作者:Peter R. Ashton、Matthew C. T. Fyfe、Sarah K. Hickingbottom、J. Fraser Stoddart、Andrew J. P. White、David J. Williams
DOI:10.1039/a802406e
日期:——
The crown ether dibenzo[24]crown-8 (DB24C8) is interpenetrated by a wide range of disubstituted dibenzylammonium cations to generate [2]pseudorotaxane complexes by virtue of, inter alia, hydrogen bonds. 1H NMR spectroscopic measurements indicate that the solution phase binding strengths of the pseudorotaxane complexes can be controlled accurately via judicious manipulation of the substituents attached to the dibenzylammonium cationsâ aryl rings. A linear free energy relationship (LFER) has been found to exist between the complexesâ stability constants (Kas) and the Hammett substituent constants (Ï). X-Ray crystallographic analyses of the pseudorotaxanes reveal that each of their discrete supramolecular units display similar solid state superstructures. However, these analyses also demonstrate that the pseudorotaxanes associate with one another, via a myriad of intersupramolecular packing motifs, to generate a wide range of novel superarchitectures.
冠醚二苯并[24]冠-8(DB24C8)与多种二取代的二苄基铵阳离子相互渗透,通过氢键等作用生成[2]伪紫杉烷络合物。1H NMR 光谱测量结果表明,通过对连接在二苄基铵阳离子芳基环上的取代基进行明智的操作,可以精确地控制伪紫杉烷络合物的溶液相结合力。研究发现,络合物的稳定性常数(Kas)与哈梅特取代基常数(Ï)之间存在线性自由能关系(LFER)。对假轴烷的 X 射线晶体学分析表明,它们的每个离散超分子单元都显示出相似的固态超结构。不过,这些分析还表明,这些假轴烷通过无数的超分子间堆积图案相互关联,从而产生了各种新颖的超结构。
Goss; Ingold; Wilson, Journal of the Chemical Society, 1926, p. 2458
作者:Goss、Ingold、Wilson
DOI:——
日期:——
Ing; Robinson, Journal of the Chemical Society, 1926, p. 1665
作者:Ing、Robinson
DOI:——
日期:——
Ing; Robinson, Journal of the Chemical Society, 1926, p. 1658,1665
作者:Ing、Robinson
DOI:——
日期:——
<i>N</i>-Phenylamidines as Selective Inhibitors of Human Neuronal Nitric Oxide Synthase: Structure−Activity Studies and Demonstration of in Vivo Activity
作者:Jon L. Collins、Barry G. Shearer、Jeffrey A. Oplinger、Shuliang Lee、Edward P. Garvey、Mark Salter、Claire Duffy、Thimysta C. Burnette、Eric S. Furfine
DOI:10.1021/jm980072p
日期:1998.7.1
the amidine nitrogen and phenyl ring to give N-(3-(aminomethyl)phenyl)acetamidine (14) dramatically altered the selectivity to give a neuronal selective nitric oxide synthase (nNOS) inhibitor. Part of this large shift in selectivity was due to 14 being a rapidly reversible inhibitor of iNOS in contrast to the essentially irreversible inhibition of iNOS observed with 13. Structure-activity studies revealed