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Catena-Poly[[[aqua-(pyrazine-2-carboxamide-?(2)N(1),O)zinc]-?-pyrazine-2-carboxamide-?(3)N(1),O:N(4)] dinitrate].

ABSTRACT: In the crystal of the title compound, {[Zn(C(5)H(5)N(3)O)(2)(H(2)O)](NO(3))(2)}(n), the Zn(II) cation is N,O-chelated by two pyrazine-2-carboxamide (PCA) ligands and is further coordinated by one water mol-ecule and by one pyrazine-N atom from an adjacent PCA ligand in a distorted ZnN(3)O(3) octa-hedral geometry. One of the two independent PCA ligands bridges two Zn(II) cations, forming a zigzag polymeric chain running along the c axis. In the crystal, the NO(3) (-) anions link to the chain via O-H?O and N-H?O hydrogen bonding. Weak inter-molecular C-H?O inter-actions also occur.

SUBMITTER: Shirvan SA

PROVIDER: S-EPMC3344359 | biostudies-other | 2012 May

REPOSITORIES: biostudies-other

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catena-Poly[[[aqua-(pyrazine-2-carboxamide-κ(2)N(1),O)zinc]-μ-pyrazine-2-carboxamide-κ(3)N(1),O:N(4)] dinitrate].

Shirvan Sadif A SA Haydari Dezfuli Sara S

Acta crystallographica. Section E, Structure reports online 20120418 Pt 5

In the crystal of the title compound, {[Zn(C(5)H(5)N(3)O)(2)(H(2)O)](NO(3))(2)}(n), the Zn(II) cation is N,O-chelated by two pyrazine-2-carboxamide (PCA) ligands and is further coordinated by one water mol-ecule and by one pyrazine-N atom from an adjacent PCA ligand in a distorted ZnN(3)O(3) octa-hedral geometry. One of the two independent PCA ligands bridges two Zn(II) cations, forming a zigzag polymeric chain running along the c axis. In the crystal, the NO(3) (-) anions link to the chain via ...[more]

PMID: 22590125

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catena-Poly[[(pyrazine-2-carboxamide-?N (4))copper(I)]-?3-iodido].

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Project description:In the crystal of the title polymeric compound, [Cu(2)(SO(4))(2)(C(5)H(5)N(3)O)(2)(H(2)O)(4)](n), two independent Cu(II) atoms are located on individual inversion centers. One Cu(II) atom is coordinated by four water mol-ecules and two pyrazine-2-carboxamide ligands in a distorted O(4)N(2) octa-hedral geometry; the other is N,O-chelated by two pyrazine-2-carboxamide ligands and further coordinated by two sulfate anions in a distorted O(4)N(2) octa-hedral geometry. The pyrazine-2-carboxamide ligands bridge the Cu(II) atoms to form a polymeric chain running along [110]. The crystal structure features N-H?O, O-H?O and weak C-H?O hydrogen bonds.

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Project description:In the title compound, {[Ni(C(12)H(10)N(2))(H(2)O)(4)](NO(3))(2)}(n), the Ni(II) ion, lying on a crystallographic inversion center, has a distorted octa-hedral coordination sphere comprising four water ligands and two N-atom donors from the trans-related 1,2-bis-(4-pyrid-yl)ethene ligands, which also have crystallographic inversion symmetry. These ligands bridge the Ni(II) complex units, forming chains extending along the [110] and [[Formula: see text]10] directions. The nitrate counter-anions stabilize the crystal structure through water-nitrate O-H?O hydrogen bonds.

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A new polymorph of catena-poly[[tri-aqua-cadmium(II)]-?(2)-pyrazine-2,3-dicarboxyl-ato].

Project description:The title complex, [Cd(C(6)H(2)N(2)O(4))(H(2)O)(3)](n), is a new monoclinic polymorph. The ortho-rhom-bic form has previously been reported [Ma et al. (2006 ?). Acta Cryst. E62, m2528-m2529]. The Cd-N and Cd-O bond lengths range from 2.265?(3) to 2.333?(3)?Å; a weak Cd-O inter-action is also present, the inter-atomic distance being 2.658?(4)?Å. The Cd(II) ions, which have a distorted penta-gonal-bipyramidal geometry, are bridged by pyrazine-2,3-dicarboxyl-ato ligands, forming a zigzag chain structure. The chains are connected by O-H?O hydrogen bonds into a three-dimensional framework.

