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1.  The cocrystal μ-oxalato-κ4 O 1,O 2:O 1′,O 2′-bis­(aqua­(nitrato-κO){[1-(2-pyridyl-κN)eth­ylidene]hydrazine-κN}copper(II)) μ-oxalato-κ4 O 1,O 2:O 1′,O 2′-bis­((methanol-κO)(nitrato-κO){[1-(2-pyridyl-κN)eth­ylidene]hydrazine-κN}copper(II)) (1/1) 
The title cocrystal, [Cu2(C2O4)(NO3)2(C7H9N3)2(H2O)2][Cu2(C2O4)(NO3)2(C7H9N3)2(CH4O)2], is a 1:1 cocrystal of two centrosymmetric CuII complexes with oxalate dianions and Schiff base ligands. In each mol­ecule, the CuII centre is in a distorted octa­hedral cis-CuN2O4 environment, the donor atoms of the N,N′-bidentate Schiff base ligand and the bridging O,O′-bidentate oxalate group lying in the equatorial plane. In one mol­ecule, a monodentate nitrate anion and a water mol­ecule occupy the axial sites, and in the other, a monodentate nitrate anion and a methanol mol­ecule occupy these sites. In the crystal structure, inter­molecular N—H⋯O, O—H⋯O and N—H⋯N hydrogen bonds link the mol­ecules into a network. Weak intra­molecular N—H⋯O inter­actions are also observed.
doi:10.1107/S1600536808024550
PMCID: PMC2960478  PMID: 21201585
2.  Poly[[aqua­bis(μ3-isonicotinato-κ3 O:O′:N)tris­(μ2-isonicotinato-κ3 O,O′:N)(nitrato-κO)bis­(μ4-oxalato-κ6 O 1,O 2:O 2:O 1′,O 2′:O 1′)dierbium(III)tetra­silver(I)] tetra­hydrate] 
In the title coordination polymer, {[Ag4Er2(C6H4NO2)5(C2O4)2(NO3)(H2O)]·4H2O}n, each ErIII atom is coordinated in a bicapped trigonal–prismatic coordination geometry by three O atoms from two isonicotinate (IN) ligands, four O atoms from two oxalate ligands and one O atom from either a nitrate ion or a water mol­ecule, both of which are half-occupied over the same site. One AgI atom has a Y-shaped geometry defined by one N atom from one IN ligand, one O atom from another IN ligand and one O atom from an oxalate ligand. The other AgI atom is coordinated by two IN ligands and one O atom from an oxalate ligand. One of the IN ligands is disordered over an inversion center and forms a bridge between two centrosymmetric AgI ions. Due to the disorder, this IN ligand coordinates to the Ag atom through either the pyridyl N or the carboxyl­ate O atoms. The IN and oxalate ligands link the Er and Ag atoms into a three-dimensional coordination framework. O—H⋯O and C—H⋯O hydrogen bonds are observed in the crystal structure.
doi:10.1107/S160053680901842X
PMCID: PMC2969826  PMID: 21583037
3.  Poly[aqua­(μ2-oxalato)(4-oxidopyri­din­ium)erbium(II)] 
The title complex, [Er(C5H5NO)(C2O4)(H2O)]n, is a new erbium polymer based on oxalate and 4-oxidopyridinium ligands. The ErII center is coordinated by six O atoms from three oxalate ligands, one O atom from a 4-oxidopyridinium ligand and one water mol­ecule, and displays a distorted square-anti­prismatic coordination geometry. The oxalate ligands are both chelating and bridging, and link ErII ions, forming Er–oxalate layers in which the attached water and 4-oxidopyridinium units point alternately up and down. A mirror plane passes through the Er atom, one C, the oxide O and two oxalate O atoms. The layers are assembled into a three-dimensional supra­molecular network via inter­molecular hydrogen bonding and π–π stacking inter­actions [centroid–centroid distances of 3.587 (2) Å between parallel pyridinium rings]. Both the water mol­ecule and the 4-oxidopyridinium ligand are disordered over two sites in a 1:1 ratio.
