2,4,6-Trifluoro-1,3,5-trimethyl-2,4,6-triphenylcyclotrisilazane

Abstract

C21H24F3N3Si3, Mr=459.7, trigonal, R3, a = 8.589 (2) A, ct = 102.53 (2) °, U = 580.2 A 3, z = 1, D x = 1.316 Mg m-3; final R = 0.055 for 459 reflexions. The molecule has a crystallographic threefold axis. The central Si3N 3 ring is almost planar with Si-N = 1.700 (6)A, and internal angles of 110.1 (5) and 129.8 (5) ° at Si and N. Abstract. C26H2002, Mr=364, monoclinic, P2Jn,

Difluorosilanediyl-1,1'-bis(2,2,4,4,6,6-hexamethylcyclotrisilazane)

“…A similar boat conformation was found for (SiMe2.NSiMe3)3 (Adamson & Daly, 1970), while almost planar Si3N 3 rings have been reported for (SiMe2.NH) 3 in the gas phase (Rozsondai, Hargittai, Golubinskii, Vilkov & Mastyukov, 1975) and for (PhSiF. NMe) a (Clegg, Noltemeyer, Sheldrick & Water, 1980). In contrast to Si2N2 four-membered rings, which are always virtually planar (Clegg, Hesse, Klingebiel, …”

Struktur von 3,5-Diamino-2,2,6,6-tetramethyl-4-phenoxy-1-oxa-3,5-diaza-4-phospha-2,6-disilacyclohexan-4-sulfid

“…Entsprechendes gilt fiir Si-N-Si-Winkel in einigen Silazanen (man vergleiche z.B. : Clegg, 1980;Clegg, Noltemeyer, Sheldrick & Vater, 1980;GlideweU & Holden, 1981). Die intramolekularen Kontaktabstfinde zwischen exozyklischen NH2-Gruppen und Methyl-Gruppen sowie zwischen NH2-Gruppen und Schwefel zeigen ebenfalls, dass die Molekiilgestalt stark dutch sterische Wechselwirkungen bedingt ist: N(2)...C(9) 3,433(11), N(2)... C(10) 3,154 (8), N(4)...C(7) 3,324 (8), N(4)...C(8) 3,251 (10) (3,25*), N(2)... S 3,351 (7), N(4)...S 3,360 (4) (3,35*) ./~.…”

Electronic and optical properties of silicon based porous sheets

“…Therefore, this newly designed nanosheet could be synthesized by polymerization reaction using the synthesized C 21 H 24 F 3 N 3 Si 3 or C 12 H 30 F 3 N 3 Si 3 molecules which contain the hexagonal Si 3 N 3 cores. 33,34 A similar procedure was reported to fabricate the g-C 3 N 3 architectures. 11 To study the electronic properties of the g-Si 3 N 3 sheet, we calculated the electronic band structure and corresponding partial density of states (PDOS).…”