Novel carbamate compounds, novel silylcarbamate compounds and novel reversed phase materials comprising a silica substrate modified with a modified novel silylcarbamate compound are disclosed which may, for example, be used as stationary phases for liquid chromatography applications. Attached to the carbamate group are several reversed or normal phase producing groups such as cyanoalkyl, tertiary butyl, dibutyl, octyl, dodecyl, tetradecyl, octadecyl or benzyl. The new stationary phases may be endcapped with a short chain alkyl silane. One particular advantage of these stationary phases is decreased interaction with basic samples due to shielding of the unreacted silanol groups on the silica surface. The new phases are particularly useful in the chromatographic analysis of basic samples or more generally for samples having an undesirable interaction with the unmodified silanols.
揭示了新型
碳酸酯化合物、新型
硅基
碳酸酯化合物和新型反相材料,其中包括用修改后的新型
硅基
碳酸酯化合物改性的
硅基底物,可以用作
液相色谱应用的固定相。与
碳酸酯基团相连的是几个反向或正向相产生基团,如
氰烷基、三丁基、二丁基、辛基、
十二烷基、
十四烷基、
十八烷基或苄基。新的固定相可以用短链烷基
硅烷进行端基封闭。这些固定相的一个特点是与碱性样品的相互作用减少,因为
硅基表面上未反应的
硅烷醇基团被屏蔽。新相在
色谱分析中特别适用于碱性样品或更一般地用于与未改性
硅烷醇发生不良相互作用的样品。