Results 21 to 30 of about 171,006 (202)
O- vs. N-protonation of 1-dimethylaminonaphthalene-8-ketones: formation of a peri N–C bond or a hydrogen bond to the pi-electron density of a carbonyl group [PDF]
, 2014 X-ray crystallography and solid-state NMR measurements show that protonation of a series of 1-dimethylaminonaphthalene-8-ketones leads either to O protonation with formation of a long N–C bond (1.637–1.669 Å) between peri groups, or to N protonation and ...
Allen +39 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
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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
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
The rate of the proton-proton reaction
The Astrophysical Journal, 1994 We re-evaluate the matrix element for the proton-proton reaction which is important for stellar-evolution calculations and for the solar-neutrino problem. We self-consistently determine the effect of vacuum polarization on the matrix element by first correcting the low-energy scattering data to account for vacuum polarization.
Kamionkowski, Marc, Bahcall, John N.
openaire +2 more sources
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
Synthesis and characterisation of ruthenium complexes containing a pendent catechol ring [PDF]
, 2004 A series of [Ru(bipy)₂L]⁺ and [Ru(phen)₂L]⁺ complexes where L is 2-[5-(3,4-dimethoxyphenyl)-4H-1,2,4-triazol-3-yl]pyridine (HL1) and 4-(5-pyridin-2-yl-4H-1,2,4-triazol-3-yl)benzene-1,2-diol (HL2) are reported.
Adrian L. Guckian +58 more
core +1 more source
The Mode of Protonation of Amides [PDF]
, 1958 The relative basicities of oxygen versus nitrogen in amides is a problem which has not been satisfactorily resolved. However, it might be anticipated from considerations of resonance and structural parameters that in strongly acidic solutions the proton ...
Fraenkel, Gideon, Niemann, Carl
core +1 more source
Strangeness production in proton—proton and proton—nucleus collisions [PDF]
Pramana, 2006 16 pages, 9 figures, Talk presented in the workshop on Hadron Physics, Puri, India, March 7-17 ...
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Cancers, 2015 In addition to the physical advantages (Bragg peak), the use of charged particles in cancer therapy can be associated with distinct biological effects compared to X-rays. While heavy ions (densely ionizing radiation) are known to have an energy- and charge-dependent increased Relative Biological Effectiveness (RBE), protons should not be very ...
Tommasino F., Durante M.
openaire +4 more sources