Selective electrochemical recognition of the dihydrogen phosphate anion in the presence of hydrogen sulfate and chloride ions by new neutral ferrocene anion receptors
作者:Paul D. Beer、Zheng Chen、Alistair J. Goulden、Andrew Graydon、Sally E. Stokes、Trevor Wear
DOI:10.1039/c39930001834
日期:——
New neutral ferrocene anionreceptors L3, L4, L5 selectively complex, electrochemically recognise and respond to the dihydrogenphosphate guest anion in the presence of excess amounts of hydrogen sulfate and chloride anions.
Electrochemical response to anions in acetonitrile by neutral molecular receptors containing ferrocene, amide and amine moieties
作者:Zheng Chen、Andrew R. Graydon、Paul D. Beer
DOI:10.1039/ft9969200097
日期:——
Voltammetric and NMR investigations of anion binding by neutral ferrocene-based receptors have been performed in aprotic environments. NMR studies show that the amide functionalised ligands are capable of interaction with a variety of anions, including chloride, hydrogensulfate and dihydrogenphosphate anions. Stability constants were elucidated where possible. Electrochemical studies highlight a characteristic
Second harmonic generation in ferrocene based hydrogen bonded assemblies
作者:Sushanta K Pal、Anu Krishnan、Puspendu K Das、Ashoka G Samuelson
DOI:10.1016/s0022-328x(01)00960-3
日期:2001.12
Supramolecular assemblies formed by electron donors and acceptors might possess very large optical nonlinearity, even larger than the sum of the constituents if they form noncentrosymmetric networks. To probe this hypothesis we have functionalized barbituric acid, by condensing it with ferrocene carboxaldehyde to give 1, a hydrogen bond donor-acceptor-donor (H-DAD). This molecule complements the hydrogen bond donor acceptor sites of 2,6-diaminopyridine (2) which is a hydrogen bond acceptor-donor-acceptor (H-ADA). 2,6-Diaminopyridine was further functionalized with acetyl ferrocene to give 3, which forms complexes with 1. Complex formation was studied using nuclear magnetic resonance spectroscopy. The second order nonlinear optical (NLO) response of these hydrogen bonded assemblies has been probed by hyper Rayleigh scattering (HRS) measurements and was found to be maximum when I was mixed with five equivalents of 3. A plausible explanation for the formation of 1:5 complex was given on the basis of control experiments with 4, a methylated analog of 1, and the addition of a strong hydrogen bond acceptor solvent, methanol. (C) 2001 Elsevier Science B.V. All rights reserved.