Luminescence spectroscopy and emitting-stark properties of Pd(SCN)(4)(2-) in crystals

Luminescence from K2Pd(SCN)(4), [K( 18-crown-6)](2)Pd(SCN)(4), and (2-dieth ylammonium N-(2,6-dimethylphenyl)acetamide)(2)Pd(SCN)(4) is observed betwee n 10000 and 14500 cm(-1) (1000 and 690 nm) at temperatures below 100 K. Lum inescence lifetimes of up to 4.15 ms are measured at 10 K. The spectra show resolved vibronic progressions with average energy intervals of 278 and 15 0 cm(-1). The average Stokes shift determined from the luminescence and exc itation spectra is 4100 cm(-1). Average dimensionless emitting-state distor tions Delta of 3.75 and 1.7, corresponding to Huang-Rhys parameters S of 7. 0 and 1.5, along the two modes are obtained from calculated luminescence sp ectra.