz­yl)(4,4′-dimethyl-2,2′-bipyridine-κ2 N,N′)tin(IV) 
The SnIV atom in the title compound, [Sn(C7H6Cl)2Cl2(C12H12N2)], is coordinated by the bidentate N-heterocycle mol­ecule, two chloro­benzyl anions and two Cl− anions in a distorted trans-C2SnCl2N2 octa­hedral geometry [C—Sn—C = 178.4 (1)°]. In the mol­ecular structure, the two benzene rings are oriented at a dihedral angle of 39.62 (17)°.
doi:10.1107/S1600536809049381
PMCID: PMC2971954  PMID: 21578683
7.  Bis(trimethyl­phenyl­ammonium) tetra­bromidobis(4-chloro­phen­yl)stannate(IV) 
The SnIV atom in the title salt, [N(CH3)3(C6H5)]2[SnBr4(C6H4Cl)2], exists in a distorted all-trans SnC2Br4 octa­hedral geometry. The SnIV atom lies on a center of inversion. Weak inter­molecular C—H⋯Br hydrogen bonding is observed between trimethyl­phenyl­ammonium cations and the Sn complex anion in the crystal structure.
doi:10.1107/S160053680904940X
PMCID: PMC2971998  PMID: 21578684
8.  (E,E)-1,2-Bis[4-(prop-2-yn-1-yl­oxy)benzyl­idene]hydrazine 
The mol­ecule of the title compound, C20H16N2O2, is centrosymmetric with the mid-point of the central N—N bond located on an inversion center. The configuration around the C=N bond is E. The whole mol­ecule (except for the H atoms) is approximately planar, with an r.m.s. deviation of 0.07 Å. In the crystal, the presence of weak inter­molecular C—H⋯O hydrogen bonding involving each acetyl­ene H atom and the adjacent phen­oxy O atom results in the formation of supra­molecular chains.
doi:10.1107/S160053681104102X
PMCID: PMC3247316  PMID: 22219934
9.  2-(5,6-Dihydro­benzimidazo[1,2-c]quinazolin-6-yl)-6-eth­oxy­phenol 
In the title compound, C22H19N3O2, the phenol ring forms dihedral angles of 88.93 (10) and 87.95 (12)° with the benzimidazole system and the quinazoline benzene ring, respectively. In the crystal, mol­ecules are linked via O—H⋯N hydrogen bonds into infinite chains along [100]. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring.
doi:10.1107/S1600536811034714
PMCID: PMC3200659  PMID: 22059057
10.  (E)-2-{[1-Carb­oxy-2-(1H-indol-3-yl)ethyl­iminio]meth­yl}-6-hy­droxy­phenolate 
In the zwitterionic title compound, C18H16N2O4, the dihedral angle between the planes of the benzene and indole rings is 26.38 (10)°. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked through N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds into infinite chains propagating in [010].
doi:10.1107/S1600536811031709
PMCID: PMC3200592  PMID: 22058986
11.  (E)-2-[(2,4-Dihy­droxy­benzyl­idene)aza­nium­yl]-3-(1H-indol-3-yl)propano­ate monohydrate 
In the zwitterionic title compound, C18H16N2O4·H2O, the dihedral angle between the planes of the benzene and indole rings is 39.20 (8)°. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, inter­molecular hy­droxy and water O—H⋯O(carboxyl­ate) and N+—H⋯O(carboxyl­ate) and indole N—H⋯O(water) hydrogen bonds give a three-dimensional structure.
doi:10.1107/S1600536811028200
PMCID: PMC3213555  PMID: 22091132
12.  catena-Poly[[tribenzyl­tin(IV)]-μ-(E)-3-(2-fur­yl)prop-2-enoato-κ2 O:O′] 
In the title carboxyl­ate-bridged polymer, [Sn(C7H7)3(C7H5O3)]n, the SnIV atom exists in a distorted trans-C3SnO2 trigonal–bipyramidal geometry. The polymer propagates as a chain along the a axis. There are two independent formula units in the asymmetric unit; the furyl ring of one of the anions is disordered over two positions in a 0.630 (8):0.370 (8) ratio. The crystal studied was a non-merohedral twin with a minor twin domain of 37.3 (1)%.
doi:10.1107/S1600536811023919
PMCID: PMC3151990  PMID: 21836954
13.  Bis(4-hy­droxy­benzoato-κ2 O,O′)bis­(pyridine-κN)copper(II) 
In the title compound, [Cu(C7H5O3)2(C5H5N)2], the Cu atom is located on an inversion center and is coordinated by the N atoms of the two pyridine ligands, trans to each other, and to the carboxyl­ate O atoms of two bidentate 4-hy­droxy­benzoate ligands [Cu—O = 1.9706 (10) and 2.5204 (11) Å]. Hydrogen bonding between hy­droxy H and carboxyl­ate O atoms results in a layer structure parallel to the ab plane.
