title: Anion-cation charge-transfer properties and spectral studies of [M(phen)3][Cd4(SPh)10] (M = Ru, Fe, and Ni).
abstract: Three anion-cation compounds 1-3 with formula [M(phen)(3)][Cd(4)(SPh)(10)]·Sol (M = Ru(2+), Fe(2+), and Ni(2+), Sol = MeCN and H(2)O) have been synthesized and characterized by single-crystal analysis. Both the cations and anion are well-known ions, but the properties of the co-assembled compounds are interesting. Molecular structures and charge-transfer between the cations and anions in crystal and even in solution are discussed. These compounds are isomorphous and short inter-ion interactions are found in these crystals, such as π···π stacking and C-H···π contacts. Both spectroscopic and theoretical calculated results indicate that there is anion-cation charge-transfer (ACCT) between the Ru-phen complex dye and the Cd-SPh cluster, which plays an important role in their photophysical properties. The intensity of the fluorescent emission of the [Ru(phen)(3)](2+) is enhanced when the cation interacts with the [Cd(4)(SPh)(10)](2-) anion. The mechanism for the enhancement of photoluminescence has been proposed.
authors.affiliation: Department of Chemistry and Key Laboratory of Organic Synthesis of Jiangsu Province, Soochow University, Suzhou, 215123, People's Republic of China.
authors.forename: Jian-Bing
authors.initials: JB
authors.lastname: Jiang
authors.forename: Guo-Qing
authors.initials: GQ
authors.lastname: Bian
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Zhang
authors.forename: Wen
authors.initials: W
authors.lastname: Luo
authors.forename: Qin-Yu
authors.initials: QY
authors.lastname: Zhu
authors.forename: Jie
authors.initials: J
authors.lastname: Dai