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Crystals 2013, 3(2), 275-288; doi:10.3390/cryst3020275
Article

Hydrogen-Bonding in Two Pyridinium Salts of [Mo2O4Cl4(μ2-dmsH)]3−Complex (dmsH = a Half-Neutralized Form of 2,2-Dimethylsuccinic Acid)

Department of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, Ljubljana 1000, Slovenia
Received: 15 January 2013 / Revised: 12 March 2013 / Accepted: 14 March 2013 / Published: 3 April 2013
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Abstract

Reactions of a mononuclear molybdenum(V) starting material, (PyH)5[MoOCl4(H2O)]3Cl2, with 2,2-dimethylsuccinic acid in the presence of base afforded two products, (PyH)3[Mo2O4Cl42-dmsH)]·1/2CH3CN (1) and (PyH)4[Mo2O4Cl42-dmsH)]Cl (2). As revealed by the X-ray structure analysis, the half-neutralized form of the dicarboxylic acid, the dmsH ion, coordinated to the well-known {Mo2O4}2+ core in the syn-syn bidentate bridging manner. In both compounds, the non-ionized terminus of the ligand, the COOH function, participated in hydrogen-bonding interactions. The incorporation of the chloride counteranion in 2, prevented the formation of the common “carboxylic acid dimer” which was observed for 1. Instead, a hydrogen-bonded linkage of the COOH function with the chloride occurred.
Keywords: molybdenum; {Mo2O4}2+ core; carboxylate complexes; hydrogen-bonding; carboxylic acid dimer molybdenum; {Mo2O4}2+ core; carboxylate complexes; hydrogen-bonding; carboxylic acid dimer
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Modec, B. Hydrogen-Bonding in Two Pyridinium Salts of [Mo2O4Cl4(μ2-dmsH)]3−Complex (dmsH = a Half-Neutralized Form of 2,2-Dimethylsuccinic Acid). Crystals 2013, 3, 275-288.

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