Acta Crystallographica Section B

Structural Science

Volume 57, Part 3 (June 2001)


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Acta Cryst. (2001). B57, 303-310    [doi:10.1107/S0108768101004426]

Hydrogen-bonded hexagonal and pseudo-hexagonal grid motifs in supramolecular cobalt(II) and nickel(II) cupferronato complexes incorporating neutral N-donors with intermolecular NH2 connectors and solvent molecules

A. Deák, A. Kálmán, L. Párkányi and I. Haiduc

Abstract: The cobalt(II) and nickel(II) cupferronato (N-nitroso-N-phenylhydroxylaminato) mixed-ligand complexes of 2-aminopyridine (2-NH2py) [Co(PhN2O2)2(2-NH2py)2] (1), [Ni(PhN2O2)2(2-NH2py)2] (2) and 2,6-diamino-4-phenyl-1,3,5-triazine (dpt) [Co(PhN2O2)2(dpt)2]·[Co(PhN2O2)2(EtOH)2] (3) have been synthesized and characterized by X-ray diffraction analysis. The cobalt (1) and nickel (2) complexes are isostructural. The crystal lattice of (3) contains different neutral cobalt(II) complexes [Co(PhN2O2)2(dpt)2] (3a) and [Co(PhN2O2)2(EtOH)2] (3b). Molecules of (1)-(3) contain octahedral metal centres with all-cis-(1) and -(2) and all-trans-(3) disposal of the ligands. Intramolecular N-H...O hydrogen bonding between the NH2 groups and the O atom of the cupferronato anion can be observed in (1)-(3). Intermolecular N-H...O and N-H...N interactions between symmetry-related molecules of (1) and (2) led to hexameric aggregates which connect through common edges into a two-dimensional supramolecular network of hexagonal-grid type. In complex (3) the self-complementary dpt units of the (3a) molecules are maintained by intermolecular N-H...N hydrogen bonds, generating infinite chains. These (3a) chains are crosslinked by the (3b) subunits via N-H...O and O-H...N hydrogen bonds, thus completing the parallel two-dimensional supramolecular network consisting of pseudo-hexagonal-grid sheets. In each crystal structure the two-dimensional supramolecular networks are controlled by both hydrogen bonds and [bold pi]...[bold pi] stacking interactions.

Online 25 May 2001

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Structure factor file (CIF format) (152.9 kbytes)
Contains datablock coapir

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Structure factor file (CIF format) (337.1 kbytes)
Contains datablock niapir

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Structure factor file (CIF format) (541.5 kbytes)
Contains datablock codpt

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Structure factor file (CIF format) (277.7 kbytes)
Contains datablock coapir

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