free bases meaning in English

游离碱类

Research and development of sn - ag - sb lead - free based solders
系列合金的研究与开发
The results showed that a function of length of the side chain has a dramatic effect on mesophase formation in the porphyrin free base and complex
最后，研究了酚氧基（ rcg ）中烷基一）碳链长度对叶琳及金属锌叶琳配合物材料液晶性能的影响。
Meso - tetra ( 4 - acyloxyphenyl ) pophyrin was prepared by usual procedure from acyl chloride and meso - tetra ( 4 - hydroxyphenyl ) porphyrin in benzene and obtained in 86 . 4 % yield . treatment of the free base with zinc chloride in dimethyl formamide ( dmf ) - dichloromethane ( ch2cl2 ) yielded corresponding zinc porphyrin complex . the spectral data ( uv - visjr / h - nmr ) and elemental analysis are in agreement with the assigned structures
在合成工作基础上，采用紫外可见光谱( uv - vis ) 、红外光声光谱( ftir - pas ) 、核磁共振氢谱( ~ 1hnmr ) 、元素分析、摩尔电导等手段研究了卟啉及金属卟啉材料的组成及结构。