doi:10.1107/S1600536808009380
PMCID: PMC2961229  PMID: 21202197
4.  Poly[[tetra­aqua­di-μ4-oxalato-μ2-oxalato-dineo­dymium(III)] dihydrate] 
The title compound, {[Nd2(C2O4)3(H2O)4]·2H2O}n, was synthesized hydro­thermally in the presence of bis­(carb­oxy­ethyl­germanium) sesquioxide. It is isostructural with the corresponding Pr compound [Yang et al. (2009). Acta Cryst. E65, m1152–m1153]. The Nd3+ cation is nine-coordinated and its coordination polyhedron can be described as a distorted tricapped trigonal prism. Two Nd3+ ions are connected by two O atoms from two oxalate ions to give a dinuclear Nd2 unit. The unit is further linked to four others via four oxalate ions yielding a layerparallel to (0-11). The linkages between the layers by neighbouring oxalate anions lead to a three-dimensional framework with channels along the c axis. The coordinating and free water mol­ecules are located in the channels and make contact with each other and the host framework by weak O—H⋯O hydrogen bonds.
doi:10.1107/S1600536812005016
PMCID: PMC3297245  PMID: 22412435
5.  [Aqua­bis­(nitrato-κO)copper(II)]-μ-{bis­[5-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl]selenide}-[diaqua­(nitrato-κO)copper(II)] nitrate monohydrate 
In the title binuclear complex, [Cu2(NO3)3(C18H16N6Se)(H2O)3]NO3·H2O, the CuII ions are penta­coordinated in a tetra­gonal–pyramidal geometry. In both cases, the equatorial planes are formed by a chelating pyrazole-pyridine group, a water mol­ecule and a nitrate O atom, whereas the apical positions are occupied by a water mol­ecule for one CuII ion and a nitrate O atom for the other. The organic selenide ligand adopts a trans configuration with respect to the C–Se–C plane. Numerous inter­molecular O—H⋯O and N—H⋯O hydrogen bonds between the coordinating and lattice water mol­ecules, nitrate anions and pyrazole groups are observed. π–π stacking inter­actions between the pyridine rings [averaged centroid–centroid distance = 3.652 (5) Å] are also present. The lattice water molecule is equally disordered over two sets of sites.
doi:10.1107/S1600536812045217
PMCID: PMC3588734  PMID: 23468699
6.  [Di­aqua­sesqui(nitrato-κO)hemi(perchlorato-κO)copper(II)]-μ-{bis­[5-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide}-[tri­aqua­(perchlorato-κO)copper(II)] nitrate monohydrate 
In the binuclear title complex, [Cu2(ClO4)1.5(NO3)1.5(C18H16N6Se)(H2O)5]NO3·H2O, both CuII ions are hexa­coordinated by O and N atoms, thus forming axially elongated CuO4N2 octa­hedra. The equatorial plane of each octa­hedron is formed by one chelating pyrazole–pyridine fragment of the organic ligand and two water mol­ecules. The axial positions in one octa­hedron are occupied by a water mol­ecule and a monodentately coordinated perchlorate anion, while those in the other are occupied by a nitrate anion and a disordered perchlorate/nitrate anion with equal site occupancy. The pyrazole–pyridine units of the organic selenide are trans-oriented to each other with a C—Se—C angle of 96.01 (14)°. In the crystal, uncoordinated nitrate anions and the coordinating water mol­ecules are involved in O—H⋯O and N—H⋯O hydrogen bonds, forming a bridge between the pyrazole group and the coordinating water mol­ecules. Further O—H⋯O hydrogen bonds between the complex mol­ecules and a π–π stacking inter­action with a centroid–centroid distance of 3.834 (4) Å are also observed.
doi:10.1107/S1600536813012178
PMCID: PMC3684879  PMID: 23794981
7.  Poly[[aqua­(μ2-oxalato)(μ2-2-oxido­pyridinium-3-carboxylato)holmium(III)] monohydrate] 
In the title complex, {[Ho(C2O4)(C6H4NO3)(H2O)]·(H2O)}n, the HoIII ion is coordinated by three O atoms from two 2-oxidopyridinium-3-carboxylate ligands, four O atoms from two oxalate ligands and one water mol­ecule in a distorted bicapped trigonal-prismatic geometry. The 2-oxidopyridin­ium-3-carboxylate and oxalate ligands link the HoIII ions into a layer in (100). These layers are further connected by inter­molecular O—H⋯O hydrogen bonds involving the coordinated water mol­ecules to assemble a three-dimensional supra­molecular network. The uncoordin­ated water mol­ecule is involved in N—H⋯O and O—H⋯O hydrogen bonds within the layer.
