Synthesis and aggregation phenomena of multifunctional Schiff bases and Ni(II) complexes: an X-ray investigation

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• 作者：Pucci ; Daniela ; Bellusci ; Anna ; Crispini ; Alessandra ; Ghedini ; Mauro ; La Deda ; Massimo
• 关键词：Schiff bases ; Ni(II) ; Self-assembly
• 刊名：Inorganica Chimica Acta
• 出版年：2004
• 出版时间：January 30, 2004
• 年：2004
• 卷：357
• 期：2
• 页码：495-504
• 全文大小：402 K

文摘

Multifunctional Schiff base ligands Lⁿ, namely the tetradentate N,N^′-bis[2-hydroxy-5-(azopyridine)benzylidene]propylendiamine and the bidentate N-dodecyl-5-(azopyridine)salicylaldimine, both containing a flexible azo spacer, a metallation site and a terminal pyridine group, were synthetised and fully characterised. Mesogenic structures, analysed by polarised optical microscopy, DSC and powder X-ray diffraction, were obtained from self-assembly of the mono or bifunctional hydrogen-bond acceptors Lⁿ with carboxylic acid donors. Ni(II) mono and bis-chelate, four- and six-coordinated, Lⁿ derivatives were synthetised. The octahedral structure of the [Ni(py)₂(L²)₂] complex was confirmed by single crystal X-ray analysis. H-bonded self-assembly of Ni(II) complexes and carboxylic acids results in the formation of supramolecular networks whose structure and thermal stability were studied by DSC and powder X-ray diffraction analysis at variable temperatures.