Reaction of molybdenum mononitrosyl halides with Schiff bases: Hydrolysis of azomethine links,formation of monometallic tris

Abstract

The reaction of 2 mol equiv. of [Mo(NO){HB(dmpz)3}X2] ((HBdmpz)3 = tris(3,5-dimethylpyrazolyl)borate; X = Cl or I) with Schiff base ligands derived by condensation of 2 mol equiv. of para- and meta-hydroxybenzaldehyde with 1,4-C6H4(NH2)2 and 1,6-NH2(CH2)6NH2 afforded monometallic complexes [Mo(NO) {H(dmpz3)} X(OC6H4 CHO)]. Sodium borohydride reduction of the Schiff bases obtained from the hydroxybenzaldehydes and 1,4-C6H4(NH2)2 followed by reaction with [Mo(NO){HB(dmpz)3 Cl2}] afforded the bimetallic species [{Mo(NO)HB(dmpz)3}Cl{(OC6H4CH2NH)2C6H4}]. These compounds were characterized spectroscopically and the structure of a closely related compound, [Mo(NO){HB(dmpz)3}Cl{OC6H3(3-CHO)(4-OH)}], has been determined crystallographically.