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A functional model for lanthanide doped silicate materials: synthesis of an apically substituted samarium silsesquioxane complex

Arnold, P. L., Blake, A. J., Hall, S. N., Ward, Benjamin David and Wilson, C. 2001. A functional model for lanthanide doped silicate materials: synthesis of an apically substituted samarium silsesquioxane complex. Dalton Transactions (4) , pp. 488-491. 10.1039/B009123P

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Abstract

Steric protection of a trisilanol silsesquioxane (also referred to as a silasesquioxane) by one TBDMS group (SiMe2But) generated a new siloxanolate ligand, (c-C5H9)7Si7O9(OH)2(OTBDMS) 1, that allows only restricted access to a co-ordinated metal. Lithiation afforded the stable complex (c-C5H9)7Si7O9(OLi)2(OTBDMS), which has allowed the generation of a samarium adduct [Sm(OC6H3But2-2,6){(c-C5H9)7Si7O9(O)(OLi)(OTBDMS)}2]. A structural study of this samarium adduct revealed two unusual features: an absence of stabilising M–O interactions with the siloxane core, and retention of one apical aryloxide group at the trivalent metal, through which the chemistry of a silica-functionalised Ln3+ ion might be modelled. X-Ray crystallography also revealed the dimeric hydrogen bonded structure of the disilanol ligands. The disilanol ligand 1 may also readily be converted into a dithallium salt, providing a potential precursor for further f-element derivatives of this disilanolate moiety.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1364-5447
Last Modified: 04 Jun 2017 02:08
URI: http://orca.cf.ac.uk/id/eprint/9706

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