Synthesis, crystal structures and magnetic properties of two new coordination polymers based on the tricyanoethenolate ligand: {Fe(C5N3O)(2)(CH3CN)(2)}(infinity) and {Co(C5N3O)(2)(C4H4O)(2)}(infinity)
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abstract
Single crystals of two new coordination polymers {Fe(C5N 3O)2(CH3CN)2} (1) and {Co(C5N3O)2(C4H 4O)2} (2) have been prepared and their structures and magnetic properties determined. Reactions of TCNE with Fe 4Cl8(THF)6 in acetonitrile/diethyl ether and TCNE with Co4Cl8(THF)6 in tetrahydrofuran both lead to the transformation of TCNE to 1,2,2-tricyanoethanolate and the formation of two new compounds consisting of infinite, two-dimensional sheets of [Fe(C4N3O)2(CH3CN)2] and [Co(C5N3O)2(C4H4O) 2] units with bridging tricyanoethenolate groups. The 1,2,2-tricyanoethanolate ions coordinate to the FeII and Co II centers through two of its three CN groups and not via the O atom. The metal atoms are in slightly distorted octahedral environments with axially bonded acetonitrile and tetrahydrofuran molecules. These sheets are linked by hydrogen bonds involving the ethanolate O atoms and hydrogen atoms of the coordinated solvent molecules. 2005 Elsevier Ltd. All rights reserved.
