NDLI: Supramolecular architectures of novel chromium(III) oxalate complexes: steric effects of the ligand size and building-blocks approach

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Juric, Marijana Andros, Lidija Molcanov, Kresimir Planinic, Pavica
Description	Author Affiliation: Andros L ( Ruder Boskovic Institute, Bijenicka cesta 54, 10000 Zagreb, Croatia.)
Abstract	Five new oxalate complexes of chromium(III), $[Hphen][Cr(phen)(C_{2}O_{4})_{2}]·2H_{2}O$ (1), $[Cr(phen)_{2}(C_{2}O_{4})][Cr(phen)(C_{2}O_{4})_{2}]·3H_{2}O$ (2), $[Cr(phen)_{2}(C_{2}O_{4})]NO_{3}·H_{2}C_{2}O_{4}·H_{2}O$ (3), $[Cr(bpy)_{2}(C_{2}O_{4})][Cr(bpy)(C_{2}O_{4})_{2}]·3H_{2}O$ (4) and $[Cr(bpy)_{2}(C_{2}O_{4})]NO_{3}·1/2H_{2}C_{2}O_{4}·4H_{2}O$ (5) (phen = 1,10-phenanthroline , bpy = 2,2′-bipyridine ), were prepared by using an (oxalato)tantalate(V) solution as a source of oxalate ligands . The compounds contain either the discrete mononuclear $[Cr(L)_{2}(C_{2}O_{4})]^{+}$ cation [L = phen (3); L = bpy (5)] or the discrete mononuclear $[Cr(L)(C_{2}O_{4})_{2}]^{−}$ anion [L = phen (1)], or both types of mononuclear ions [L = phen (2); L = bpy (4)]. The crystal structures are dominated by the hydrogen-bonding and π⋯π-stacking interactions that give rise to the overall two- (compounds 1, 2, 4, 5) or three-dimensional (compound 3) architectures. Compounds 2 and 4 represent a borderline case between isostructurality and non-isostructurality; they exhibit an analogous packing of the cation and the anion units, but the crystallization water molecules occupy different positions – due to a difference in size between the phen and bpy ligands . The influence of steric factors is evident also in the case of 3 and 5, which, despite very similar chemical formulae, exert a completely different packing of the constituents. By the self-assembling of 1 and 4, used as building blocks in the reaction with calcium(II) cations , the heterobimetallic polymeric compounds $\{[CaCr_{2}(phen)_{2}(C_{2}O_{4})_{4}]·5H_{2}O\}_{n}$ (6) and $\{[CaCr_{2}(bpy)_{2}(C_{2}O_{4})_{4}]·0.83H_{2}O\}_{n}$ (7) were obtained. The crystal structure of 7 is reported: the $[Cr(bpy)(C_{2}O_{4})_{2}]^{−}$ unit, through the two oxalate groups, acts as a chelating ligand towards Ca cations , resulting in heterometallic one-dimensional double zigzag chains, formed of diamond -shaped units. The characterization of the compounds obtained was accomplished by the spectroscopy and thermal analysis methods.
ISSN	14779226
Issue Number	48
Volume Number	41
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-12-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chromium Chemistry Coordination Complexes Oxalates 2,2'-Dipyridyl Chemical Synthesis Crystallography, X-Ray Hydrogen Bonding Ligands Molecular Conformation Phenanthrolines Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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