Synthesis, crystal structures and magnetic properties of two new coordination polymers based on the tricyanoethenolate ligand: {Fe(C5N3O)2(CH3CN)2}∞ and {Co(C5N3O)2(C4H4O)2}∞

Single crystals of two new coordination polymers {Fe(C5N3O)2(CH3CN)2}∞ (1) and {Co(C5N3O)2(C4H4O)2}∞ (2) have been prepared and their structures and magnetic properties determined. Reactions of TCNE with Fe4Cl8(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 CoII 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.

This paper reports two new Fe(II) and Co(II) compounds in which the 1,2,2-tricyanoethanolate ligand coordinates via two of its three nitrile N atoms which leads to the formation of two-dimensional sheets. The metal atoms are in slightly distorted octahedral environments with axially bonded solvent molecules.Figure optionsDownload as PowerPoint slide