doi:10.1107/S1600536809036344
PMCID: PMC2970271  PMID: 21577741
8.  Poly[[aqua­(μ2-oxalato)(μ2-2-oxido­pyridinium-3-carboxylato)dysprosium(III)] monohydrate] 
In the title complex, {[Dy(C6H4NO3)(C2O4)(H2O)]·H2O}n, the DyIII ion is coordinated by seven O atoms from two 2-oxidopyridinium-3-carboxylate ligands, two oxalate ligands and one water mol­ecule, displaying a distorted bicapped trigonal-prismatic geometry. The carboxyl­ate groups of the 2-oxidopyridinium-3-carboxylate and oxalate ligands link dysprosium metal centres, forming layers parallel to (100). These layers are further connected by inter­molecular O—H⋯O hydrogen-bonding inter­actions involving the coordin­ated water mol­ecules, forming a three-dimensional supra­molecular network. The uncoordinated water mol­ecule is involved in N—H⋯O and O—H⋯O hydrogen-bonding inter­actions within the layer.
doi:10.1107/S1600536809000580
PMCID: PMC2968133  PMID: 21581782
9.  μ-Oxalato-κ4 O 1,O 2:O 1′,O 2′-bis­[diaqua­(2,2′-bipyridyl-κ2 N,N′)zinc] bis­[2-(1H-benzotriazol-1-yl)acetate] hexa­hydrate 
The asymmetric unit of the title compound, [Zn2(C2O4)(C10H8N2)2(H2O)4](C8H6N3O2)2·6H2O, contains one half of the centrosymmetric binuclear cation, one anion and three water mol­ecules. In the cation, the oxalate ligand bridges two ZnII ions in a bis-bidentate fashion, so each ZnII ion is coordinated by two O atoms from the oxalate ligand, two N atoms from two 2,2′-bipyridine ligands and two water mol­ecules in a distorted octa­hedral arrangement. The mean planes of the oxalate and 2,2′-bipyridine ligands form a dihedral angle of 80.0 (1)°. An extensive three-dimensional hydrogen-bonding network formed by classical O—H⋯O and O—H⋯N inter­actions consolidates the crystal packing.
doi:10.1107/S1600536812001778
PMCID: PMC3274917  PMID: 22346864
10.  Bis(dicyclo­hexyl­ammonium) μ-oxalato-κ4 O 1,O 2:O 1′,O 2′-bis­[aqua­(oxalato-κ2 O 1,O 2)diphenyl­stannate(IV)] 
The structure of the title compound, (C12H24N)2[Sn2(C6H5)4(C2O4)3(H2O)2], consists of a bischelating oxalate ion, located on an inversion center, which is linked to two SnPh2 groups. The coordination sphere of the Sn(IV) ion is completed by a monochelating oxalate anion and a water mol­ecule. The Sn(IV) atoms are thus seven-coordinated. The discrete binuclear units are further connected by hydrogen bonds, leading to a supra­molecular crystal structure. The asymmetric unit contains one half dianion and one (Cy2NH2)+ cation.
doi:10.1107/S1600536810046738
PMCID: PMC3011489  PMID: 21589314
11.  Aqua­bis(3,5-dimethyl-1H-pyrazole-κN)(oxalato-κ2 O,O′)copper(II) 
In the title compound, [Cu(C2O4)(C5H8N2)2(H2O)], the CuII atom is coordinated in a slightly distorted square-pyramidal geometry by two N atoms belonging to the two 3,5-dimethyl-1H-pyrazole ligands, two O atoms of the oxalate anion providing an O,O′-chelating coordination mode, and an O atom of the water mol­ecule occupying the apical position. The crystal packing shows a well defined layer structure. Intra-layer connections are realised through a system of hydrogen bonds while the nature of the inter-layer inter­actions is completely hydro­phobic, including no hydrogen-bonding inter­actions.
doi:10.1107/S1600536807058928
PMCID: PMC2914925  PMID: 21200611
12.  Poly[di-μ-aqua-di­aqua­bis­(μ7-oxalato-κ9 O 1:O 1:O 1,O 2:O 2:O 2′:O 2′,O 1′:O 1′)calciumdicaesium] 
In the title compound, [CaCs2(C2O4)2(H2O)4]n, the Ca2+ ion, lying on a twofold rotation axis, is coordinated by four O atoms from two oxalate ligands and two bridging water mol­ecules in an octa­hedral geometry. The Cs+ ion is coordinated by seven O atoms from six oxalate ligands, one bridging water and one terminal water mol­ecule. The oxalate ligand displays a scarce high denticity. The structure contains parallel chain units runnig along [10-1], formed by two edge-sharing Cs polyhedra connected by CsO9 polyhedra connected by a face-sharing CaO6 octahedron. These chains are further linked by the oxalate ligands to build up a three-dimensional framework. O—H⋯O hydrogen bonds involving the water mol­ecules and the carboxyl­ate O atoms enhance the extended structure.
