Syntheses and Spectroscopic Studies on Macrocyclic Complexes of Dioxomolybdenum(VI) with Furil as Precursor

Abstract

Due to their biological relevance, molybdenum catalyzed oxygen transfer reactions have great interest. With this view, some dioxomolybdenum(VI) complexes with general formula [MoO2(mac)](acac)2, (where mac = tetraazamacrocyclic ligands derived from condensation of furil with 1,2-ethanediamine or 1,3-propanediamine and their reaction with β-diketones) have been synthesized using dioxometal ion as kinetic template. The prepared complexes have been characterized by electrical conductance, elemental analyses, infrared and electronic data. All the dioxomoly-bdenum(VI) complexes have octahedral geometry with six coordination.

New Insights into the Chemistry of cis-Dioxomolybdenum(VI) Schiff Base Complexes with Macrocyclic Ligands

“…The dioxomolybdenum(VI) complexes showed two Mo=O stretching bands at 903-910 cm -1 and 930-946 cm -1 because of two stretching vibrations: asymmetric and symmetric stretching of the cis-[MoO 2 ] 2+ moiety in C 2V symmetry 38 . Those two infrared spectral bands are assigned to ν asym(O=Mo=O) and ν sym(O=Mo=O) vibrations respectively [38][39][40][41][42][43][44] . Ν asym (O=Mo=O) vibrations are lesser than those of ν sym (O=Mo=O) 45,46 .…”

Synthesis and Antibacterial Activity of Novel Molybdenum Complexes with Macrocyclic Schiff Base Derived from Furanylethanedione

“…These bands include one asymmetric stretching vibration and other symmetric stretching vibration of cis-[MoO2] 2+ moiety in C2V symmetry [38]. These bands are assigned to νasym(O=M=O) and νsym(O=M=O) vibrations, respectively [38][39][40][41][42][43][44]. The νasym(O=M=O) vibrations are less than those of νsym(O=M=O) [45,46].…”

Dioxomolybdenum (VI) Compounds of Macrocyclic Schiff base Ligands: Preparation, Characterization and Antibacterial Activity

“…In dioxomolybdenum(VI) c o m p o u n d s , c i s -[ M o O 2 ] 2 + d e m o n s t r a t e s asymmetric and symmetric stretching vibrations at 896-910 cm -1 and 962-970 cm -1 as a result of C 2V symmetry 69 . There are two infrared spectral bands at these wavelengths that are associated with n asym(O=Mo=O) and n sym(O=Mo=O) vibrations respectively [69][70][71][72][73][74][75][76] . In comparison to n sym(O=Mo=O) , n asym(O=Mo=O) vibrations are lower 77,78 .…”