Syntheses and reactivities of new bis(imido)Mo(VI) complexes of hydrotris(3,5-dimethyl-1-pyrazolyl)borate and X-ray molecular structures of [{HB(3,5-Me 2C 3N 2H) 3}Mo(Nmes) 2X] (X=Cl or OH; mes=2,4,6-trimethylphenyl)

• Published in: Polyhedron 2002-06, Vol.21 (12), p.1211-1215
• Main Authors: Cho, Hyun Yong, Roh, Soo-Gyun, Jeong, Jong Hwa
• Format: Article
• Language: English
• Subjects: Mononuclear bis(imido) Mo(VI) complexes; Pyrazole; X-ray crystal structures
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(02)01008-2

A chloride substitution reaction of a bis(imido) molybdenum(VI) complex, [Mo(Nmes) 2Cl 2(dme)] (dme=1,2-dimethoxyethane) with KTp* (Tp*=hydrotris(3,5-dimethyl-1-pyrazole)borate) in THF resulted in [Tp*Mo(Nmes) 2Cl] 1 in good yield. The analogous methylated complex [Tp*Mo(Nmes) 2(CH 3)] 2 was formed by reaction of 1 with 1 equiv. of CH 3MgCl in THF, while [Tp*Mo(Nmes) 2(OH)] 3 was conveniently produced from 2 in the presence of wet methanol under aerobic conditions. The complexes were characterized by 1H NMR and IR spectroscopy. The molecular structures of complexes of 1 and 3 have been determined by X-ray single crystal analyses. The crystal structures of the complexes show that the three nitrogen atoms of Tp* are not equidistant from the respective Mo(VI) centers. Each Mo(VI) centre of 1 and 3 is in a distorted octahedral coordination geometry with a facially co-ordinated Tp* and two Nmes ligands. The complexes of 1 and 3 contain linear imido ligands A chloride substitution reaction of [Mo(Nmes) 2Cl 2(dme)] with KTp* (Tp*=hydrotris(3,5-dimethyl-1-pyrazole)borate) in THF resulted in [Tp*Mo(Nmes) 2Cl], and the analogous methylated complex [Tp*Mo(Nmes) 2(CH 3)] was produced from the chloro compound on reaction with CH 3MgCl in THF, while [Tp*Mo(Nmes) 2(OH)] was conveniently produced from the methyl compound.