Reaction of molybdenum mononitrosyl halides with schiff bases: Hydrolysis of azomethine links, formation of monometallic tris(3,5-dimethylpyrazolyl)borato phenolato complexes containing “free” aldehyde groups, and the x-ray structure of [Mo(NO) {HB(3,5-Me 2C 3HN 2) 3} Cl{OC 6H 4(3-CHO)(4-OH)}

Abstract

The reaction of 2 mol equiv. of [Mo(NO){HB(dmpz) 3}X 2] ((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-C 6H 4(NH 2) 2 and 1,6-NH 2(CH 2) 6NH 2 afforded monometallic complexes [Mo(NO) {H(dmpz3)} X(OC6H4 CHO)]. Sodium borohydride reduction of the Schiff bases obtained from the hydroxybenzaldehydes and 1,4-C 6H 4(NH 2) 2 followed by reaction with [Mo(NO){HB(dmpz) 3 Cl 2}] afforded the bimetallic species [{Mo(NO)HB(dmpz) 3}Cl{(OC 6H 4CH 2NH) 2C 6H 4}]. These compounds were characterized spectroscopically and the structure of a closely related compound, [Mo(NO){HB(dmpz) 3}Cl{OC 6H 3(3-CHO)(4-OH)}], has been determined crystallographically.