Synthesis, characterization and crystal structure of a 6,8,15,17-tetramethyldibenzo[b,i][1,4,8,11]tetraaza[14]-annulene yttrium(III) complex

摘要

In this study, the sandwich complex of tmtaa, Y(tmtaa)(Htmtaa).2THF (H(2)tmtaa = 6,8,15,17-tetramethyldibenzo [b.f][1.4,8,11]tetraaza[14]annulene, THF = tetrahydrofuran) was synthesized and characterized by IR, UV, mass and NMR spectra as well as DSC measurement. The crystal structure of the complex was determined by S-ray crystal diffraction. The yttrium(III) is coordinated though 8 nitrogen atoms of a dianionic macrocyclic ligand. tmtaa, and of an anionic macrocyclic ligand: Htmtaa, to form an octacoordinated complex which has a sandwich structure. The average bond lengths of Y-N for tmtaa and Htmtaa are 2.40(2) and 2.47(2) Angstrom, respectively. The distances of the yttrium to the planes of the 4 nitrogen atoms for tmtaa and Htmtaa are 1.44(2) and 1.51(2) Angstrom, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 33]