Clathrates of novel ethylenediamine derivatives: thermal, X-ray crystallographic and conformational analysis of inclusion complexes of N,N′-bis(5-phenyl-5-dibenzo[a,d]cycloheptenyl)ethylenediamine and its 10,11-dihydro analogue
作者:Benita Barton、Richard Betz、Mino R. Caira、Eric C. Hosten、Cedric W. McCleland、Pieter L. Pohl、Benjamin Taljaard
DOI:10.1016/j.tet.2016.10.007
日期:2016.11
Novel compounds N,N′-bis(5-phenyl-10,11-dihydro-5-dibenzo[a,d]cycloheptenyl)ethylenediamine 3a and N,N′-bis(5-phenyl-5-dibenzo[a,d]cycloheptenyl)ethylenediamine 3b are efficient hosts, forming clathrates upon recrystallization from a wide variety of organic solvents. The 1:2 and 1:1 complexes of 3a and 3b, respectively, with dichloromethane, dibromomethane and diiodomethane were subjected to extensive
新型化合物N,N'-双(5-苯基-10,11-二氢-5-二苯并[ a,d ]环庚烯基)乙二胺3a和N,N'-双(5-苯基-5-二苯并[ a,d] ]环庚烯基)乙二胺3b是有效的主体,当从多种有机溶剂中重结晶时,形成包合物。3a和3b的1:2和1:1复合体分别用二氯甲烷,二溴甲烷和二碘甲烷进行了广泛的热和X射线晶体学研究,发现热稳定性较差的配合物的客体位于通道中,而它们却被容纳在更稳定的配合物中的离散腔中。宿主3a在其与CH 2 Cl 2和CH 2 Br 2的配合物中采用相似的构象,而不同的构象子与CH 2 I 2有关。DFT(B3LYP / 6-31G *)几何优化表明,这些构象异构体的稳定性分别比全局最小能量构象异构体3a低8.7和7.5 kJ mol -1。。主机3b在其三个复合物中采用相似的构象,从而优化为全局最小能量构象子。在热更稳定的络合物中,3a和3b以相对较低的能量构象体存在。