Magnetic coupling between metal spins through the 7,7,8,8- tetracyanoquinodimethane (TCNQ) dianion

Abstract

A family of magnetic metal-organic frameworks, (Ph3PMe) 2[M2(TCNQ)3] {M=Fe2+, Co 2+, Ni2+ and Zn2+} have been prepared and structurally characterized. The honeycomb-like "layers" consist of MII ions doubly bridged with dinitrilomethane moieties of two 7,7,8,8-tetracyanoquinodimethane (TCNQ) dianions which are further connected through phenyl rings to form a 3D dianionic framework [M2TCNQ 3]2- with Ph3PMe+ cations filling cavities that run along the c axis. Studies of the magnetic coupling through the TCNQ dianion in these structures revealed that it can promote long-range magnetic ordering despite the long coupling pathway. Dianionic coordination framework: A family of magnetic metal-organic..