Bi-nuclear nitrosyl iron complex with 2-mercapto-imidazolyl: Synthesis, structure and magnetic properties

Bi-nuclear neutral paramagnetic nitrosyl iron complex [Fe2(C3H3N2S)2(NO)4] (I) has been synthesized by the exchange reaction of Na2Fe2(S2O3)2(NO)4$4H2O with imidazole-2-thiol. As it follows from X-ray analysis, complex I (space group P2(1)/n, ZZ2) has centrosymmetric dimeric structure, with the iron atoms linked via structural fragment -m-N–C–S. Isomeric shift of I dFe is 0.196(1) mm/s and quadrupole resolution DEQ is 1.109(2) mm/s at TZ293 K. As follows from magnetic measurements, there are two paramagnetic centers with spin 1/2 in molecules [Fe2(C3H3N2S)2(NO)4], which are connected by anti-ferromagnetic exchange (K34.6 cmK1). q 2005 Elsevier B.V. All rights reserved