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Bis(guanidinium) bis-(4-hydroxy-pyridine-2,6-dicarboxyl-ato-?O,N,O)nickel-ate(II) dihydrate.

ABSTRACT: The reaction of nickel(II) nitrate hexa-hydrate, guanidine (G) and 4-hydroxy-pyridine-2,6-dicarboxylic acid (hypydcH(2)) in a 1:2:2 molar ratio in aqueous solution resulted in the formation of the title compound, (CH(6)N(3))(2)[Ni(C(7)H(3)NO(5))(2)]·2H(2)O or (GH)(2)[Ni(hypydc)(2)]·2H(2)O. The six donor atoms of the two 4-hydroxy-pyridine-2,6-dicarboxyl-ate or (hypydc)(2-) ligands form a distorted octa-hedral arrangement around the Ni(II) centre. Considerable C-O?? stacking inter-actions between the CO groups of carboxyl-ate fragments and the pyridine rings of (hypydc)(2-) with a distance of 3.3212?(8)?Å are observed. In the crystal structure, a wide range of noncovalent inter-actions consisting of hydrogen bonding (of the types O-H?O and N-H?O), ion pairing, and ?-? [centroid-centroid distance 3.8037?(5)?Å], N-H?? and C-O?? stacking inter-actions connect the various components into a supra-molecular structure.

SUBMITTER: Aghabozorg H 

PROVIDER: S-EPMC2915088 | biostudies-other | 2007

REPOSITORIES: biostudies-other

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Bis(guanidinium) bis-(4-hydroxy-pyridine-2,6-dicarboxyl-ato-κO,N,O)nickel-ate(II) dihydrate.

Aghabozorg Hossein H   Motyeian Elham E   Attar Gharamaleki Jafar J   Soleimannejad Janet J   Ghadermazi Mohammad M   Spey Sharon Elizabeth E  

Acta crystallographica. Section E, Structure reports online 20071212 Pt 1

The reaction of nickel(II) nitrate hexa-hydrate, guanidine (G) and 4-hydroxy-pyridine-2,6-dicarboxylic acid (hypydcH(2)) in a 1:2:2 molar ratio in aqueous solution resulted in the formation of the title compound, (CH(6)N(3))(2)[Ni(C(7)H(3)NO(5))(2)]·2H(2)O or (GH)(2)[Ni(hypydc)(2)]·2H(2)O. The six donor atoms of the two 4-hydroxy-pyridine-2,6-dicarboxyl-ate or (hypydc)(2-) ligands form a distorted octa-hedral arrangement around the Ni(II) centre. Considerable C-O⋯π stacking inter-actions between  ...[more]

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