title: Stabilization of Sn2+ in K10Sn3(P2Se6)4 and Cs2SnP2Se6 derived from a basic flux.
abstract: K10Sn3(P2Se6)4 and Cs2SnP2Se6 stabilize the lower oxidation state of Sn(2+). K10Sn3(P2Se6)4 crystallizes in the trigonal space group R3̅ with a = b = 24.1184(7) Å and c = 7.6482(2) Å at 100 K. Cs2SnP2Se6 crystallizes in P21/c with a = 10.1160(4) Å, b = 12.7867(5) Å, c = 11.0828(5) Å, and β = 94.463(3)° at 100(2) K. Electronic absorption spectra revealed band gaps of 1.82 eV for K10Sn3(P2Se6)4 and 2.06 eV for Cs2SnP2Se6. Solid-state magic-angle-spinning (31)P NMR, UV-vis, Raman, and IR spectroscopy and thermal analysis studies of the compounds are reported.
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
authors.forename: In
authors.initials: I
authors.lastname: Chung
authors.forename: Mercouri G
authors.initials: MG
authors.lastname: Kanatzidis