Hybrid Inorganic-Organic Complexes of Zn, Cd, and Pb with a Cationic Phenanthro-diimine Ligand

Diana Temerova, Tai Che Chou, Kristina S. Kisel, Toni Eskelinen, Niko Kinnunen, Janne Jänis, Antti J. Karttunen*, Pi-Tai Chou*, Igor O. Koshevoy*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
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The phosphonium-decorated phenanthro-imidazolyl pyridine ligand, LP+Br, readily reacts with zinc(II) and cadmium(II) bromides to give inorganic-organic zero-dimensional compounds [LP+ZnBr2]2[ZnBr4] (1) and [(LP+)2Cd2Br4][CdBr4] (2), respectively, upon crystallization. These salts are moderately fluorescent in the solid state under ambient conditions (λem = 458 nm, φem = 0.11 for 1; λem = 460 nm, φem = 0.13 for 2). Their emission results from spin-allowed electronic transitions localized on the organic component with the negligible effect of [MBr4]2- and MBr2 units. Contrary to ionic species 1 and 2, lead(II) bromide affords a neutral and water-stable complex [(LP+)2Pb3Br8] (3), showing weak room-temperature phosphorescence arising from spin-orbit coupling due to the heavy atom effect. The emission, which is substantially enhanced for the amorphous sample of 3em = 575 nm, φem = 0.06), is assigned to the intraligand triplet excited state, which is a rare phenomenon among Pb(II) molecular materials.

Original languageEnglish
Pages (from-to)19220–19231
JournalInorganic Chemistry
Issue number48
Early online date22 Nov 2022
Publication statusPublished - 5 Dec 2022
MoE publication typeA1 Journal article-refereed


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