NDLI: Silver thiolato complexes grafted on silica and dissolved in organic solution

Content Provider	Springer Nature Link
Author	Spennato, Richard Menu, Marie Joëlle Dartiguenave, Michèle Dartiguenave, Yves
Copyright Year	2004
Abstract	The formation of a covalent, stable, silver-thiolato bond was used to compare the coordination of the silver cation with mercaptopropylsilane molecules grafted on silica and dissolved in organic solvents. The characterization of the homemade ≡SiLH trap, performed by DRIFT, $^{29}$Si- and $^{13}$C-CP-MAS-n.m.r., showed the presence of a ligand monolayer on the silica surface. This ligand was characterized by its free S—H function. The coordination of Ag$^{+}$ ions was illustrated by the color change of the surface from white to yellow, the disappearance of the S—H vibration and the downfield shift of the carbon atoms located near the S atom. All these changes were also observed for the silver thiolates synthesized in homogeneous medium. Three molecular complexes were isolated as yellow solids and characterized using physicochemical techniques. Monomeric [HNEt$_{3}$][Ag(NO$_{3}$)L$^{2}$] (1), tetrameric (AgL$^{2}$)$_{4}$ (2) and trimeric (AgL$^{3}$)$_{3}$ (3) species, each with a linearly coordinated silver cation, were proposed. L$^{2}$H, (MeO)$_{3}$Si(CH$_{2}$)$_{3}$SH, and L$^{3}$H, N(C$_{2}$H$_{4}$O)$_{3}$Si(CH$_{2}$)$_{3}$SH, are respectively trimethoxysilyl- and silatranyl- propanethiols. The silver salt and the steric hindrance of the ligand influenced the nuclearity of the molecular silver complexes. Optimization of the ≡SiLH trapping conditions with pH and time indicated that the best trapping of the Ag$^{+}$ cation was performed for pH values 5–7 and 30 min in batch experiments. Safety discharged waters were obtained after percolation through an ≡SiLH filled column. The mercaptopropyl-modified silica gel was regenerated with a 1 M thiourea solution at pH 1.
Starting Page	830
Ending Page	839
Page Count	10
File Format	PDF
ISSN	03404285
Journal	Transition Metal Chemistry
Volume Number	29
Issue Number	8
e-ISSN	1572901X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Inorganic Chemistry

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