Cluster compounds based on a new {ReMoSe} core were obtained and studied. The polymeric solid K[ReMoSe(CN)(CN)] (1) containing 24 cluster valence electrons (CVE) was isolated as a result of high-temperature reaction. Water-soluble salts K[ReMoSe(CN)]·11HO (2) and Cs[ReMoSe(CN)]·HO (3) were prepared from compound 1. Crystal structures of the diamagnetic compounds 2 and 3 contain a cluster anion [ReMoSe(CN)] with a 22-electronic core {ReMoSe}. Metathesis reaction followed by recrystallization from CHCN yielded paramagnetic salt (PhP)[ReMoSe(CN)]·2CHCN (4) containing the {ReMoSe} core with 21 CVE. Cyclic voltammetry of the solution of 4 displayed three quasi-reversible waves with E = -0.325, -0.818 and -1.410 V vs. Ag/AgCl electrode indicating the presence of [ReMoSe(CN)] transitions. Electronic structure calculations showed that both mer- and fac-isomers of [ReMoSe(CN)] clusters undergo great distortion when the number of CVE decreases.
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