Tl2Ch22- (Ch = Se and/or Te) Anions: X-ray Crystal Structures and Raman Spectra of (2,2,2-crypt-K+)2Tl2Se22- and (2,2,2-crypt-K+)2Tl2Te22- and Solution 77Se, 203Tl, and 205Tl NMR Spectroscopic and Theoretical Studies of Tl2Ch22-, In2Se22-, and In2Te22- †

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