Trigonal Bipyramidal M2Ch32- (M = Sn, Pb;Ch = S, Se, Te) and TlMTe33- Anions: Multinuclear Magnetic Resonance, Raman Spectroscopic, and Theoretical Studies, and the X-ray Crystal Structures of (2,2,2-crypt-K+)3TlPbTe 33--·2en and (2,2,2-crypt-K+) 2Pb2Ch

The series of group 14 metal trigonal bipyramidal anions has been extended to the mixed group 13/group 14 metal TlMTe3^3- anions (M = Sn, Pb), obtained by the reaction of Tl2M2Te3 and K2Te in en or in en/ethylamine mixtures and a stoichiometric excess of 2,2,2-crypt with respect to K⁺. The thallium anions were characterized in solution by ¹¹⁹Sn, ²⁰⁵Tl, ²⁰⁷Pb, and ¹²⁵Te NMR spectroscopy. The small magnitudes of the relativistically corrected …