Synthesis, characterization and crystal structure of complexes of thorium(IV) nitrate with n,n,n′,n′,-tetraphenyl-3,6-dioxaoctanediamide

Abstract

The solid powder and crystal complexes of thorium(IV) nitrate with N,N,N′,N′-tetraphenyl-3,6-dioxaoctanediamide (L), having the formula [Th(NO₃)₄(L)] and [Th(NO₃)₄(L)]·2MeCN, respectively, have been prepared and characterized by elemental analysis, molar conductance, IR and ¹H NMR spectra. The latter complex crystallizes in the monoclinic space group P2₁/c, with a 14.156(3), b= 14.595(2), c= 20.723(3)Å, β= 97.27(1)° and Z= 4. The final R= 0.0376 for 1857 independent observed [l 3σ(l)] reflections. The thorium atom is twelve-co-ordinated by oxygen atoms, eight from four bidentate nitrate groups and four from L, forming a distorted icosahedron. The compound L acts as a tetradentate ligand forming a half-ring co-ordination structure. The Th–O bonds average 2.515(5)(carbonyl oxygen), 2.565(5)(nitrate oxygen) and 2.653(5)Å(ether oxygen).