LIBABS3 UND LIBAB3S6: ZWEI NEUE QUATERNARE THIOBORATE MIT TRIGONAL-PLANAR KOORDINIERTEM BOR

LiBaBS3 (P21/c; a = 7,577(2) A, b = 8,713(2) A, c = 8,687(2) A, β = 116,22(2)°; Z = 4) und LiBaB3S6 (Cc; a = 15,116(3) A, b = 8,824(2) A, c = 8,179(2) A, β = 117,46(3)°; Z = 4) wurden durch Reaktion stochiometrischer Mengen der Metallsulfide mit Bor und Schwefel bei 750°C dargestellt. Die Anionenteilstruktur des Orthothioborats LiBaBS3 besteht aus isolierten, planaren [BS3]3−-Anionen. Die Kristallstruktur des Metathioborats LiBaB3S6 enthalt [B3S6]3−-Anionen aus B3S3-Sechsringen mit drei exocyclischen Schwefelatomen. Die Metallkationen befinden sich jeweils zwischen den Anioneneinheiten, wobei fur Barium eine neunfache, fur Lithium eine funffache (LiBaBS3) bzw. vierfache (LiBaB3S6) Koordination durch Schwefel beobachtet wird. LiBaBS3 and LiBaB3S6: Two New Quaternary Thioborates with Trigonally Coordinated Boron LiBaBS3 (P21/c; a = 7.577(2) A, b = 8.713(2) A, c = 8.687(2) A, β = 116.22(2)°; Z = 4) und LiBaB3S6 (Cc; a = 15.116(3) A, b = 8.824(2) A, c = 8.179(2) A, β = 117.46(3)°; Z = 4) were prepared by reaction of stoichiometric amounts of the metal sulfides, boron, and sulfur at 750°C. The anionic part of the structure of the orthothioborate LiBaBS3 consists of isolated planar [BS3]3− anions. The crystal structure of the metathioborate LiBaB3S6 contains [B3S6]3− anions formed by six-membered B3S3 rings with three exocyclic sulfur atoms. The metal cations are situated between the anion units leading to a ninefold sulfur coordination of the barium atoms and to a fivefold (LiBaBS3) and fourfold (LiBaB3S6) coordination of the lithium atoms.