You are here: Home :: Area NEM :: Chemistry :: Inorganic chemistry

R. Blachnik, Hans Reuter, Th. Wiest, H. Eickmeier

Crystal structures and DSC investigations of trimethylphenylammonium perchlorate, trimethyl-phenylammonium tetrafluoroborate, methyltriphenyl-phosphonium perchlorate, and methyltriphenyl-phosphonium tetrafluoroborate, [Me₃PhN][ClO₄]

[Me₃PhN][ClO₄], [Me₃PhN][BF₄], [MePh₃P] [ClO₄], and [MePh₃P][BF₄] were synthesized and their structures and thermodynamic data of transitions were determined. [Me₃PhN][ClO₄]: P2₁/c, a= 852.7(3) pm, b= 580.9(2) pm, c=2260.1(8) pm, β =96.65(3)° and Z= 4. [Me₃PhN][BF₄]: P2₁2₁2₁, a= 584.82(8) pm, b= 835.04(8) pm, c=2258.5(2) pm, and Z=4. [MePh₃P]·[ClO₄]: P2₁/c, a= 1491.0(3) pm, b= 1378.6(1) pm, c= 1791.6(2)pm, β = 90.66(1)° and Z= 8. [MePh₃P] ·[BF₄]: P2₁/c, a=1487.4(2)pm, b= 1377.5(1)pm, c= 1768.7(1)pm, β = 91.00(1)° and Z= 8.
Two solid-solid phase transitions were detected in DSC for both trimethylphenylammonium compounds. Modification III of [Me₃PhN][BF₄] and the modification II of [Me₃PhN][ClO₄] are isotypic. The latter phase has lattice parameters of a= 2260.6(7) pm, b= 852.7(3) pm, and c= 586.3(2) pm at 373 K. No phase transitions were observed in the phosphonium compounds in the range 153-600 K.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 215, 01/2000
Pages: 52

Journal homepage (external site)

Show all available items of this journal

 

Area NEM