[Mnii2(bpym)(H2O)8]4+ and [Miv(CN)8]4− (M = Mo and W) as building blocks in designing bpym- and cyanide-bridged bimetallic three-dimensional networks (bpym = 2,2′-bipyrimidine)

Abstract

One-pot reaction between the dinuclear [Mn^II₂(bpym)(H₂O)₈]⁴⁺ complex and the mononuclear [M^IV(CN)₈]⁴⁻ unit (M = Mo and W; bpym = 2,2′-bipyrimidine) in aqueous solution yields the novel heterobimetallic complexes of formula {(μ-bpym)[Mn(H₂O)]₂-(μ-NC)₆M(CN)₂} with M = Mo (1) and W (2). 1 and 2 are isostructural three-dimensional compounds where the manganese atoms are bridged by bisbidentate bpym and hexakismonodentate octacyanometalate units. Variable-temperature magnetic susceptibility data of 1 and 2 show the occurrence of a significant antiferromagnetic coupling between the high spin manganese(II) ions through bridging bpym (Jca. −1.1 cm⁻¹, the exchange Hamiltonian being defined as H = −JS_A·S_B).