Resorcinol-typecalix[4]arenesbearingfouralkylsidechains ([4]Ar-Rn) have been applied as a liquid surfactant-membrane in the concentration process of Cs+. [4]Ar-Rn formed a highly stable water-in-oil (w/o) emulsion for a mixture of toluene and HCl solution, and the w/o emulsion became a w/o/w emulsion by stirring it in a Cs+ solution. The Cs+ in the outer aqueous solution was transported through
Alkyl chain length and metallic cation effects on the acid-base properties of C-alkylresorcin[4]arenes in aqueous media
作者:Santiago D. Salas、María T. Baumgartner、Alicia V. Veglia
DOI:10.1016/j.molliq.2018.12.140
日期:2019.3
The polyprotic behavior of C-alkylresorcin[4]arenes was investigated in aqueous media in a large interval of pH values by potentiometry and spectrophotometry. The pKa1; pKa2; pKa3 and pKa4 were determined. The pKai values determined by both methods correlate very well. The influence of the alkylic chain length on the bridge carbon of the resorcin[4]arene were determined for C-methylresorcin[4]arene
通过电位滴定法和分光光度法研究了C-烷基间苯二酚[4]芳烃在水性介质中在较大pH值区间中的多质子行为。所述的pK一个1 ; pK a 2 ; 确定了pK a 3和pK a 4。的pK值的AI通过两种方法测定的值相关性非常好。 对于C-甲基间苯二酚[4]芳烃(C1RA),测定了烷基链长度对间苯二酚[4]芳烃的桥碳的影响。C-丁基间苯二酚[4]芳烃(C4RA)和C-庚基间苯二酚[4]芳烃(C7RA)。相对于其他间苯二酚[4]芳烃(3.2)所确定的相似值,在针对C7RA(2.3)所确定的较低pK a 1中观察到了这种作用,并且随着烷基长度的增加,pK a 3的值有所增加。链较长(8.3; 9.9; 10.5),而不会影响pK a 2(6.9)和pK a 4(10.4)。 同样,确定了碱金属离子(Li +,Na +或K +)对C4RA的酸碱常数的影响。第一个和四个解离常数的值在不受碱抗衡离子影响的情况下几乎相同(pK
Mesomorphic properties, microwave-assisted synthesis, and antimicrobial evaluation of novel Schiff base functionalized resorcin[4]arene derivatives
作者:Jinal A. Gajjar、Rajesh H. Vekariya、Vinay S. Sharma、Seema N. Kher、Dhanji P. Rajani、Hitesh M. Parekh
DOI:10.1080/15421406.2020.1856615
日期:2021.1.22
Abstract Schiff bases of Resorcin[4]arenes were synthesized under microwave irradiation in high yield and characterized through various spectroscopic techniques. Mesomorphic behavior of synthesized materials (8a-f) were studied by polarizing optical microscope, differential scanning calorimetry (DSC), and thermal gravimetric analysis. Most of compounds displayed isotropic phase and nematic mesophase