918634-17-0Relevant articles and documents
Synthesis and structure of nitrogen bridged calix[5]- and -[10]-pyridines and their complexation with fullerenes
Liu, Shi-Qiang,Wang, De-Xian,Zheng, Qi-Yu,Wang, Mei-Xiang
, p. 3856 - 3858 (2007)
Azacalix[5]pyridine, a heteroatom bridged calixaromatic with an odd number of arene units, and azacalix[10]pyridine, a giant molecular belt, were selectively synthesized based on a 2 + 3 macrocyclic coupling strategy; both novel macrocyclic hosts formed strong 1: 1 complexes with fullerenes C 60 and C70 in a size-selective manner with association constants up to 1.3 × 105 ± 0.03 × 105 M-1. The Royal Society of Chemistry.
Methylazacalixpyridines: Remarkable bridging nitrogen-tuned conformations and cavities with unique recognition properties
Gong, Han-Yuan,Zhang, Xiao-Hang,Wang, De-Xian,Hong-Wei, Ma.,Zheng, Qi-Yu,Wang, Mei-Xiang
, p. 9262 - 9275 (2006)
Methylazacalix[n]pyridines (n = 4, 8) and methylazacalix[m]arene[n] pyridines (m = n = 2, 4) have been synthesized by a convenient fragment coupling approach starting from 2,6-dibromopyridine, 2,6-diaminopyridine, and benzene-1,3-diamine. Thanks to the in
A trimetal chain cocooned by two heptadentate polypyridylamide ligands
Cotton, F. Albert,Chao, Hui,Murillo, Carlos A.,Wang, Qingsheng
, p. 5416 - 5422 (2006)
Compounds of nickel in which a chain of three metal atoms is closely embraced by two interlocking heptadentate dianions derived from a chain of five pyridyl groups linked at the 2, or 2 and 6, positions by four amide nitrogen atoms are reported. This new type of extended metal atom chain (EMAC) compound differs from earlier ones in that ligand exchange at the axial positions cannot occur, because the axial ligands are part of the entire ligand. Four such compounds, all crystallographically characterized, are reported. This work is a proof-of-concept project that will be extended to other metals with these and other homologous ligands. The Royal Society of Chemistry.
Synthesis of (NH)m(NMe)4-m-bridged calix[4]pyridines and the effect of NH bridge on structure and properties
Zhang, En-Xuan,Wang, De-Xian,Huang, Zhi-Tang,Wang, Mei-Xiang
supporting information; experimental part, p. 8595 - 8603 (2010/03/05)
(Chemical Equation Presented) The (NH)m(NMe)4-m- bridged calix[4]pyridines (m = 1-4) 19-23 were synthesized in excellent yields from deprotection of N-allyl groups of (NAllyl)m(NMe) 4-m-bridged calix[4]pyridine derivatives 8 and 15-18, which were prepared in moderate yields by macrocyclic 2+2 and 1+3 coupling reactions between simple diamino- and dibromo-substituted fragments. In the solid state, (NH)m(NMe)4-m-bridged calix[4]pyridines adopted different 1,3-alternate conformations due to mainly the formation of varied conjugation systems of bridging NH units with their neighboring pyridines. In solution, all (NH)m(NMe)4-m-bridged calix[4]pyridines were very fluxional and the rates of interconversion of various conformational structures were very rapid relative to the NMR time scale. While (NH)4-bridged calix[4]pyridine 23 formed the strongest conjugation system, (NH) 2(NMe)2-bridged calix[4]pyridine 21 acted as a selective fluorescence probe in the recognition of zinc(II) ion in solution with the dramatic enhancement of fluorescence intensity.