Steric Environment Triggered Self-Healing CuII/HgII Bimetallic Gel with Old CuII–Schiff Base Complex as a New Metalloligand

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• 作者：Kasturi Sarmah ; Gopal Pandit ; Amit Baran Das ; Bipul Sarma ; Sanjay Pratihar
• 刊名：Crystal Growth & Design
• 出版年：2017
• 出版时间：January 4, 2017
• 年：2017
• 卷：17
• 期：1
• 页码：368-380
• 全文大小：1007K
• ISSN：1528-7505

文摘

The present work reports an easy to synthesize Cu^II–Schiff base complex (C-2), in which tunable access of a vacant coordination site for a guest metal via stereoelectronic modulation of a substituent is possible, which might be of great use in the supramolecular self-aggregation process and thus utilized as a metalloligand for the formation of a hetero-bimetallic Cu^II/Hg^II gel in methanol. The gelation property of complex C-2 is found to be dependent upon Hg^II content, and the initial yellow gel transformed into green with a higher equivalent of Hg(OAc)₂. The coordination of Hg^II to complex C-2 is perceived to cause significant charge polarization around the coordinated imine and ultimately lead to corresponding green 2-hydroxy benzaldehyde coordinated Cu^II complex (C-3) after the hydrolysis, which is responsible for yellow to green gel transformation. The role of anions, metal salts, ligand, and solvents on the gelation property of complex C-2 along with the effect of various external chemical stimuli on the gel and its self-sustainability were studied in detail. The as-synthesized hetero-bimetallic Cu^II/Hg^II gel shows an excellent ability as a reusable material for the adsorption of various cationic as well as anionic dyes.