Solid‐state structures reveal that in bromide 2, directing NH–anion interactions position the bromide ion in an η1‐type fashion over but not in the center of the aromatic ring. The same directing forces are effective in corresponding tribromide salt 3. In the crystal, the bromide ion is paneled by four electron‐deficient aromatic ring systems. In addition, compounds 4 and 6, which have triiodide and the
The crystalstructures of simple triphenyl(pentafluorobenzyl)phosphonium salts provide crucial data on the influence of anion size on the molecular structure of bis(pentafluorobenzyl)phosphonium cations containing two adjacent electron-deficient moieties. Whereas the bromide anions interact by anion-π interaction in a 1:1 mode with the pentafluorobenzene unit Z-configured, the bulkier anions iodide
简单的三苯基(五氟苄基)鏻盐的晶体结构提供了关于阴离子大小对含有两个相邻缺电子部分的双(五氟苄基)鏻阳离子分子结构影响的关键数据。溴化物阴离子通过阴离子-π 相互作用以 1:1 模式与五氟苯单元 Z 配置相互作用,而较大的阴离子碘化物、四氟硼酸盐和六氟磷酸盐导致 1:2 镊子状反构型,其中一个阴离子相互作用同时与两个五氟苯单元。当两个缺电子环的空间分离与阴离子的大小相匹配时,阴离子-π 相互作用会引起构象变化,从观察到的较小阴离子的反形式到镊子状的同步形式。
2-Pyridylsilane, processes for producing and using the same
申请人:Sumitomo Chemical Co., Ltd.
公开号:US20020165397A1
公开(公告)日:2002-11-07
The present invention provides a compound which can be purified by conventional acid/base extraction.
There is disclosed 2-pyridylsilane of formula (1):
1
wherein R
1
represents an alkyl group, etc, R
2
and R
3
represent an alkyl group, an alkoxy group, etc, R
4
, R
5
, R
6
and R
7
represent a hydrogen atom, a halogen atom, an alkyl group, etc.
New halogeno-aromatic substituted indolestyryl dyes for optical data recording media
申请人:CLARIANT INTERNATIONAL LTD.
公开号:EP1460110A1
公开(公告)日:2004-09-22
The present invention relates to hemicyanine dyes, in particular halogeno-aromatic substituted indolestyryl dyes, which are useful as dyes in optical layers. The dyes exert high light-fastnesses properties and excellent recording characteristics.
In particular the invention relates to optical layers comprising such dyes, to a method for manufacturing such optical layers and to optical recording media comprising such optical layers.
Simple pentafluorobenzyl‐substitutedammonium and pyridinium salts with different anions can be easily obtained by treatment of the parent amine or pyridine with the respective pentafluorobenzyl halide. Hexafluorophosphate is introduced as the anion by salt metathesis. In the case of the ammonium salt 4, water co‐crystallisation seems to suppress effective anion–πinteractions of bromide with the electron‐deficient