화학공학소재연구정보센터
Inorganic Chemistry, Vol.55, No.12, 5836-5844, 2016
Synthesis, Structure, and Photophysical Properties of Mo-2(NN)(4) and Mo-2(NN)(2)((TPB)-P-i)(2), Where NN = N,N'-Diphenylphenylpropiolamidinate and (TPB)-P-i=2,4,6-Triisopropylbenzoate
Two &molybdenum compounds featuring amidinate ligands with a. C C bond, Mo-2(NN)(4) (I), where NN = N,N'-diphenylphenylpropiolamidiriate, and trans-Mo-2(NN)(2)(7PB)(2) (II), where (TPB)-P-i = 2,4,6-triisopropylbenzoate, have been prepared and structurally characterized by single-crystal X-ray crystallography. Together with Mo-2(DAniF)(4) (III), where DAMF = N,N'-bis(p-anisyl)formamidinate, all three compounds have been studied with steady-state UV vis, IR, and time-resolved spectroscopy methods. I and II display intense metal to ligand charge transfer (MLCT). Singlet state (S-I) lifetimes of I III are determined to be 0.7, 19.1, and 2.0 ps, respectively. All three compounds have long-lived triplet state (T-i) lifetimes around 100 ys. In femtosecond time-resolved infrared (fs-TRIR) experiments, one v(C C) band is observed at the S-I state for I but two for II, which indicate different patterns of charge distribution. The electron would have to be localized on one NN ligand in I and partially delocalized over two NN ligands in II to account for the observations. The result is a standard showcase of excited-state mixed valence in coordination compounds.