Download or read book Electron Spin Resonance Studies of Luminescent Transition Metal Complexes written by M. Keith DeArmond and published by . This book was released on 1973 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonradiative transitions in transition metal complexes are discussed. Emission and absorption spectra presented for (d3)Cr(+3) and (d6)Rh(+3), Ir(+3) and Ru(+2) complexes permit classification of the emission as localized orbital (d-d) or delocalized orbital. Quantum, yield, lifetime data and high resolution spectra for localized orbital complexes indicate that phosphorescence is the dominant type emission. Delocalized orbital emitters (d6 here) behave as Pi electron hydrocarbon emitters. The general Robinson-Frosch theory of nonradiative transitions that considers the nonradiative rate constant to be a product of an electronic factor and a vibrational factor can be used as the delocalized orbital emitters and are dominated by the heavy atom spin orbital coupling. The localized orbital emitters require addition of the Jortner-Freed model of weak and strong coupled surfaces to rationalize the vibrational factors.