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Poly[[diaqua-(?(4)-l-tartrato)(?(2)-l-tartrato)dizinc(II)] tetra-hydrate].

ABSTRACT: In the title compound, {[Zn(C(4)H(4)O(6))(H(2)O)]·2H(2)O}(n), the l-tartrate ligands adopt ?(4)- and ?(2)-coordination modes. The Zn(II) atom adopts an octa-hedral geometry and is chelated by two kinds of l-tartrate ligands through the hydr-oxy and carboxyl-ate groups and coordinated by one unchelating carboxyl-ate O atom and one water mol-ecule. In the crystal, the l-tartrate ligands link the Zn(II) atoms, forming a two-dimensional coordination layer; these layers are futher linked into a three-dimensional supra-molecular network by O-H?O hydrogen bonds between the two-dimensional coordin-ation layers and the uncoordinated water mol-ecules. The latter are equally disordered over two positions.

SUBMITTER: Liu HT

PROVIDER: S-EPMC2983975 | BioStudies | 2010-01-01T00:00:00Z

REPOSITORIES: biostudies

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Poly[[?(4)-tartrato-cadmium(II)] 0.167-hydrate].

Project description:The title compound, {[Cd(C(4)H(4)O(6))]·0.167H(2)O}(n), adopts a three-dimensional network structure in which each Cd(II) ion is chelated by two pairs of carboxyl-ate and hydroxyl O atoms from two tartrate anions, and is additionally linked to two O atoms of two carboxyl-ate groups that are not involved in chelation. The asymmetric unit has four independent cadmium atoms, two of which lie on special positions of 2 site symmetry. The tartrate anions all lie on general positions. All hydroxyl groups are engaged in O-H?O hydrogen-bonds, one of which is also bifurcated. The non-coordinating water molecule is situated on a site with half-occupation.

1000-01-01 | S-EPMC2969599 | BioStudies

Crystal structure of poly[bis-(?-nicotinamide-?(2) N (1):O)bis-(?-4-nitro-benzoato-?(2) O (1):O (1'))zinc].

Project description:The asymmetric unit of the title coordination polymer, [Zn(C7H4NO4)2(C6H6N2O)2] n , contains two 4-nitro-benzoate (NB) anions and two nicotinamide (NA) ligands. The Zn(II) atom has a slightly distorted octa-hedral coordination sphere. In the equatorial plane, it is coordinated by three carboxyl-ate O atoms of the NB anions and one O atom of one of the two NA ligands. The axial positions are occupied by the pyridine N atoms of the two NA ligands. In the two NB anions, the carboxyl-ate groups are twisted away from the attached benzene rings by 13.8?(2) and 13.4?(2)°, while the benzene rings are oriented at a dihedral angle of 11.5?(2)°. The dihedral angle between the NA rings is 10.3?(1)°. Only one of the two NB anions and one of the two NA ligands bridge adjacent Zn(II) ions through eight- and twelve-membered rings, respectively, forming polymeric chains running along the a-axis direction. In the crystal, N-H ? O hydrogen bonds link adjacent chains, enclosing R(16), R 2 (2)(20) and R 6 (6)(16) ring motifs, forming layers parallel to (01-1). The layers are linked via a number of C-H?O hydrogen bonds, forming a three-dimensional network.

2015-01-01 | S-EPMC4420036 | BioStudies

Poly[triaqua-[?(4)-3-(4-carboxyl-atophen-oxy)propionato-?O:O':O'':O'''][?(3)-3-(4-carboxyl-atophen-oxy)propionato-?O:O':O'']dizinc].

Project description:The coordination polymer [Zn(2)(C(10)H(8)O(5))(2)(H(2)O)(3)](n) adopts a layer structure in which the two independent Zn(II) ions exist in trigonal-bipyramidal coordination geometries. One carboxyl-ate dianion binds to a monoaqua-coordinated metal ion through the aliphatic carboxyl-ate end and to the diaqua-coordinated metal ion through the aromatic carboxyl-ate end; the other dianion binds in the reverse manner. Three of the four carboxyl-ate ends of the two dianions are also engaged in bridging inter-actions; these lead to a layer structure parallel to (100). Adjacent layers are linked by O-H(water)?O hydrogen bonds into a three-dimensional network.

1000-01-01 | S-EPMC3274937 | BioStudies

Poly[[triaqua-[?(4)-N-(4-carboxyl-ato-phenyl)-iminodiacetato]sodium(I)zinc(II)] dihydrate].

Project description:In the title coordination polymer, {[NaZn(C(11)H(8)NO(6))(H(2)O)(3)]·2H(2)O}(n), the Zn atom is coordinated in a distorted tetra-hedral environment by three carboxyl-ate O atoms from two (4-carboxyl-atophenyl-imino)diacetate ligands and one water mol-ecule; the Na atom is in an distorted octa-hedral coordination environment formed by four carboxyl-ate O atoms from three (4-carboxyl-atophenyl-imino)diacetate ligands and two water mol-ecules. The Zn atoms and Na atoms are linked by (4-carboxyl-atophenyl-imino)diacetate ligands into a three-dimensional framework; the uncoordinated water mol-ecules fill the voids of the skeleton and stabilize it by O-H?O hydrogen bonds.

1000-01-01 | S-EPMC2959866 | BioStudies

catena-Poly[[octa-aqua-bis-(?(4)-benzene-1,3,5-tricarboxyl-ato)trizinc] tetra-hydrate].

