Temperature and magnetic field dependence of the electronic excitations in the nickel chain compound NINO
Date of Award
Honors Thesis (Open Access)
Colby College. Chemistry Dept.
Temperature and magnetic field dependent absorbance spectra were taken on the Ni2+ chain compound NINO (Ni(C?H??N?)?NO?(ClO?)) in the range from 8,500 to 25,000 cm-?. The identification of an effective C?v symmetry about the nickel ions is supported by assignment of the low temperature absorbance bands. The intensity of many bands is found to be temperature dependent, and in several bands, a shift to higher energy is observed at lower temperatures. A correlation is noted between the field dependence of the spin forbidden electronic transitions and the magnetic properties of NINO. Below a crossover magnetic field, Hc ? 10 T, the absorbance is nearly constant; above Hc, the intensity of the spin forbidden transitions decreases linearly with increasing field. A qualitative explanation for the suppression of the spin forbidden transitions above Hc is suggested.
Electronic excitation, Absorption spectra
Recommended CitationLaViolet, Lucas, "Temperature and magnetic field dependence of the electronic excitations in the nickel chain compound NINO" (2008). Honors Theses. Paper 142.
Colby College theses are protected by copyright. They may be viewed or downloaded from this site for the purposes of research and scholarship. Reproduction or distribution for commercial purposes is prohibited without written permission of the author.