open access

https://hdl.handle.net/2115/81429

A Pt-195 NMR study on zero-magnetic-field splitting and the phosphorescence properties in the excited triplet states of cyclometalated platinum(II) complexes

英語

2020-05-21

Royal Society of Chemistry

Dalton transactions

49(19)

6363-6367

We report the factors governing zero-magnetic-field splitting (zfs) in the lowest-energy electronically excited triplet (T-1) states of cyclometalated platinum(II) complexes, whose zfs energies between the lowest- (phi(1)) and highest-energy spin-sublevels (phi(3)) in the T-1 states (Delta E-zfs) are already known: [Pt(bhq) (dpm)] (1Pt), [Pt(thpy)(acac)] (2Pt), [Pt(ppy)(acac)] (3Pt), cis-[Pt(thpy)(2) (4Pt), and cis-(Pt(ppy)(2)] ( 5Pt), where bhq, dpm, thpy, acac, and ppy are benzo[h]quinoline, dipivaloylmethane, 2-(2-thienyl)pyridine, acetylacetone, and 2-phenylpyridine, respectively. As one of the important findings, we show the relationship between the Delta E-zfs and Pt-195 NMR chemical shifts of the five Pt(II) complexes. The implications of the Delta E-zfs values on the emission properties of the Pt(II) complexes in acetonitrile at 293 K are also discussed. In particular, we demonstrate that the radiative rate constants of the Pt(II) complexes correlate with both Delta E-zfs and Pt-195 NMR chemical shifts.

学術雑誌論文

Accepted Manuscript

1477-9226