Selective Amine Recognition Driven by Host–Guest Proton Transfer and Salt Bridge Formation
作者:Calogero Capici、Giuseppe Gattuso、Anna Notti、Melchiorre F. Parisi、Sebastiano Pappalardo、Giovanna Brancatelli、Silvano Geremia
DOI:10.1021/jo301730m
日期:2012.11.2
pattern between the carboxyl group and the phenolic oxygen atom(s). The affinity of amines for calix[5]arene derivatives 1a·H and 1b·H was probed by 1H NMR spectroscopy and single-crystal X-ray diffraction studies. These carboxylcalix[5]arenes are shown to selectively recognize linear primary amines—over branched, secondary, and tertiary amines—by a two-step process involving a proton transfer from the
Synthesis, X-ray structures and reactivity of calix[5]arene bismuth(iii) and antimony(iii) complexes
作者:Daniel Mendoza-Espinosa、Tracy A. Hanna
DOI:10.1039/b903943k
日期:——
A series of calix[5]arene bismuth(III) and antimony(III) mono- and bimetallic complexes were synthesized and fully characterized by NMR, X-ray, IR, mp, UV-Vis and elemental analysis. Reaction of p-tert-butylcalix[5]arene (tBuC5(H)5) trianionic salts M'3.tBuC5(H)2 (M'=Li, Na, K) with MCl3 (M=Bi, Sb) yielded monometallic complexes [BitBuC5(H)2}] 1 and [SbtBuC5(H)2}] 2, respectively. 1H NMR spectra
Synthesis and characterization of a Bi<sub>10</sub>O<sub>8</sub>(OAr)<sub>16</sub> oxo-cluster supported by p-tert-butylcalix[5]arene ligands
作者:Daniel Mendoza-Espinosa
DOI:10.1039/c6dt02068b
日期:——
Wet [tBuC5(Bn)(H)4] ligand reacts with excess of Bi[N(SiMe3)2]3 to yield the dimeric complex 1 [BitBuC5(Bn)(H)}]2 and cluster 2 [Bi10O8tBuC5(Bn)(H)}4]. Complex 2 features multicoordinated bismuth(iii) centers in an overall Bi10O8(OAr)16 core which represents the largest bismuth oxo-cluster supported by calix[n]arene ligands to date.