title: 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=Fe(2+), Co(2+), Ni(2+) and Zn(2+)} have been prepared and structurally characterized. The honeycomb-like "layers" consist of M(II) 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 [M2TCNQ3](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.
authors.affiliation: Department of Chemistry, Texas A&M University, College Station, TX 77842-3012 (USA); Department of Chemistry, Fayoum University, Fayoum, 63514 (Egypt).
authors.forename: Mohamed R
authors.initials: MR
authors.lastname: Saber
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Prosvirin
authors.forename: Brendan F
authors.initials: BF
authors.lastname: Abrahams
authors.forename: Robert W
authors.initials: RW
authors.lastname: Elliott
authors.forename: Richard
authors.initials: R
authors.lastname: Robson
authors.forename: Kim R
authors.initials: KR
authors.lastname: Dunbar
keywords: TCNQ dianion; magnetic properties; metal-organic frameworks; transition metals