-011Production and Decomposition of (NH 4 ) [BF 4 ] and H 3 N-BF 3 .Single crystals of (NH 4 )[BF 4 ] (I) are prepared by reaction of elemental B and NH 4 F·HF in the ratio 1:2 (sealed Cu ampules, 300 • C, 4 weeks). H 3 N·BF 3 (II) is obtained from NH 3 and BF 3 at -110 • C. As revealed by single crystal XRD, (I) crystallizes in the orthorhombic space group Pnma with Z = 4. The structure is built up from isolated (NH 4 ) + and [BF 4 ] − tetrahedra. The colorless compound (II) crystallizes in the orthorhombic space group Pbca with Z = 8 and contains isolated H 3 ·BF 3 molecules in staggered conformation. The thermal behavior of both compounds is described.

The first basic mercurous tetrafluoroborate, Hg 2 (OH) [BF 4 ], was obtained through a synproportionation reaction of red mercuric oxide, HgO, and elemental mercury in a 35% solution of HBF 4 in water as colourless single crystals. The crystal structure (orthorhombic, Pbca, Z ϭ 8, a ϭ 985.0(1), b ϭ 991.0(1), c ϭ 1141.0(2) pm) contains [(HO) 1/2 ϪHgϪHgϪ(OH) 1/2 ] ϩ zig-zag

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From the reaction of PtCl 2 (hex) (hex = hexa-1,5diene) with LiC 6 F 5 in diethyl ether, the complex [Pt{CH(CH 2 C 6 F 5 )CH 2 CH 2 CH=CH 2 }(C 6 F 5 )(OH 2 )] (1) was isolated. The crystal structure (monoclinic, C2/c (no. 15), Z = 8, a = 15.241(3), b = 16.579(2), c = 16.225(2) A Ê , b = 111.12(2)°) shows a complex with square planar coordination around platinum with a template formed 1-pentafluorophenylhex-5-en-2-yl ligand, and C 6 F 5 and aqua ligands trans to the double bond and alkyl carbon, respectively.

Reactions of PtCl 2 (cod) (cod = cycloocta-1,5-diene) with 2,4,6-trifluoro-and 2,3,4,5-tetrafluoro-phenyllithium in diethyl ether gives Pt(C 6 H 2 F 3 -2,4,6) 2 (cod) (1) (monoclinic, P2 1 /n, Z = 4, a = 7.141(1), b = 15.002(2), c = 17.071(3) A Ê , b = 91.37(2)°) and Pt(C 6 HF 4 -2,3,4,5) 2 (cod) (2) (triclinic, P 1, Z = 2, a = 10.150 (2), b = 10.762(2), c = 10.812(2) A Ê , a = 63.606(3), b = 63.327(3), c = 76.496(3)°)respectively, which have two ipso carbon atoms and two double bond midpoint centres in a square planar arrangement, and aromatic rings angled near perpendicular to the coordination plane.Zwei Platindien-Synthesereagentien Pt(C 6 H 2 F 3 -2,4,6) 2 (cod) und Pt(C 6 HF 4 -2,3,4,5) 2 (cod) Inhaltsu È bersicht. Die Umsetzungen von PtCl 2 (cod) (cod = cycloocta-1,5-dien) mit 2,4,6-Trifluoro-bzw. 2,3,4,5-Tetrafluoro-phenyllithium in Diethylether fu È hrt zu Pt(C 6 H 2 F 3 -2,4,6) 2 (cod) (1) (monoklin, P2 1 /n, Z = 4, a = 7,141(1), b = 15,002(2), c = 17,071(3) A Ê , b = 91,37(2)°) und Pt(C 6 HF 4 -2,3,4,5) 2 (cod) (2) (triklin, P 1, Z = 2, a = 10,150 (2), b = 10,762(2), c = 10,812(2) A Ê , a = 63,606(3), b = 63,327(3), c = 76,496(3)°). In beiden Strukturen liegt eine quadratischplanare Koordination mit zwei ipso-Kohlenstoffatomen und zwei Mittelpunkten von Doppelbindungen vor. Die aromatischen Ringe stehen nahezu senkrecht auf der Koordinationsebene.