Mono(acetylacetonato)zirconium(IV) Aryloxides: Synthesis, Reactivity and Thermoanalytical Investigation

Abstract

A series of novel zirconium(IV) complexes, formulated as ZrCl_3−n(acac)(OAr^I–V)_n (where n =− 3; –OAr^I = OC₆H₄Cl-2, –OAr^II = OC₆H₄Cl-4, –OAr^III = –OC₆H₃Cl₂-2,4, OAr^IV = –OC₆H₃Cl₂-2,6 and OAr^V = –OC₆H₂Cl₃-2,4,6) were synthesized by reacting ZrCl₃(acac) with corresponding substituted chlorophenols in separate experiments. The complexes were characterized by elemental analysis, molar conductance measurements, molecular weight determination, spectroscopic techniques (¹HNMR and IR) and thermal gravimetric analysis. Based upon these studies, a triangular bipyramidal structure has been proposed. Acceptor properties of ZrCl₃–_n(acac)(OAr^I–V)_n towards bidentate ligands such as 2,2’-bipyridyl and 1,10-phenanthroline allows the isolation of 1:1 addition compounds as shown by physicochemical, IR, and 1HNMR spectral studies.

Keywords:Zirconium, acetylacetone, chlorophenol, reactivity and thermal analysis