Results 31 to 40 of about 2,189,236 (165)

Identification of the protonation and oxidation states of the oxygen-evolving complex in the low-dose X-ray crystal structure of photosystem II

open access: yesFrontiers in Plant Science, 2023
In photosystem II (PSII), the O3 and O4 sites of the Mn4CaO5 cluster form hydrogen bonds with D1-His337 and a water molecule (W539), respectively. The low-dose X-ray structure shows that these hydrogen bond distances differ between the two homogeneous ...
Keisuke Saito   +4 more
doaj   +1 more source

(E)-4-Hydroxy-N′-(2-hydroxy-4-methoxybenzylidene)benzohydrazide monohydrate

open access: yesActa Crystallographica Section E, 2009
The Schiff base molecule of the title compound, C15H14N2O4·H2O, adopts a trans configuration with respect to the C=N double bond; the Schiff base itself is almost planar (r.m.s. deviation for all non-H atoms = 0.040 Å).
Nooraziah Mohd Lair   +2 more
doaj   +1 more source

Supercritical Water is not Hydrogen Bonded [PDF]

open access: yesAngewandte Chemie, 2020
AbstractThinking about water is inextricably linked to hydrogen bonds, which are highly directional in character and determine the unique structure of water, in particular its tetrahedral H‐bond network. Here, we assess if this common connotation also holds for supercritical water.
Philipp Schienbein, Dominik Marx
openaire   +5 more sources

Quantifying the ability of the CF2H group as a hydrogen bond donor

open access: yesBeilstein Journal of Organic Chemistry
The CF2H group can act as a hydrogen bond donor, serving as a potential surrogate for OH or SH groups but with a weaker hydrogen bond donation ability.
Matthew E. Paolella   +4 more
doaj   +1 more source

2-[(4-Methylbenzoyl)hydrazono]propionic acid monohydrate

open access: yesActa Crystallographica Section E, 2009
In the title compound, C11H12N2O3·H2O, the water molecule is a hydrogen-bond donor to the double-bond amide and the carbonyl O atoms of two acid molecules; it is also a hydrogen-bond acceptor to the acid –OH and amide –NH– groups ...
Seik Weng Ng, Kong Mun Lo, Hon Wee Wong
doaj   +1 more source

Triol-promoted activation of C–F bonds: Amination of benzylic fluorides under highly concentrated conditions mediated by 1,1,1-tris(hydroxymethyl)propane

open access: yesBeilstein Journal of Organic Chemistry, 2013
Activation of the C–F bond of benzylic fluorides was achieved using 1,1,1-tris(hydroxymethyl)propane (2) as a hydrogen bond-donating agent. Investigations demonstrated that hydrogen bond-donating solvents are promoting the activation and hydrogen bond ...
Pier Alexandre Champagne   +3 more
doaj   +1 more source

Methyl 2-amino-4,5-dimethoxybenzoate

open access: yesActa Crystallographica Section E, 2013
The title compound, C10H13NO4, is essentially planar, with an r.m.s. deviation of 0.049 Å. An intramolecular C—H...O hydrogen bond occurs and the amino group forms an intramolecular N—H...Oester hydrogen bond; the other H atom ...
Naadiya Patel, Tania N. Hill
doaj   +1 more source

Hydrogen Bonds in Polymer Folding [PDF]

open access: yesPhysical Review Letters, 2001
Physical Review ...
1.2. J. Borg   +3 more
openaire   +5 more sources

The Characteristics of PD-L1 Inhibitors, from Peptides to Small Molecules

open access: yesMolecules, 2019
The programmed cell death ligand protein 1 (PD-L1) is a member of the B7 protein family and consists of 290 amino acid residues. The blockade of the PD-1/PD-L1 immune checkpoint pathway is effective in tumor treatment.
Yanwen Zhong   +3 more
doaj   +1 more source

How Strong Is the Hydrogen Bond in Hybrid Perovskites?

open access: yesJournal of Physical Chemistry Letters, 2017
Hybrid organic–inorganic perovskites represent a special class of metal–organic framework where a molecular cation is encased in an anionic cage. The molecule–cage interaction influences phase stability, phase transformations, and the molecular dynamics.
K. Svane   +6 more
semanticscholar   +1 more source

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