Optical and spectroscopic properties of substituted oxa- and thiazole luminophores metalated with platinum metals
Optics and Spectroscopy (English translation of Optika i Spektroskopiya), ISSN: 0030-400X, Vol: 114, Issue: 5, Page: 756-761
2013
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Article Description
The cyclometalated [M(pbo)En]PF(M = Pd(II), Pt(II)), [M(pbo)En]PF (M = Rh(III), Ir(III)), and [Rh(C-N) En]PF ((C-N) are the deprotonated forms of 2-phenylbenzoxazole (pbo), 2,5-diphenyloxazole (dpo), 2-phenylbenzothiazole (pbt), 2-biphenyl-4-yl-5-phenyloxazole (bpo), and 2-biphenyl-4-yl-6- phenylbenzoxazole (bpbo) and En is ethylenediamine) complexes are studied by H NMR spectroscopy, IR spectroscopy, and electronic absorption and emission spectroscopy. Metalation of luminophores leads to the formation of five-membered {M(C-N)} cycles in the composition of plane-square and octahedral complexes of the cis-C,C structure. In addition to the intraligand (IL) π-π*optical transitions in the UV region, the complexes are characterized by long-wavelength metal-to-ligand charge-transfer (MLCT) absorption bands in the region of 366-416 nm. The phosphorescence of the complexes in the visible region (482-531 nm) is attributed to radiative transition from the mixed IL/MLCT electronically excited state. The temperature quenching of the phosphorescence of complexes is attributed to the thermally activated population of metal-centered electronically excited states with subsequent nonradiative deactivation. © 2013 Pleiades Publishing, Ltd.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84878479677&origin=inward; http://dx.doi.org/10.1134/s0030400x13040103; http://link.springer.com/10.1134/S0030400X13040103; http://link.springer.com/content/pdf/10.1134/S0030400X13040103; http://link.springer.com/content/pdf/10.1134/S0030400X13040103.pdf; http://link.springer.com/article/10.1134/S0030400X13040103/fulltext.html; https://dx.doi.org/10.1134/s0030400x13040103; https://link.springer.com/article/10.1134/S0030400X13040103
Pleiades Publishing Ltd
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