113487-25-5Relevant articles and documents
Novel self-adaptive boat-shaped complexes with a tetraphosphine ligand
Yue, Kai,Guo, Yi-He,Pan, Jia-Qing,He, Kai,Qiao, Yuan-Yuan,Li, Qing-Shan,Xu, Feng-Bo
, p. 13689 - 13695 (2018)
A series of novel boat-shaped host-guest complexes were designed and synthesized by the combination of a new calixarene fragment-based tetraphosphine ligand L with group 11 metal salts Cu(MeCN)4ClO4 and AgNO3 in a self-assembly process, and by the following anion exchange reactions of complex 1 with sodium p-toluenesulfonate, AcONa, PhCO2Na and sodium 9-anthrylcarboxylate. The host with a novel boat-shaped cavity is capable of self-adaptive encapsulation of various anions of different sizes through M(i)-O coordinations and CH?π interactions between the host and guest anion. The DFT calculations confirmed that the CH?π interaction played a vital role in the self-adaptive phenomenon in complexes 4-6.
Effects of alkyl substitution on the physical properties and gas transport behavior in selected poly(R-phenoxyphosphazenes)
Ogden, Mark D.,Orme, Christopher J.,Stewart, Frederick F.
, p. 3879 - 3886 (2011)
A systematic preparation of alkyl substituted phenoxyphosphazene polymers was performed and their gas transport properties determined. In this study, phosphazenes substituted with 4-methylphenol, 4-ethylphenol, and 4-isopropylphenol are reported. An additional polymer substituted with 4-tert-butylphenoxy-1-ethanol also was synthesized in this work. Data derived for these materials, including chemical, thermal and gas transport characterization, were compared to previous reports discussing poly[bis-phenoxyphosphazene] and its analog with tert-butyl substitution: poly[bis-(4-tert-butylphenoxy)phosphazene]. The tert-butyl moiety influences orderly chain packing, presumably through steric hindrance that can influence aromatic π-stacking. For the new poly[(alkylphenoxy)phosphazenes], semicrystallinity is maintained and the added steric bulk serves to decrease the polymer glass transition temperature (Tg) and increase both permeability and selectivity for the gas pairs: O2/N2 and CO 2/CH4. Removal of the tert-butyl moiety from the immediate vicinity of the backbone through a flexible spacer serves to depress the Tg as compared to poly[bis-(4-tert-butylphenoxy)phosphazene], but provides no performance enhancement for gas transport.
Synthesis, structure, and extraction behavior of 4,5′,4″,5?-tetra-tert-butyltetrabenzo-24-crown-8
Levitskaia, Tatiana G.,Sachleben, Richard A.,Bryan, Jeffrey C.,Moyer, Bruce A.
, p. 808 - 814 (2007/10/03)
Isomerically pure 4,5′,4″,5?-tetra-tert-butyltetrabenzo-24-crown-8 was synthesized by a route that eliminates any need for isomer separation. Its structure was determined using single crystal X-ray diffraction methods. Since the observed saddle-shaped con
Proton-Ionizable Crown Compounds. 10. Preparation and Structural Studies of Macrocyclic Ligands Containing Two Sulfonamide Units and With Seventeen to Twenty-Six Ring Members
Bradshaw, Jerald S.,Koyama, Hiroyuki,Dalley, N. Kent,Izatt, Reed M.,Biernat, Jan F.,Bochenska, Maria
, p. 1077 - 1083 (2007/10/02)
Eight new macrocyclic ligands each containing two sulfonamide groups have been prepared.Six of these compounds have both the sulfur and nitrogen atoms of the sulfonamide units substituted with aromatic rings.The nitrogen atoms of the other two compounds have alkyl ring connections.X-ray crystal structure data were obtained for new macrocyclic compounds of 20 and 23 ring members.Each crystal structure showed two molecules in the asymmetric unit.Molecule A of 5 and both molecules of 7 exist in a compact conformation suggesting that they could wrap around a metal ion dur ing complexation.Some of these compounds will be used as cation carriers in a bulk liquid membrane system.
