Synthesis, structural characterization and properties of one-dimensional coordination polymers of cobalt(II)- and nickel(II)-phosphonate complexes with 2,2′-bipyridine as a secondary ligand component: Observation of both cis and trans conformations of a diphosphonic acid
Two new isostructural cobalt and nickel phosphonates [M II(2,2′-bipy) 2LH 4] n [LH 2] n , M = Co (compound 1), M = Ni (compound 2) were hydrothermally synthesized from p-xylylenediphosphonic acid (LH 4) and the corresponding metal salts with 2,2′-bipyridine as secondary ligand component. X-ray cryst...
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Published in | Polyhedron Vol. 29; no. 15; pp. 2985 - 2990 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
14.10.2010
|
Subjects | |
Online Access | Get full text |
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Summary: | Two new isostructural cobalt and nickel phosphonates [M
II(2,2′-bipy)
2LH
4]
n
[LH
2]
n
, M
=
Co (compound
1), M
=
Ni (compound
2) were hydrothermally synthesized from
p-xylylenediphosphonic acid (LH
4) and the corresponding metal salts with 2,2′-bipyridine as secondary ligand component. X-ray crystallography shows that both the compounds consist of 1D [M(2,2′-bipy)
2LH
4]
2+ chains and [LH
2]
2− anions in which LH
4 adopts a
cis conformation during its coordination to the metal center. The corresponding
trans conformation is observed in the anionic form [LH
2]
2−. The hydrogen bonding in the crystal structure leads to cylindrical tubes extended via
p-xylylenediphosphonic acid resulting in a 2D supramolecular sheet.
Two new isomorphous cobalt and nickel phosphonates [M
II(2,2′-bipy)
2LH
4]
n
[LH
2]
n
, M
=
Co (compound
1), M
=
Ni (compound
2) were hydrothermally synthesized from
p-xylylenediphosphonic acid (LH
4) and the corresponding metal salts with 2,2′-bipyridine as secondary ligand component. Both the compounds
1 and
2 are characterized by routine elemental analyses, IR-, electronic-spectral analyses, thermogravimetric studies and unambiguously characterized by single crystal X-ray crystallography. The structures were refined in monoclinic space group
C2/
c. The crystal structure consists of 1D [M(2,2′-bipy)
2LH
4]
2+ chains and [LH
2]
2− anions. The flexibility of non-rigid ligand
p-xylylenediphosphonic acid (LH
4) tends to adopt a rare
cis conformation in the crystal structure to meet the coordination requirement of the metal center from the usual
trans conformation. The hydrogen bonding in the crystal structure leads to cylindrical tubes that extend via
p-xylylenediphosphonic acid resulting in a 2D supramolecular sheet throughout the crystal. Compounds
1 and
2 are additionally characterized by thermogravimetric studies. |
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ISSN: | 0277-5387 |
DOI: | 10.1016/j.poly.2010.08.008 |