The unusually high proton affinity of Aza-18-crown-6 ether: Implications for the molecular recognition of lysine in peptides by lariat crown ethers
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study of cohesive devices in the textbook of english for the students of apsychology by rastegarpour
this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...
Molecular recognition and conductance in crown ethers.
Crown ethers have the remarkable property of recognizing and binding specific metal cations in complex mixtures. We propose to combine molecular recognition with molecular electric conductance. The question we address is: can the event of binding a cation be sensed by a change in conductance? Specifically, we study a short molecular wire (MW) containing a crown-6 molecule connected via sulfur a...
متن کاملMolecular recognition of arginine in small peptides by supramolecular complexation with dibenzo-30-crown-10 ether
The protonated, alkyl-guanidinium side chain of arginine forms a stable noncovalently bound complex with dibenzo-30crown-10 (DB30C10) in the gas phase. This gas phase adduct is detected through the use of electrospray ionization mass spectrometry (ESI-MS). The supramolecular complex is stabilized by extensive hydrogen bonding and ion–dipole interactions between the protonated guanidinium group ...
متن کاملLaser spectroscopic study on the conformations and the hydrated structures of benzo-18-crown-6-ether and dibenzo-18-crown-6-ether in supersonic jets.
The laser-induced fluorescence spectra of jet-cooled benzo-18-crown-6 (B18C6) and dibenzo-18-crown-6 (DB18C6) exhibit a number of vibronic bands in the 35 000-37 000 cm(-1) region. We attribute these bands to monomers and hydrated clusters by fluorescence-detected IR-UV and UV-UV double resonance spectroscopy. We found four and two conformers for bare B18C6 and DB18C6, and the hydration of one ...
متن کاملResponsive supramolecular gels constructed by crown ether based molecular recognition.
Responsive supramolecular gels were constructed from crown ether terminated four-arm star poly(epsilon-caprolactone) (PCL-DB24C8) and dibenzylammonium-terminated two-arm PCL-DBAS (see scheme), exploiting the formation of pseudorotaxane linkages between crown ether and ammonium moieties. The resultant supramolecular gels exhibit thermo- and pH-induced reversible gel-sol transition.
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ژورنال
عنوان ژورنال: Journal of the American Society for Mass Spectrometry
سال: 2002
ISSN: 1044-0305,1879-1123
DOI: 10.1016/s1044-0305(02)00368-9