Exploring the Interaction of Mercury(II) by N2S2 and NS3 Anthracene-Containing Macrocyclic Ligands: Photophysical, Analytical, and Structural Studies

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• 作者：Abel Tamayo ; Bruno Pedras ; Carlos Lodeiro ; Lluis Escriche ; Jaume Casabó ; José ; Luis Capelo ; Berta Covelo ; Raikko Kivek&auml ; s ; Reijo Sillanp&auml ; &auml
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：September 17, 2007
• 年：2007
• 卷：46
• 期：19
• 页码：7818 - 7826
• 全文大小：354K
• 年卷期：v.46,no.19(September 17, 2007)
• ISSN：1520-510X

文摘

The complexation properties toward Hg(II) of six macrocyclic ligands, 3,11-dithia-7,17-diazabicyclo[11.3.1]heptadeca-1(17),13,15-triene (L1), 7-(9-anthracenylmethyl)-3,11-dithia-7,17-diazabicyclo[11.3.1]heptadeca-1(17),13,15-triene (L2),7-(10-methyl-9-anthracenylmethyl)-3,11-dithia-7,17-diazabicyclo[11.3.1]heptadeca-1(17),13,15-triene (L3), 7,7'-[9,10-anthracenediylbis(methylene)]bis-3,11-dithia-7,17-diazabicyclo[11.3.1]heptadeca-1(17),13,15-triene (L4), 1,4,7-trithia-11-azacyclotetradecane (L5), and 11,-(anthracen-9-ylmethyl)-1,4,7-trithia-11-azacyclotetradecane (L6), werestudied. The stoichiometries of the formed species were determined from absorption and fluorescence titrations. Inthese anthracene-containing macrocycles, a fluorescent quenching of the emission was found upon Hg(II) addition.The X-ray crystal structure of [HgCl₂(L2)]·1/2CH₂Cl₂ was determined. The asymmetric unit contains two independent[HgCl₂(L2)] molecules and one dichloromethane molecule. Each Hg(II) ion is coordinated by the pyridine nitrogen,the two sulfur atoms of one L2 molecule, and two chloride ions. Analytical studies using solvent extraction separationof Hg(II) from aqueous solutions were performed to determine the Hg(II) extraction capability of ligands L1, L2,and L5.