Synthesis and characterization of oxovanadium(IV), vanadium(IV) and oxovanadium(V) complexes of tetradentate Schiff bases. Attempted preparation of vanadium-carbon bonded compounds through desilylation

摘要

Condensation of 1,3-diaminopropane-2-ol with diacetylmonoxime, acetylacetone, salicylalde-hyde and orthohydroxyacetophenone yielded the tetradentate Schiff bases N,N'-(2-hydroxy) propylenebis{(2-imino-3-oximino)butane} (H_2dampnol), N,N'-(2-hydroxy)propylenebis (acetylacetoneimine) (H_2acacpnol), N,N'-(2-hydroxy)propylenebis-(salicyalaldimine) (H_2salpnol) and N,N'-(2-hydroxy)propylenebis(7-methylsalicylaldimine) (H_2ohacpnol), respectively. The ligands form complexes with oxovanadium(IV), vanadium(IV) and oxovanadium(V) salts. Some mixed ligand complexes involving sigma-bonded phenyl and benzyl radical along with tetradentate ligand, H_2L (where, H_2L stands for H_2dampnol, H_2acacpnol, H_2salpnol or H_2ohacpnol) of the types [(L)V(C_6H_5)_2]CH_3OH and [(L)V(CH_2Ph)_2]CH_3OH have been synthesized, characterized and also provide the syntheses of some new organovanadium(IV) complexes. Silylation coupled with desilylation have been employed as a route to new organovanadium(IV) complexes. All the complexes have been characterized with the help of elemental analyses, molar conductance values, molecular weights, magnetic moments and spectroscopic (IR, UV-Vis, ESR) data.