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Description:
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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 . |