NDLI: Dinuclear cobalt and manganese squarate complexes with bidentate N-donor ligand: syntheses, crystal structures, spectroscopic, thermal and voltammetric studies

Content Provider	SpringerLink
Author	Uçar, İ. Bulut, A. Büyükgüngör, O. Karadağ, A.
Copyright Year	2006
Abstract	The crystal structures of [M$_{2}$(phen)$_{4}$(H$_{2}$O)$_{2}$(C$_{4}$O$_{4}$)]· C$_{4}$O$_{4}$· 8H$_{2}$O [M = Co$^{2+}$ (1), Mn$^{2+}$ (2); phen: 1,10-phenanthroline] complexes have been prepared and characterized by IR spectroscopy, thermal analysis and single X-ray diffraction techniques. Their structures consist of [Co$_{2}$(phen)$_{4}$(H$_{2}$O)$_{2}$(C$_{4}$O$_{4}$)]$^{2+}$ (1) and [Mn$_{2}$(phen)$_{4}$(H$_{2}$O)$_{2}$(C$_{4}$O$_{4}$)]$^{2+}$ (2) dinuclear cobalt(II) and manganese(II) cations, uncoordinated C$_{4}$O 4 2− (SQ$^{2−}$) dianion and crystalization water molecules. In both complexes the metal ions have distorted octahedral geometry. The squarate adopts the μ-1,3 (1) and (2) bis(monodentate) coordination modes, the intradimer M–M separation being 8.053(7) Å (1) and 8.175(4) Å (2), respectively, while the other squarate acts as a counter anion. The voltammetric behaviour of complexes (1) and (2) was investigated in DMSO (dimethylsulfoxide) solution by cyclic voltammetry using n-Bu$_{4}$NClO$_{4}$ as supporting electrolyte. The complexes exhibit both metal and ligand centred electroactivity in the potential ±1.75 V versus Ag/AgCl reference electrode. The dianion SQ$^{2−}$ is oxidized in two consecutive steps to the corresponding radical monoanion and neutral form.
Starting Page	1057
Ending Page	1065
Page Count	9
File Format	PDF
ISSN	03404285
Journal	Transition Metal Chemistry
Volume Number	31
Issue Number	8
e-ISSN	1572901X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Inorganic Chemistry Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry Materials Chemistry Metals and Alloys

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