Project description:In the title compound, {[Zn(3)(C(9)H(3)O(6))(2)(H(2)O)(8)]·4H(2)O}(n), there are two crystallographically independent Zn(II) ions. One presents a trigonal-bipyramidal coordination geometry defined by five O atoms [three from two carboxyl-ate groups of two benzene-1,3,5-tricarboxyl-ate (BTC) ligands and the other two deriving from three water mol-ecules], while the other lies on an inversion centre and exists in a slightly distorted octa-hedral coordination geometry defined by six O atoms (two from two carboxyl-ate groups of two BTC ligands and the others from four water mol-ecules). A three-dimensional framework is further strengthened via O-H?O hydrogen-bonding inter-actons.

1000-01-01 | S-EPMC3089220 | BioStudies

Poly[[[?(2)-1,1'-(butane-1,4-di-yl)bis-(1H-imidazole)-?N:N](?(2)-2,6-di-methyl-pyridine-3,5-dicarboxyl-ato-?O:O)zinc] dihydrate].

Project description:In the title coordination polymer, {[Zn(C(9)H(7)NO(4))(C(10)H(14)N(4))]·2H(2)O}(n), the Zn(II) ion displays a distorted tetra-hedral geometry with two imidazole N atoms from two 1,1'-(butane-1,4-di-yl)bis-(imidazole) (bbi) ligands and two carboxyl-ate O atoms from two 2,6-dimethyl-pyridine-3,5-dicarboxyl-ate (dpdc) ligands. The bbi and dpdc ligands bridge the Zn(II) ions, forming layers parallel to (011). O-H?O and O-H?N hydrogen bonds and ?-? inter-actions between the imidazole rings [centroid-centroid distance = 3.807?(5)?Å] connect the layers. Two of the three uncoordinated water mol-ecules are disordered, each over two 0.25-occupancy positions.

2011-01-01 | S-EPMC3201321 | BioStudies

(Acetato-?O)(acetato-?²O,O')[2-(3,5-di-methyl-1H-pyrazol-1-yl-?N²)quinoline-?N]zinc(II).

Project description:The Zn(II) atom in the title compound, [Zn(C?H?O?)?(C??H??N?)], is coordinated by an N?O? donor set defined by the quinolinyl- and pyrazolyl-N atoms of the chelating heterocyclic ligand, and three carboxyl-ate-O atoms derived from the monodentate and bidentate carboxyl-ate ligands. Distortions from the ideal square-pyramidal coordination geometry relate to the restricted bite angle of the chelating ligands, i.e. O-Zn-O = 59.65?(5) and N-Zn-N = 76.50?(6)°, and the close approach of the non-coordinating carbonyl atom [Zn?O = 2.858?(2)?Å]. In the crystal, mol-ecules are consolidated into a three-dimensional architecture by C-H?O inter-actions.

2012-01-01 | S-EPMC3393171 | BioStudies

Poly[(?(3)-5-bromo-nicotinato)(5-bromo-nicotinato)copper(II)].

Project description:The title coordination polymer, [Cu(C(6)H(3)BrNO(2))(2)](n), is composed of two structurally similar two-dimensional coordination polymers (twin layers). Both of them have the same chemical composition but they display different bond lengths and angles. In each layer, two N atoms and four carboxyl-ate O atoms from the bridging 5-bromo-nicotinate ligands and four carboxyl-ate O atoms from the terminal 5-bromo-nicotinate ligands bind to two Cu(II) atoms to form a dinuclear paddle-wheel-like pattern. Adjacent paddle wheels are further linked by bridging 5-bromo-nicotinate groups to generate a two-dimensional coordination polymer; neighboring twin-like layers are finally stacked through ?-? stacking interactions between adjacent pyridine rings [perpendicular distance of 3.626?(2)?Å] in a 'sandwich' manner, thus generating a three-dimensional supra-molecular structure.

1000-01-01 | S-EPMC2970337 | BioStudies

Poly[(?(2)-4,4'-bipyridine-?N:N')bis-(?(4)-cyclo-hexane-1,3-dicarboxyl-ato-?O:O':O'':O''')dizinc(II)].

Project description:The cyclo-hexane-1,3-dicarboxyl-ate dianion in the title three-dimensional coordination polymer, [Zn(2)(C(8)H(10)O(4))(2)(C(10)H(8)N(2))](n), has one carboxyl-ate group in an equatorial position and the other in an axial position of the cyclo-hexane ring, which adopts a chair conformation. The carboxyl-ate groups function as bridges to two adjacent Zn(II) atoms, generating a layer motif. Adjacent layers are linked through the 4,4'-bipyridine N-heterocycle, forming a three-dimensional network; the geometry of Zn(II) is square-pyramidal with the N atom of the N-heterocycle occupying the apical position. The N-heterocycle lies about a center of inversion and is disordered in a 1:1 ratio with respect to the C atoms bearing H atoms.

2009-01-01 | S-EPMC2970416 | BioStudies

catena-Poly[[diaquazinc(II)]-?-trans-4,4'-diazenediyldibenzoato-?O,O':O'',O'''].

Project description:The title compound, [Zn(C(14)H(8)N(2)O(4))(H(2)O)(2)](n), consists of zigzag chains of Zn atoms bridged by azobenzene-4,4'-dicarboxyl-ate ligands. The Zn(II) atom, lying on a twofold rotation axis, is coordinated by four O atoms from the carboxyl-ate groups and two water mol-ecules, giving rise to a considerably distorted octa-hedral coordination envionment. The ligand lies on an inversion center. In the crystal structure, ?-? inter-actions between the ligands [inter-planar distance = 3.527?(3)?Å] assemble the chains into a sheet-like structure. O-H?O hydrogen bonds between the coordinated water mol-ecules and carboxyl-ate O atoms connect the sheets into a three-dimensional network.

1000-01-01 | S-EPMC2977570 | BioStudies

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