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The development of optical power limiting materials is important to protectindividuals or materials from intense laser irradiation. The photophysicalbehavior of Os(II) polypyridinyl complexes having aromatic hydrocarbonterpyridyl ligands has received considerable attention as systems exhibitingintramolecular energy transfer to yield a long excited states lifetime. Here wepresent a focused discussion to illustrate the photophysical behavior oftransition metal complexes with modified terpyridyl ligands, utilizing densityfunctional theory. Our DFT studies of the excited state behavior of Os(II)complexes containing pyrene-vinylene derived terpyridine (pyr-v-tpy) ligandscan be applied to the development of optical limiting materials controlling thelaser power at longer wavelength range.

DFT Investigation of Osmium Terpyridinyl Complexes as Potential Optical Limiting Materials