A Schiff Base and Its Copper(II) Complex as a Highly Selective Chemodosimeter for Mercury(II) Involving Preferential Hydrolysis of Aldimine over an Ester Group

详细信息    查看全文

• 作者：Ashish Kumar ; Mrigendra Dubey ; Rampal Pandey ; Rakesh Kumar Gupta ; Amit Kumar ; Alok Ch. Kalita ; Daya Shankar Pandey
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：May 19, 2014
• 年：2014
• 卷：53
• 期：10
• 页码：4944-4955
• 全文大小：736K
• 年卷期：v.53,no.10(May 19, 2014)
• ISSN：1520-510X

文摘

The syntheses of a new Schiff base, diethyl-5-(2-hydroxybenzylidene)aminoisophthalate (HL), and a copper complex, [Cu(L₂)] (1), imparting L^鈥?/b>, have been described. Both the ligand HL and complex 1 have been thoroughly characterized by elemental analyses, electrospray ionization mass spectrometry, FT-IR, NMR (¹H and ¹³C), electronic absorption, and emission spectral studies and their structures determined by X-ray single-crystal analyses. Distinctive chemodosimetric behavior of HL and 1 toward Hg²⁺ has been established by UV/vis, emission, and mass spectral studies. Comparative studies further revealed that the chemodosimetric response solely originates from selective hydrolysis of the aldimine moiety over the ester group and 1 exhibited greater selectivity toward Hg²⁺ relative to HL while the sensitivity order is reversed. Further, these followed different hydrolytic pathways but ended up with the same product analyzed for diethyl-5-aminoisophthalate (DEA). Hg²⁺-induced displacement of Cu²⁺ and subsequent hydrolysis of the 鈭扝C鈺怤鈥?moiety in 1 affirmed the identity of the actual species undergoing hydrolysis as HL. The occurrence of Cu²⁺ displacement and Hg²⁺ detection via hydrolytic transformation has been supported by various physicochemical studies.