doi:10.1107/S1600536813022654
PMCID: PMC3884383  PMID: 24426991
13.  Poly[tetra­aqua­bis­(μ3-oxalato-κ5 O 1,O 2:O 1′:O 1′,O 2′)(μ2-oxalato-κ4 O 1,O 2:O 1′,O 2′)dipraseodymium(III)] 
In the title complex, [Pr2(C2O4)3(H2O)4]n, the two independent PrIII ions are both nine-coordinated in a distorted monocapped square-anti­prismatic geometry by seven O atoms from four oxalate ligands and two water mol­ecules. The PrIII ions are bridged by the oxalate ligands, forming a layer parallel to (001). O—H⋯O hydrogen bonds connect the layers.
doi:10.1107/S1600536812011014
PMCID: PMC3343842  PMID: 22589816
14.  Poly[tetra­aqua­(5-hy­droxy­pyridin-1-ium-3-carboxyl­ato-κO 3)tris­(μ-oxalato-κ4 O 1,O 2:O 1′,O 2′)dieuropium(III)] 
In the title compound, [Eu2(C6H5NO3)2(C2O4)3(H2O)4]n, the EuIII atom is bonded to one O atom from a monodentate 5-hy­droxy­pyridin-1-ium-3-carboxyl­ate ligand, six O atoms from three oxalate ligands and two water mol­ecules, exhibiting a highly distorted tricapped trigonal geometry. Three independent oxalate ligands, each lying on an inversion center, bridge the EuIII atoms, forming a brickwall-like layer parallel to (001), which is stabilized by intra­layer O—H⋯O hydrogen bonds. The layers are further linked through inter­layer O—H⋯O and N—H⋯O hydrogen bonds and π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.5741 (14) Å] into a three-dimensional supra­molecular network.
doi:10.1107/S1600536813011057
PMCID: PMC3647824  PMID: 23723790
15.  Poly[[tetra­aquadi-μ4-fumarato-μ2-oxalato-dierbium(III)] tetra­hydrate] 
The title compound, {[Er2(C4H2O4)2(C2O4)(H2O)4]·4H2O}n, was synthesized by the reaction of erbium nitrate hexa­hydrate with fumaric acid and oxalic acid under hydro­thermal conditions. The Er3+ cation (site symmetry ..2) is eight-coordinated by six O atoms from four fumarate anions (site symmetry ..2) and one bidentate oxalate anion (site symmetry 222), and by two water mol­ecules. The complex exhibits a three-dimensional structure consisting of oxalate pillared Er–fumarate layers with channels occupied by coordinating and lattice water mol­ecules. The three-dimensional structure features by Owater—H⋯O hydrogen bonds involving both the coordinating and lattice water mol­ecules.
doi:10.1107/S160053681205026X
PMCID: PMC3588352  PMID: 23476347
16.  catena-Poly[[tetra-μ3-isonicotinato-μ3-oxalato-μ2-oxalato-disamarium(III)disilver(I)] dihydrate] 
In the title compound, {[AgSm(C6H4NO2)2(C2O4)]·H2O}n, the asymmetric unit contains one SmIII ion, one AgI ion, two unique isonicotinate (ina) ligands, two half oxalate (ox) ligands (one on an inversion centre, the other on a twofold axis) and one uncoordinated water mol­ecule. The central SmIII ion is nine-coordinated by four O-donor atoms from separate bidentate bridging ox ligands and five O-donor atoms from the two ina ligands (both bidentate) and a symmetry-related ina ligand [Sm—O = 2.389 (4)–2.791 (4) Å], giving a distorted monocapped square anti­prismatic geometry. The AgI ion is three-coordinated in a T-shaped geometry involving two ina N-donor atoms [Ag—N = 2.181 (6) and 2.185 (5) Å] and a bridging oxalate O-donor atom [Ag—O = 2.620 (4) Å]. The three-dimensional heterometallic Sm—Ag coordination polymer, having a unique (3,4,6)-connected five-nodal net topology, is constructed from two-dimensional samarium–oxalate layers and pillared Ag(ina)2 subunits. Inter­molecular water–carboxyl­ate O—H⋯O hydrogen-bonding inter­actions are also present.