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catena-Poly[aqua-bis-(?-3-chloro-benzo-ato-?(2) O:O')zinc].

Project description:In the polymeric title compound, [Zn(C7H4ClO2)2(H2O)] n , the Zn(II) cation is located on a twofold rotation axis and is coordinated by carboxylate O atoms of four monodentate chloro-benzoate anions and by one water mol-ecule, located on a twofold rotation axis, in a distorted square-pyramidal geometry. In the anion, the carboxyl-ate group is twisted away from the attached benzene ring by 44.16?(11)°. The chloro-benzoate anion bridges Zn(II) cations, forming polymeric chains running along the c-axis direction. O-H?O hydrogen bonds between coordinating water mol-ecules and carboxyl-ate groups link adjacent chains into layers parallel to the bc plane.

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catena-Poly[[[tetra-aqua-cadmium(II)]-?-3,3'-[p-phenyl-enebis(oxymethyl-ene)]bis-(1-pyridinioacetate)] dinitrate hemihydrate].

Project description:In the title polymeric coordination complex, {[Cd(C(22)H(20)N(2)O(6))(H(2)O)(4)](NO(3))(2)·0.5H(2)O}(n), obtained from the self-assembly of the flexible double betaine 3,3'-[p-phenyl-enebis(oxymethyl-ene)]bis-(1-pyridinioacetate) with cadmium nitrate, both the octa-hedrally coordinated Cd(II) cation and the substituted betaine ligand lie on inversion centres. The chains constructed through the trans-related acetate groups of the ligand are inter-connected via O-H?O hydrogen bonds involving coordinated aqua ligands, the nitrate anions and the partial-occupancy (0.25) water mol-ecule of solvation, forming a three-dimensional structure.

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catena-Poly[[di-aqua-bis-(4-formyl-benzoato-?O (1))copper(II)]-?-pyrazine-?(2) N:N'].

Project description:In the title polymeric compound, [Cu(C8H5O3)2(C4H4N2)(H2O)2] n , the Cu(II) atom is located on a twofold rotation axis and has a slightly distorted octa-hedral coordination sphere. In the equatorial plane, it is coordinated by two carboxyl-ate O atoms of two symmetry-related monodentate formyl-benzoate anions and by two N atoms of the bridging pyrazine ligand, which is bis-ected by the twofold rotation axis. The axial positions are occupied by two O atoms of the coordinating water mol-ecules. In the formyl-benzoate anion, the carboxyl-ate group is twisted away from the attached benzene ring by 6.2?(2)°, while the benzene and pyrazine rings are oriented at a dihedral angle of 68.91?(8)°. The pyrazine ligands bridge the Cu(II) cations, forming polymeric chains running along the b-axis direction. Strong intra-molecular O-H?O hydrogen bonds link the water mol-ecules to the carboxyl-ate O atoms. In the crystal, O-Hwater?Owater hydrogen bonds link adjacent chains into layers parallel to the bc plane. The layers are linked via C-Hpyrazine?Oform-yl hydrogen bonds, forming a three-dimensional network. There are also weak C-H?? inter-actions present.

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Crystal structure of catena-poly[[[trans-bis(aceto-nitrile-κN)diaquacobalt(II)]-μ-pyrazine-κ(2) N:N'] dinitrate].

Project description:The central structural motif of the title coordination polymer, [Co(NO3)2(C4H4N2)(CH3CN)2(H2O)2] n , is a chain composed of Co(II) ions linked by bis-monodentate bridging pyrazine ligands through their N atoms. The Co(II) ion is located on an inversion center and is additionally coordinated by two O atoms of water mol-ecules and two N atoms of aceto-nitrile mol-ecules. The resultant N4O2 coordination sphere is distorted octa-hedral. The linear cationic chains extend parallel to the a axis and are aligned into layers parallel to the ac plane. Nitrate anions are situated in the space between the Co(II) chains and form O-H⋯O hydrogen bonds with the coordinating water mol-ecules, leading to a three-dimensional network structure. Weak C-H⋯O hydrogen bonds are also present between pyrazine or aceto-nitrile mol-ecules and the nitrate anions.

| S-EPMC4770956 | biostudies-literature

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