The first new hydrogen-bonded heterohexanuclear complex [(salen)Cu](4)[(salen)Fe(H2O)(2)](2)(ClO4)(2): Molecular and crystal structure and magnetic properties

The preparation, magnetic properties, and crystal structure of [(salen)Cu]( 4) [(salen)Fe(H2O)P](2)(ClO4)(2) via hydrogen bonding are described [salen = N,N'-ethylenebis (salicylideneiminale)]. Crystals are triclinic, of space group P (1) over bar, with cell constants a = 12.853(3), b = 13.921(3), c = 14.251(3) Angstrom, alpha = 68.68(3)degrees, beta = 87.86(3)degrees, gamm a = 86.82(3)degrees, and Z = 1. The structure was solved and refined to R = 0.064 and R' = 0.068. The structure comprises the hexanuclear units which result from the linking of four mononuclear fragments [(salen)Cu] and two m ononuclear fragment [(salen)Fe(H2O)](+), through Cu-O ... H-O-Fe-O-H ... O- Cu hydrogen bonds of coordinating H2O. In this complex, Fe-III ions are in almost square-planar surroundings. The temperature dependences of the magne tic susceptibilities of the complex have been studied in the 4.2-300 K rang e, indicating the presence of an antiferromagnetic interactions between met al ions.