Ditin(IV) Chalcogenide Anions: 77Se, 119Sn, and 125Te Solution NMR Study of the Sn2Ch64- and Sn2Ch74- (Ch = Se, Te) Anions, X-ray Crystal Structures and Raman Spectra of K+(N(CH3)4+)3Sn2Se64-, (enH+)2(2,2,2-crypt-K+)2Sn2Se64-, and (K+)2(2,2,2-crypt-K+)2Sn2Te64-, and X-ray Crystal Structures of K+(2,2,2-crypt-K+)2HOSnTe33- and K+(2,2,2-crypt-K+)2HOSnTe33-·en
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