Isomerism of neutral tungsten oxotetrafluoride complexes with substituted hydrazines

By the 19F, 1H, 13C NMR method isomerism of tungsten oxotetrafluoride neutral complexes with substituted hydrazines has been investigated. It shown that steric hindrance in the coordinated hydrazine itself produce the determining effect on relative stability of isomer complexes, and repulsion of hydrazine substituents from fluorine axial atom produces a smaller effect. It is found that reaction of complex formation with deprotonated hydrazines competes with the reaction of neutral complex formation