Luminescence as a probe of phase changes in transition metal complexes
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Date
2005
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Abstract
Precise determination of phase transitions by x-ray analysis requires doses which can cause lattice damage. An alternative initial probe is feasible with radioluminescence temperature measurements, as the spectra, intensity and luminescence lifetimes can all alter discontinuously at a phase transition. The method reduces the total dose by ̃104. Sensitivity to surface contaminants is also possible, as in the case of powder analysis with X-rays. The success of the method has been demonstrated with two compounds, (a) HgI 2{NC5H4C(O)NH2} and (b) Mn(H 2O)6 (O-C6H4NO2) 2, where transitions were recorded at 120 and 230K for (a) and at 110, 145, 205 and 275K for (b). © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.