doi:10.1107/S1600536811023038
PMCID: PMC3151994  PMID: 21836933
14.  Trimethyl­phenyl­ammonium μ-bromido-bis­[dibromidobis(4-bromobenzyl)stannate(IV)] 
In the title salt, [C6H5N(CH3)3][Sn2Br5(C7H6Br)4], the SnIV atoms of the dinuclear anion are bridged by a Br atom; the Sn—Brbridge bond lengths are 2.9818 (5) and 3.0470 (5) Å. Both Sn atoms show a distorted cis-trigonal–bipyramidal coordination geometry that is distorted towards a square pyramid. In the crystal, weak C—H⋯π inter­actions occur between anions and cations.
doi:10.1107/S1600536811021295
PMCID: PMC3151895  PMID: 21836868
15.  Bis(μ-methano­lato-κ2 O:O)bis­{[4-bromo-N′-(1-methyl-3-oxidobut-2-en-1-yl­idene-κO)benzohydrazidato-κ2 N′,O]oxido­vanadium(V)} 
The dinuclear compound, [V2(C12H11BrN2O2)2(CH3O)2O2], lies on a center of inversion. The doubly-deprotonated Schiff base O,N,O′-chelates to the VV atom; two metal atoms are bridged by the methoxide units. The coordination geometry is a distorted octa­hedron. Weak inter­molecular C—H⋯N hydrogen bonding is present in the crystal structure. The bromo­phenyl unit is disordered over two positions, with the major component being in a 0.909 (6) proportion.
doi:10.1107/S1600536811021647
PMCID: PMC3152071  PMID: 21836890
16.  cis-(Dimethyl sulfoxide-κO)[N′-(3-eth­oxy-2-oxidobenzyl­idene-κO)-2-hy­droxy­benzohydrazidato-κ2 N′,O]dioxido­molybdenum(VI) 
The coordination geometry at the MoVI atom in the title compound, [Mo(C16H14N2O4)O2(C2H6OS)], is distorted octa­hedral. The phenolate O, imino N, oxide O from the enolized carbonyl group and one of the terminal O atoms form the equatorial plane; the axial positions are occupied by the other terminal O atom of the dioxidomolybdenum group and the donor O atom of DMSO. The O=Mo=O angle is 105.31 (6)°. An intra­molecular O—H⋯N hydrogen bond and weak inter­molecular C—H⋯O hydrogen bonds are present in the structure.
doi:10.1107/S1600536811020290
PMCID: PMC3152017  PMID: 21836856
17.  Tribenzyl­chlorido(triphenyl­phosphine oxide-κO)tin(IV) 
In the title tribenzyl­chloridotin–triphenyl­phosphine adduct, [Sn(C7H7)3Cl(C18H15OP)], the SnIV atom is in a trans-C3SnClO trigonal–bipyramidal geometry and is displaced out of the C3Sn girdle in the direction of the axial Cl atom by 0.112 (1) in one independent mol­ecule and by 0.167 (1) Å in the other. The phenyl ring of one of the six benzyl units was refined as equally disordered over two sets of sites.
doi:10.1107/S160053681101957X
PMCID: PMC3120498  PMID: 21754684
18.  Poly[μ-aqua-aqua­{μ-6-eth­oxy-2-[(2-isonicotinoylhydrazinyl­idene)meth­yl]phenolato-κ3 O,N,O′}dioxidosodium­vanadate(V)] 
The VV atom in the polymeric title compound, [NaV(C15H13N3O3)O2(H2O)2]n, is O,N,O′-chelated by the Schiff base dianion and is five-coordinated in a trigonal–bipramidal coordination geometry. The oxide O atoms occupy the equatorial sites and one oxide O atom is connected to the NaI atom. The ligand simultaneously O,O′-chelates to the water-coordinated NaI atom; its coordination number is seven owing to an Na⋯Npyrid­yl bond. The two independent formula units, which are disposed about a false center of inversion, are connected into a layer. Adjacent layers are consolidated into a three-dimensional network by O—H⋯O and O—H⋯N hydrogen bonds.
doi:10.1107/S1600536811019106
PMCID: PMC3120385  PMID: 21754676
19.  2-{[2-(4-Chloro­phen­yl)hydrazinyl­idene]meth­yl}phenol 
In the title Schiff base mol­ecule, C13H11ClN2O, the non-H atoms are approximately coplanar (r.m.s. deviation = 0.115 Å) and the two benzene rings are twisted by 9.36 (3)° with respect to each other. The hy­droxy group is hydrogen bonded to the azomethine N atom. In the crystal, an N—H⋯π inter­action is observed between the imino group and the hy­droxy­benzene ring of an adjacent mol­ecule.