doi:10.1107/S1600536809054208
PMCID: PMC2980152  PMID: 21579979
17.  catena-Poly[[aqua­(3-methyl­benzoato-κ2 O,O′)lead(II)]-μ-3-methyl­benzoato-κ4 O:O,O′:O′] 
The reaction of lead(II) acetate and 3-methyl­benzoic acid (MBA) in aqueous solution yielded the title polymer, [Pb(C8H7O2)2(H2O)]n. The asymmetric unit contains two PbII atoms, four MBA ligands and two water mol­ecules. Each PbII cation is hepta­coordinated and chelated by four carboxyl­ate O atoms from two MBA ligands. The Pb atoms are bridged through the carboxyl­ate O atoms from another two MBA ligands, leading to a central Pb2O2 core. The Pb—O bond lengths are in the range 2.325 (3)–2.757 (4) Å. The intra- and inter­dimer Pb⋯Pb distances are 4.2942 (3) and 4.2283 (3) Å, respectively, indicating little direct metal–metal inter­action. The coordinating water mol­ecules and carboxyl­ate O atoms are involved in extensive O—H⋯O hydrogen-bonding inter­actions. The complex has an extended ladder-like chain structure and the chains are assembled by hydrogen bonds and π–π inter­actions [centroid–centroid distance = 3.6246 (3) Å] into a three-dimensional supra­molecular structure.
doi:10.1107/S1600536809019771
PMCID: PMC2969469  PMID: 21582655
18.  Poly[diaqua-μ2-isonicotinato-μ2-oxalato-terbium(III)] 
In the crystal structure of the title complex, [Tb(C6H4NO2)(C2O4)(H2O)2]n, the TbIII cation is coordinated by four O atoms from two oxalate ligands, two O atoms from two isonicotinate ligands and two O atoms from water mol­ecules within a distorted square–anti­prismatic coordination. The TbIII cation, the isonicotinate anion and the two crystallographically independent water mol­ecules occupy general positions, whereas one of the two crystallographically independent oxalate anions is located on a center of inversion, and the second oxalate anion is located on a twofold rotation axis. The TbIII cations are linked by the oxalate and isonicotinate anions into layers, which are connected via inter­molecular hydrogen-bonding and π–π stacking [with centroid-to-centroid distances of 3.509 (2) and 3.343 (3) Å] inter­actions into a three-dimensional network.
doi:10.1107/S1600536808040518
PMCID: PMC2968018  PMID: 21581481
19.  Poly[di-μ2-aqua-μ2-(5-methyl­pyrazine-2-carboxyl­ato)-(5-methyl­pyrazine-2-carboxyl­ato)-μ3-nitrato-trilithium] 
The asymmetric unit of the title compound, [Li3(C6H5N2O2)2(NO3)(H2O)2]n contains three LiI ions, two ligand anions, two water mol­ecules and a nitrate anion. Related by a centre of inversion, they form a centrosymmetric mol­ecular cluster in which one of the LiI ions shows trigonal–bipyramidal and the other two distorted tetra­hedral coordination. LiI ions are bridged by water O atoms and carboxyl­ate O atoms donated by one of the ligands. The clusters, bridged by two nitrato O atoms, form mol­ecular columns along [010], which are held together by O—H⋯O and O—H⋯N hydrogen bonds and π–π inter­actions [centroid–centroid distances = 3.694 (1) and 3.796 (1) Å].
doi:10.1107/S1600536811024548
PMCID: PMC3152134  PMID: 21836828
20.  Poly[[hexa­aqua­(μ2-oxalato-κ4 O 1,O 2:O 1′,O 2′)bis(μ3-pyridine-2,4-dicarboxyl­ato-κ4 N,O 1:O 1′:O 4)dicerium(III)] monohydrate] 
In the polymeric title compound, {[Ce2(C7H3NO4)2(C2O4)(H2O)6]·H2O}n, the Ce3+ cation is nine-coordinated in a distorted CeNO8 tricapped trigonal–prismatic geometry, formed by three pyridine-2,4-dicarboxyl­ate anions, one oxalate anion and three water mol­ecules. The mid-point of the oxalate anion is located on an inversion center. The oxalate and pyridine-2,4-dicarboxyl­ate anions bridge the Ce3+ cations, forming a two-dimensional polymeric complex parallel to (010). Inter­molecular classical O—H⋯O hydrogen bonding and weak C—H⋯O hydrogen bonding are present in the crystal structure and π–π stacking [centroid–centroid distance = 3.558 (2) Å] is observed between parallel pyridine rings of adjacent mol­ecules. The uncoordinated water mol­ecule shows an occupancy of 0.5.
