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A new heteroleptic oxalate‐based compound: poly[[2‐(aminomethyl)pyridine]di‐μ 6 ‐oxalato‐chromium(III)potassium(I)]
Author(s) -
Kenfack Tsobnang Patrice,
Wenger Emmanuel,
Ponou Siméon,
Dahaoui Slimane,
Lambi Ngolui John,
Lecomte Claude
Publication year - 2014
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s205322961303088x
Subject(s) - chemistry , crystallography , pyridine , oxalate , monoclinic crystal system , bimetallic strip , imidazole , crystal structure , chromium , hydrogen bond , stereochemistry , inorganic chemistry , medicinal chemistry , molecule , metal , organic chemistry
The title compound, [KCr(C 2 O 2 ) 2 (C 6 H 8 N 2 )] n , was obtained from aqueous solution and analyzed with single‐crystal X‐ray diffraction at 100 K. It crystallizes in the monoclinic space group C 2/ c and displays a three‐dimensional polymeric architecture built up by bimetallic oxalate‐bridged Cr III –K helical chains linked through centrosymmetric K 2 O 2 units to yield a sheet‐like alternating P / M arrangement which looks like that of the previously described two‐dimensional [NaCr(ox) 2 (pyim)(H 2 O)]·2H 2 O [pyim is 2‐(pyridin‐2‐yl)imidazole; Lei et al. (2006). Inorg. Chem. Commun. 9 , 486–488]. The Cr III ions in each helix have the same chirality. The infinite neutral sheets are eclipsed with respect to each other and are held together by a hydrogen‐bonding network involving 2‐(aminomethyl)pyridine H atoms and oxalate O atoms. Each sheet gives rise to channels of Cr 4 K 4 octanuclear rings and each resultant hole is occupied by a pair of 2‐(aminomethyl)pyridine ligands with partial overlap. The shortest Cr...Cr distance [5.593 (4) Å] is shorter than usually observed in the K– M III –oxalate family.