Complexes of some rare earth metal ions of the mesogenic Schiff-base, N,N鈥?/span>-di-(4鈥?octyloxybenzoatesalicylidene)-l鈥?8鈥?diamino-3鈥?6鈥?dioxaoctane: Synthesis and spectral studies

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• 作者：Sanyucta Kumari ; ^{sanyucta9@yahoo.com} ; Angad Kumar Singh ; T.R. Rao
• 关键词：Schiff-base ; Mesogenic ; Zwiterionic Coordination ; Mono-capped octahedron ; NMR and IR spectra
• 刊名：Materials Science and Engineering ; C
• 出版年：2012
• 期刊代码：63_09284931
• 类别：ms
• 出版时间：1 July, 2012
• 卷：32
• 期：5
• 页码：1146-1151
• 文件大小：685 K

摘要

A mesogenic Schiff-base, N,N鈥?/em>-di-(4鈥?octyloxybenzoatesalicylidene)-l鈥?8鈥?diamino-3鈥?6鈥?dioxaoctane; H₂dobsdd (H₂L³), that nematogenic mesophase was synthesized and its structure studied by elemental analysis and FAB mass, NMR and IR spectra. The Schiff-base, H₂L³, upon condensation with hydrated lanthanide(III) nitrates, yields Ln^III complexes of the general composition [Ln₂(L³H₂)₃(NO₃)₄](NO₃)₂, where Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Ho. The IR and NMR spectral data imply a bi-dentate of the Schiff-base through two phenolate oxygens in its zwitterionic form (as L³H₂) to the Ln^III ions, rendering the overall geometry of the complexes to seven-coordinated polyhedron 鈥?possibly distorted mono-capped octahedron. Among the metal complexes, only that of La^III and Gd^III are found to be mesogenic.