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Abstract:The electronic effect of substituting CH with N in poly(pyrazoly1)-borato ligands and their transition-metal complexes is shown to be a decrease in energy of the filled metal and ligand orbitals. This conclusion is based on the cyclovoltammograms and photoelectron spectra of bis(hydrotris(azoly1)borato)-iron(") and -cobalt(It) complexes (azolyl = pyrazolyl and 1,2,4-triazolyl) spectra of bis(hydrotris(l,2,4-triazolyl)-borato)iron(rI) show that there is a finetuning of the HOMO-LUMO gap by a shift in transition temperature for the spin and on MO calculations. "Fe Mossbauer

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