doi:10.1107/S1600536811017958
PMCID: PMC3120323  PMID: 21754826
20.  5-Chloro-2-hy­droxy­benzaldehyde 4-ethyl­thio­semicarbazone 
In the title compound, C10H12ClN3OS, the –C=N–N–C– chain bridging the ethyl­imino group and the benzene ring adopts an extended conformation with a C—N—N—C torsion angle of −171.98 (11)°. The imino H atom of the chain is a hydrogen-bond donor to the S atom of an inversion-related mol­ecule, forming a supra­molecular dimer. The hy­droxy H atom is intra­molecularly hydrogen bonded to the azomethine N atom.
doi:10.1107/S160053681101796X
PMCID: PMC3120593  PMID: 21754827
21.  [N′-(5-Chloro-2-oxidobenzyl-κO)-2,4-dihy­droxy­benzohydrazidato-κ2 N′,O](methanol-κO)dioxidomolybdenum(VI)–4,4′-bipyridine (1/1) 
In the title co-crystal, [Mo(C14H9ClN2O4)O2(CH3OH)]·C10H8N2, the deprotonated Schiff base O,N,O′-chelates to the MoVI atom, the three atoms involved in chelation comprising the fac sites of the octa­hedron surrounding the methanol-coordinated metal atom. The methanol mol­ecule forms an O—H⋯N hydrogen bond to an N atom of the 4,4′-bipyridine solvent mol­ecule; the hy­droxy group of the Schiff base forms an O—H⋯N hydrogen bond to the other N atom of another mol­ecule. The two hydrogen bonds leading to the formation of a helical chain running along the b axis.
doi:10.1107/S1600536811017259
PMCID: PMC3120353  PMID: 21754638
22.  Aqua­{6,6′-dimeth­oxy-2,2′-[ethane-1,2-diylbis(nitrilo­methyl­idyne)]diphenolato-κ4 O,N,N′,O′}(formato-κO)manganese(III) dihydrate 
The MnIII atom in the title complex, [Mn(C18H18N2O4)(CHO2)(H2O)]·2H2O, is O,N,N′,O′-chelated by the deproton­ated Schiff base; the four chelating atoms form an approximate square, with the O atoms of the water mol­ecule and the formate ion in axial positions above and below the square plane. Two metal-bearing mol­ecules are linked by an O—Hwater⋯O hydrogen bond about a center of inversion, generating a hydrogen-bonded dinuclear species; adjacent dinuclear units are linked through the lattice water mol­ecules, forming a three-dimensional network.
doi:10.1107/S1600536811017648
PMCID: PMC3120422  PMID: 21754637
23.  Aqua­[N′-(3-eth­oxy-2-oxidobenzyl-κO)furan-1-carbohydrazidato-κ2 N′,O]dioxido­molybdenum(VI)–4,4′-bipyridine (2/1) 
The MoVI atom in the title co-crystal, [Mo(C14H12N2O4)O2(H2O)]·0.5C10H8N2, is O,N,O′-chelated by the deprotonated Schiff base and coordinated by the oxide and water O atoms in an octa­hedral geometry. The five-membered chelate ring is planar (r.m.s. deviation = 0.019 Å), but the six-membered chelate ring is puckered (r.m.s. deviation = 0.108 Å). Two mononuclear mol­ecules are linked across a center of inversion by an O—Hwater⋯O hydrogen bond; adjacent dinuclear units are linked by an water–4,4′-bipyridine O—H⋯N hydrogen bond, generating a linear chain structure. The 4,4′-bipyridine mol­ecule is disordered over two positions in a 1:1 ratio.
doi:10.1107/S1600536811017260
PMCID: PMC3120460  PMID: 21754639
24.  catena-Poly[[tribenzyl­tin(IV)]-μ-(E)-3-phenyl­prop-2-enoato-κ2 O:O′] 
The SnIV atom in the title carboxyl­ate-bridged polymer, [Sn(C7H7)3(C9H7O2)]n, exists in a trans-C3SnO2 trigonal–bipyramidal geometry (average covalent Sn—O = 2.167 Å, average dative Sn—O = 2.361 Å and average O—Sn—O = 169.6°). The polymer propagates as a helical chain along the b axis with a repeat distance that is half the b-axial length. There are four independent formula units in the asymmetric unit; two are disposed about a false center of inversion with respect to the other two so that the space group emulates a centric space group.
doi:10.1107/S1600536811017247
PMCID: PMC3120586  PMID: 21754636
25.  (2,2′-Bipyridine-κ2 N,N′)dichloridobis(4-fluoro­benz­yl)tin(IV) 
The six-coordinate SnIV atom in the title compound, [Sn(C7H6F)2Cl2(C10H8N2)], shows a trans-C2SnN2Cl2 octa­hedral coordination [C—Sn—C = 174.81 (10) and 176.71 (9)° in the two independent mol­ecules in the asymmetric unit]; the Cl atoms are cis to each other as are the N atoms of the chelating N-heterocycle.
doi:10.1107/S1600536811015686
PMCID: PMC3120283  PMID: 21754570

Results 1-25 (131)