1) Lewis basic solvent
Lewis碱性溶剂
1.
Compared with the spectra in neutral solvent such as cyclohexane, the spectra in some Lewis basic solvents were red shifted, and the relative absorption strength ratio of α band to β band decreased.
结果发现 ,两种金属卟啉可以与一些Lewis碱性溶剂发生轴向配位作用 ,形成轴向加合物 ,加合物的紫外可见吸收光谱红移 ,α和β吸收带的相对吸收强度比减小 ;金属卟啉和Lewis碱性溶剂之间的轴向配位作用受溶剂碱性和立体构造的影响 ,碱性强、立体阻碍小的Lewis碱性溶剂 (如正丁胺 )易于与金属卟啉发生轴向配位反应 ,VOOEP/正丁胺体系的等吸收点在 4 12 ,5 39,5 78nm处 ,NiOEP/正丁胺体系的等吸收点在 4 0 8,5 2 7,5 6 8nm处。
2) Lewis basic extractant
Lewis碱性萃取剂
1.
In this paper,the determination of basicity of Lewis basic extractant and its mixture solvent was first proposed on the basis of extraction behavior of HCl and the appropriate stoichiometric ratio of solute to extractant.
目前,萃取剂的基本常数的测定主要集中于酸性磷氧类萃取剂[4～8],且主要采用pH滴定法,有关Lewis碱性萃取剂基本常数的研究尚未见报道。
3) Lewis basic extractant mixture
Lewis碱性混合萃取剂
4) alkaline solvent
碱性溶剂
5) Compound catalyst of lewis acid-lewis base
Lewis酸-Lewis碱复合催化剂
6) Lewis base
Lewis碱
1.
Various zirconia stationary phases were prepared by modification with di-dentate Lewis bases: dodecyl-N,N-diacetic acid(RNCC), dodecyl-N-acetic acid-N-methyleneposphonic acid(RNCP), dodecyl-N,N-dimethylenephosphonic acid(RNPP) and dodecencylsuccinic acid(RCC).
利用其表面存在的大量的 Lewis酸性中心与 Lewis碱性化合物的强烈的酸碱作用可对氧化锆进行吸附改性 。
2.
The developments of the Lewis base-modified zirconia and mixed-oxide containing zirconia as stationary phases for high performance liquid chromatography (HPLC) are reviewed.
综述了Lewis碱改性氧化锆(或其复合氧化物)基质高效液相色谱填料的研究进展,涉及的改性剂包括氟离子、磷酸盐、有机膦酸、羧酸、酚类化合物、蛋白质和环糊精衍生物等。
3.
The capacity to catalyze the Knoevenagel condensation reaction as Lewis base is determined with benzaldehyde and ethylcyanoacetate at the room temperature,the reaction proceeds about 90% at 5-10 min.
6种离子液体均显示出温和的碱性,以其作为Lewis碱催化剂催化苯甲醛和氰基乙酸乙酯的Knoevenagel缩合反应,均在室温下,5~10 min产率即达90%左右,表现出很高的催化活性。
补充资料：碱性溶剂
分子式：
CAS号：
性质：又称亲质子溶剂(protophilic solvent)。这类溶剂与水比较，其接受质子的倾向比水大，它们溶剂化质子比H3O+的酸性弱。乙二胺、液态氨等属于碱性溶剂。
CAS号：
性质：又称亲质子溶剂(protophilic solvent)。这类溶剂与水比较，其接受质子的倾向比水大，它们溶剂化质子比H3O+的酸性弱。乙二胺、液态氨等属于碱性溶剂。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条