The Crystal and Molecular Structures of Tetraethylammonium [Heptakis(isothiocyanato)lanthanate(III) and -praseodymate(III)]·Benzene, [(C2H5)4N]4[M(SCN)7]·C6H6 (M=La, Pr), in a Unicapped Trigonal Prism Geometry

• Published in: Bulletin of the Chemical Society of Japan Vol. 62; no. 6; pp. 2078 - 2080
• Main Authors: Matsumoto, Fumiko, Takeuchi, Toshio, Ouchi, Akira
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.06.1989; Chemical Society of Japan
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Metal complexes; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Praseodymium Complexes; Organic cation; Molecular structure; Anionic complex; Lanthanide Compounds; Transition metal Complexes; Experimental study; Lanthanum Complexes; X ray diffraction; Inorganic compound; Crystalline structure
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.62.2078

The crystals of the title new lanthanum(III) complex, LaC45H86N11S7, F.W. 1144.59 are orthorhombic space group Bm21b, a=17.438(7), b=21.507(9), c=16.616(6) Å, U=6232(4) Å3, Dm=1.21(3), Dx=1.22 g cm−3, and μ(Mo Kα)=9.63 cm−1. The central lanthanum(III) atom has a unicapped trigonal-prism 7N-hepta-coordination geometry: seven thiocyanato nitrogen atom are ligated. There are no bridgings between the complexes and/or counter cations. Each benzene molecule is surrounded by the thiocynate ions and ethyl groups of the cations. Although these crystals lose benzene at about 60 °C, they are stable for more than several weeks ambient temperature, and can be regarded as a kind of inclusion compound. The isomorphous praseodymium(III) complex was also obtained.