Molecule-Based Magnets - Ferromagnetic and Antiferromagnetic Interactions in Nickel(II) Cyclohexasiloxanolate Sandwich Complexes

Cornia A; Fabretti AC; Gatteschi D; Palyi G; Rentschler E; Shchegolikhina OI; Zhdanov AA

Inorganic Chemistry, Vol.34, No.21, 5383-5387, 1995

Cornia A, Fabretti AC, Gatteschi D, Palyi G, Rentschler E, Shchegolikhina OI, Zhdanov AA

Ferromagnetic exchange-coupling interactions mediated by siloxanolate ligands have been detected in the two nickel(II) nanoscale clusters Na-2[(PhSiO(2))(6)Na4Ni4(OH)(2)(O-2-SiPh)(6)]. 16Bu(n)OH (1) and Na-2[(PhSiO(2))(6)Ni-6(O(2)SiPh)(6)Cl]. 12CH(3)OH . H2O (2), which qualify as interesting precursors for new molecule-based magnetic materials. Complex 1 has an S = 4 spin ground state, whereas complex 2 has an S = 0 spin ground state. due to the presence of additional antiferromagnetic interactions through the encapsulated mu(6)-chloride ion.

Keywords:NITROPHENYL NITRONYL NITROXIDE;CRYSTAL-STRUCTURE;SOLID-STATE;TRANSITION;MODELS;BIOMINERALIZATION;EXCHANGE;CORE;NI