Results 21 to 30 of about 168,635 (283)
Carbon-13 n.m.r. investigation on the nitrogen methylation of the mono- and diazanaphthalenes [PDF]
, 1977 The 13C n.m.r. spectra of the N-methylated mono- and diazanaphthalenes have been recorded and analysed. It has been shown that N-methylation as well as N-protonation in cinnoline occur predominantly at the -nitrogen atom.
Ham, Dirk M.W. van den +2 more
core +2 more sources
Proton Availability at the Air/Water Interface [PDF]
, 2010 The acidity of the water surface sensed by a colliding gas is determined in experiments in which the protonation of gaseous trimethylamine (TMA) on aqueous microjets is monitored by online electrospray mass spectrometry as a function of the pH of the ...
Colussi, A. J. +2 more
core +2 more sources
Electrochemistry of potential bioreductive alkylating quinones : Part 2. Electrochemical properties of 2,5-bis(1-aziridinyl)-3,6-bis(ethoxycarbonylamino)-1,4-benzoquinone and some model compounds [PDF]
, 1990 The reduction mechanism of 2,5-bis(1-aziridinyl)-3,6-bis(ethoxycarbonylamino)-1,4-benzoquinone (Diaziquone, AZQ) and several model compounds of the mono- and bis(1-aziridinyl)quinone type at the dropping mercury electrode in aqueous solutions was studied.
Blauw, J.S. +6 more
core +2 more sources
Acta Crystallographica Section E: Crystallographic Communications, 2017 The title compound, (C15H14N3)[NiCl4]Cl, comprises an NiII cation tetrahedrally coordinated by four chloride anions, a non-coordinating chloride anion and an essentially planar terpyridinium trication (tpyH33+), in which the central pyridinium ring forms
Ouahida Zeghouan +3 more
doaj +1 more source
Journal of Natural Fibers, 2023 Chitin is one of the most abundant biopolymers in nature. Herein, we report the successful preparation of chitin nanofibers (ChNFs) from shrimp shell waste using a partial deacetylation process with NaOH and high-speed blending.
Anyaporn Boonmahitthisud +2 more
doaj +1 more source
Enantioselective protonation [PDF]
Nature Chemistry, 2009 Enantioselective protonation is a common process in biosynthetic sequences. The decarboxylase and esterase enzymes that effect this valuable transformation are able to control both the steric environment around the proton acceptor (typically an enolate) and the proton donor (typically a thiol).
Mohr, Justin T. +2 more
openaire +3 more sources
Ocean acidification affects marine chemical communication by changing structure and function of peptide signalling molecules [PDF]
, 2016 Ocean acidification is a global challenge that faces marine organisms in the near future with a predicted rapid drop in pH of up to 0.4 units by the end of this century.
Adamo +69 more
core +1 more source
Protonated and Cationic Helium Clusters
Molecules, 2020 Protonated rare gas clusters have previously been shown to display markably different structures compared to their pure, cationic counterparts. Here, we have performed high-resolution mass spectrometry measurements of protonated and pristine clusters of ...
Linnea Lundberg +4 more
doaj +1 more source
Direct protonation of the W–H bonds of Bis(pentamethylcyclopentadienyl)tungsten dihydride [PDF]
, 1989 Protonation of (C_5Me_5)_2 WH_2 to give [(C_5Me_5)_2WH_3]+ is proposed to occur by attack at both W–H bonds rather than by direct attack at the d^2 metal ...
Bercaw, John E., Parkin, Gerard
core +1 more source
A gated strategy stabilizes room‐temperature phosphorescence
Aggregate, 2023 Room‐temperature phosphorescence (RTP) of purely organic materials is easily quenched with unexpected purposes because the excited triplet state is extremely susceptible to external stimuli.
Kaizhi Gu +7 more
doaj +1 more source