Complexation of phosphoryl-containing mono-, bi- and tri-podands with alkali cations in acetonitrile. Structure of the complexes and binding selectivity
作者:Vitaly P. Solov’ev、Vladimir E. Baulin、Nadezhda N. Strakhova、Vladimir P. Kazachenko、Vitaly K. Belsky、Alexandre A. Varnek、Tatiana A. Volkova、Georges Wipff
DOI:10.1039/a708245b
日期:——
oxide terminal groups have been synthesised. Stability constants, enthalpies and entropies of their complexation with lithium, sodium and potassium thiocyanates have been determined in acetonitrile at 298 K by a calorimetric titration technique. We find that tri-podands form a variety of complexes [(M+)3L, (M+)2L, M+L and M+L2)], whereas the bi- and mono-podand form only M+L complexes with Li+ and Na+
我们目前对具有高络合能力的Li +或Na +阳离子的新型离子载体(L)进行实验和理论研究。四个三对数(R 1 –O–C 2 H 4 –)3 N [R 1 = –CH 2 –P(O)Ph 2(P1),–C 2 H 4 – P(O)Ph 2(P2 ),- o -C 6 H 4 P(O)Ph 2(P3)和-o -C 6 H 4 -CH 2 -P(O)Ph 2(P4)],一个双二元(R 2–O–C 2 H 4 –)2 N–CH 3 [R 2 = -o -C 6 H 4 –CH 2 –P(O)Ph 2(P5)]和一个单键[R 2 –O–已经合成了包含氧化膦末端基团的(CH 2 -CH 2 -O)3 -R 2(P6)]。已通过量热滴定技术在乙腈中于298 K下测定了其与硫氰酸锂,钠和钾的络合物的稳定性常数,焓和熵。我们发现三对数形成各种复合物[(M +)3 L,(M +) 2 L,M + L和M +