Synthesis and structures of copper (I) and cobalt(III) dimers with the dicyano-acetic acid methyl ester anion derived from TCNE

摘要

In the presence of CoCl2 · 6H2O or CuCl, the reaction of tetracyanoethylene and CH3OH provides a dicyano-acetic acid methyl ester anion (L1), which has been obtained as a bridged ligand in two compounds [(PPh3)2-(NC)2Co~(III)( μ2-L1_2)Co~(III)(CN)2(PPh3)2] · (PPh3)(CH3OH) 1 and [(PPh3)2Cu~I( μ2-L1_2)Cu~I(PPh3)2] 2. The coordination geometry of the Co atom in 1 is distorted octahedral, and the Co atoms are μ2-bridged by two pairs of L. For compound 2, Cu is coordinated with two P atoms from PPh3 and two N atoms of L1, and two Cu atoms are linked by μ2-bridged L1.