Synthesis and characterization of UO2 VI, ZrOIV and VOIV complexes with a 14-membered macrocyclic tetradentate [N4]ligand

School of Chemistry, Sambalpur University, Jyoti Vihar, Burla, Sambalpur-768 019, Orissa, India

E-mail : dhruba_dash@yahoo.co.in

Manuscript received 26 June 2008, revised 26 October 2009, accepted 17 November 2009

A series of macrocyclic complexes of the type [M(L/L')(NO₃)₂].nH₂O and [VO(L/L')(SO₄)].2H₂O, where L is a Schiff base "2,5,9,12-t~traaza-1,6,8,13-tetramethyl-cyclotetr~dec-1,5,8,9,12-tetraene (TTCTI)" and L' is another Schiff base "3,8,14,19-dibenzo-2,5,9,12-tetraaza-1,6,8,13-tetramethyl-cyclotetradec-1,5,8,9, 12-tetraene (DTTDT)", M = UO₂^VI and ZrO^IV, n = 1 or 2 respectively Is obtained by in situ reaction of ethylene diamine/orthophenylene diamine and acetylacetone with the above oxocations. The coordination template effect governs the steric course of the reaction. The complexes are characterized on the basis of eleme1Ual analysis, thermal analysis, molar conductivity, magnetic moment, electronic, Infrared and ¹H NMR spectral studies. The results Indicate that the VO^IV ion is penta coordinated yielding paramagnetic complexes where as UO₂^VI and ZrO^IV Ions are hexa coordinated yielding diamagnetic complexes of above composition.