INOR 171 |
| Our research groups have been examining the transition metal and f-element coordination chemistry of 3,5-dialkyl substituted trispyrazolylborate, Tp-, and trispyrazolylmethane, Tpm, ligands. Emphasis has been placed upon utilization of bulky tert-butyl substituted pyrazole derivatives (low coordination number metal complex stabilization) and water soluble sulfonate derivatives (histidine binding site metalloenzyme mimics). In the course of these investigations we became independently interested in incorporation of the related 3,5-dialkyl substituted tristriazolylborate ligands, (TtzR,R')-, as an alternative supporting environment. The presence of the third nitrogen atom in the heterocycles may provide a ligand system with modified electronics yet negligible steric changes. The modification from Tp- to Ttz- provides additional coordination sites beyond those typically coordinating k3 to metals. Preliminary evidence suggests complexes may show water solubility and stability, and selection of alkyl substituents may provide controlled formation of products ranging from monometallic to multimetallic to coordination polymer complexes. Herein we report the synthesis and characterization of a series of dialkyl substituted triazoles, HTzR,R', including the asymmetrically substituted variant 3-tert-butyl-5-methyltriazole, HTztBu,Me. Preparation of corresponding potassium hydridotris(3,5-dialkyl-triazolyl)borates KTtzR,R' as well as coordination to both late transition metal and lanthanide ions, with emphasis on the bulky hydridotris(3-tert-butyl-5-methyltriazolyl)borate, (TtztBu,Me)- ligand, will be presented. |
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Coordination Chemistry: Synthesis
7:00 PM-10:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Sci-Mix
Division of Inorganic Chemistry |