Crystal structure, magnetic and thermal properties of the one-dimensional complex [Nd(pzam)3(H2O)Mo(CN)8] · H2O

The new d–f cyanido-bridged 1D assembly [Nd(pzam)3(H2O)Mo(CN)8] · H2O was prepared by self-assembly of pyrazine-2-carboxamide (pzam), Nd(NO3) · nH2O and (Bu3NH)3[Mo(CN)8] · 4H2O in acetonitrile. X-ray crystallographic studies indicate that the complex comprises chains of alternating, cyanido-bridged [Nd(pzam)3(H2O)]3+ and Mo(CN)8]3− fragments. The magneto-structural properties have been studied by field-dependent magnetization and specific heat measurements at low temperatures (⩾0.3 K). Below ≈10 K the Nd(III) moment is well approximated by an effective spin S = 1/2, with anisotropic g-tensor. The exchange coupling between the Nd(III) and the Mo(V) spins S = 1/2 along the structural chains is found to be ferromagnetic, with J/kB = 1.8 ± 0.2 K and approximately XY (planar) anisotropy. No evidence for 3D interchain magnetic ordering is found. A comparison with magneto-structural data of other cyanido-bridged complexes involving the Nd(III) ion is presented.