Guanidinates: a new class of ligands for dimetal units with multiple metal-metal bonds

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Title: Guanidinates: a new class of ligands for dimetal units with multiple metal-metal bonds
Author: Wilkinson, Chad C.
Abstract: This dissertation concerns the discovery of the ability of the guanidinate ligand hpp (hpp = anion of 1 ,3 ,4 ,6 ,7 ,8 -hexahydropyrimido[1 ,2 -a]pyrimidine ) to stabilize high oxidation states of dimetal units (particularly dimolybdenum species ) and attempts to control solubility and redox potential through modification of the ligand . Two general strategies were used for the ligand modifications : alteration of the ring size , and addition of alkyl substituents . All of the dimetal complexes using these ligands show a significant shift in redox potential compared to other commonly used classes of ligands (i .e . carboxylates and formamidinates ) allowing access to the Mo2 4+ , Mo2 5+ and Mo2 6+ oxidation states . The solubility of the complexes increases with increasing ring size , or with increasing length of the alkyl substituent . The physical and chemical properties of the ligands and their dimolybdenum complexes are described in detail .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1002
Date: 2009-05-15

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Guanidinates: a new class of ligands for dimetal units with multiple metal-metal bonds. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1002 .

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