Tetrahedral chalcogeno thiocyanate cluster complexes [Re(4)Q(4)(SCN)(12)](4-) (Q= S, Se, Te): synthesis and crystal structures

The [Re(4)Q(4)(SCN)(12)](4-) (Q = S, Se, Te) anions were obtained by the re actions of neutral molecular clusters Re44QCl8(TeCl2)(4), Q = S, Se, Te, wi th melting KSCN. Crystal structures were determined for the isostructural c ompounds (Ph4P)(4)Re-44S(SCN)(12) (1), (Ph4P)(4)Re4Se4(SCN)(12) (2) and (Ph 4As)(4)Re(4)T4(e)(SCN)(12) (3). Each contains an Re(4)Q(4) cubane-like clus ter core with Re-Re distances in the ranges 2.762(3)-2.768(2) Angstrom (1), 2.799(2)-2.803(2) Angstrom (2) and 2.864(2)-2.877(2) Angstrom (3). The fac es of the Re, units are symmetrically capped by triply bridging chalcogenid e ligands Q(2-) (Q = S, Se, Te). (C) 2000 Elsevier Science Ltd All rights r eserved.