doi:10.1107/S1600536811051956
PMCID: PMC3254299  PMID: 22259328
21.  Bis(2-amino­pyrimidine-κN 1)aqua­(nitrato-κO)(nitrato-κ2 O,O′)zinc(II) 
The water-coordinated Zn atom in the title monoaqua zinc nitrate adduct of 2-amino­pyrimidine, [Zn(NO3)2(C4H5N3)2(H2O)], is bonded to a monodentate nitrate ion and is chelated by the other nitrate ion. The heterocyclic ligands coordinate through ring N-donor sites. The coordination geometry about the Zn(II) atom is a distorted octa­hedron. Intra­molecular N—H⋯O hydrogen bonds occur. In the crystal, adjacent adduct mol­ecules are linked by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds into a layer motif parallel to (001).
doi:10.1107/S1600536810036731
PMCID: PMC2983322  PMID: 21587423
22.  Poly[[hexa­aqua­(μ2-oxalato-κ4 O 1,O 2:O 1′,O 2′)bis­(μ3-pyridine-2,4-dicarboxyl­ato-κ4 N,O 2:O 2′:O 4)dilanthanum(III)] monohydrate] 
In the polymeric title compound, {[La2(C7H3NO4)2(C2O4)(H2O)6]·H2O}n, the La3+ cation is nine-coordinated in a distorted LaNO8 tricapped trigonal–prismatic geometry formed by three pyridinedicarboxylate anions, one oxalate anion and three water mol­ecules. The oxalate anion is located on an inversion center. The oxalate and pyridine­dicarboxyl­ate anions bridge the La3+ cations, forming a two-dimensional polymeric complex parallel to (010). Inter­molecular O—H⋯O hydrogen bonding and weak C—H⋯O hydrogen bonding is present in the crystal structure and π–π stacking [centroid–centroid distance = 3.571 (3) Å] is observed between parallel pyridine rings of adjacent mol­ecules. The uncoordinated water molecule shows an occupancy of 0.5.
doi:10.1107/S160053681104668X
PMCID: PMC3238643  PMID: 22199534
23.  Di-μ-benzoato-κ3 O,O′:O;κ3 O:O,O′-bis­[aqua­(nitrato-κO)(1,10-phenanthroline-κ2 N,N′)lead(II)] 
The title compound, [Pb2(C7H5O2)2(NO3)2(C12H8N2)2(H2O)2], crystallizes as a dinuclear centrosymmetric dimer containing two PbII atoms bridged by two benzoate ligands. Each PbII atom is seven-coordinated by a water mol­ecule, a nitrate anion, a 1,10-phenanthroline (phen) ligand and two benzoate anions. The crystal packing is stabilized by O—H⋯O hydrogen bonds and by π–π stacking between neighboring phen ligands, with a centroid–centroid distance of 3.557 (3) Å.
doi:10.1107/S1600536812012974
PMCID: PMC3343907  PMID: 22589875
24.  Poly[aqua(μ3-5-aza­niumylisophthalato)­(μ-oxalato)neodymium(III)] 
The title compound, [Nd(C8H6NO4)(C2O4)(H2O)]n, is a layer-like coordination polymer. The NdIII ion is coordinated by four carboxyl­ate O atoms from three bridging 5-aza­nium­yl­isophthalate (Haip) ligands, four carboxyl­ate O atoms from two oxalate (ox) anions and one ligated water mol­ecule in a tricapped trigonal–prismatic geometry. The Haip anion acts as a μ3-bridge, connecting three NdIII ions through two carboxyl­ate groups; the ox anion adopts a bis-bidentate-bridging mode, linking two NdIII ions. The layer framework is further extended to a three-dimensional supra­molecular structure through N—H⋯O and O—H⋯O hydrogen bonds.
doi:10.1107/S1600536812013554
PMCID: PMC3344297  PMID: 22590063
25.  Poly[aqua­hemi(μ4-oxalato)[μ3-5-(pyrazin-2-yl)tetra­zolato]cadmium(II)] 
In the title polymeric complex, [Cd(C5H3N6)(C2O4)0.5(H2O)]n, the CdII ion is coordinated by four O atoms and three N atoms from two 5-(pyrazin-2-yl)tetra­zolate ligands, two oxalate ligands and one water mol­ecule, displaying a distorted monocapped octa­hedral geometry. The bridging ligands link metal centres, forming a three-dimensional network which is stabilized by inter­molecular O—H⋯N hydrogen-bonding inter­actions.
doi:10.1107/S1600536810027406
PMCID: PMC3007478  PMID: 21588175

Results 1-25 (248848)