Tables of bond lengths determined by X-ray and neutron diffraction. Part 1. Bond lengths in organic compounds

Allen, Frank H.; Kennard, Olga; Watson, David; Brammer, Lee; Orpen, A. Guy; Taylor, Robin

doi:10.1039/p298700000s1

Cited by 10,979 publications

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“…21 As it had been demonstrated for VI 19 this indicates the delocalisation of the positive charge of 2 + into the imidazoline moiety which is illustrated by the structural formula A2 (Scheme 3).…”

mentioning

confidence: 74%

Isolation of a germanium(ii) cation and a germylene iron carbonyl complex utilizing an imidazolin-2-iminato ligand

Ochiai

Franz

et al. 2015

Dalton Trans.

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mentioning

confidence: 74%

Isolation of a germanium(ii) cation and a germylene iron carbonyl complex utilizing an imidazolin-2-iminato ligand

Ochiai

Franz

et al. 2015

Dalton Trans.

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“…Bond distances C7-C8 and C10a-C10 are shorter than other C-C bond lengths in the phenyl ring, indicating a quinoid character of this cycle 23 which increased in the anion form (Fig. 6).…”

Section: Monardine Electronic Transitions and Photophysicsmentioning

confidence: 95%

Synthesis and photophysics of novel biocompatible fluorescent oxocines and azocines in aqueous solution

Acuña

Álvarez-Pérez

Liras

et al. 2013

Phys. Chem. Chem. Phys.

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The spectroscopic properties in water solution of the different prototropic forms of the strongly fluorescent hemiacetal 4,9-dihydroxy-1,2-dihydro-4,11a-methanooxocino [4,5-b]benzofuran-5(4H)-one (1a, monardine), the aza analogue 4,9-dihydroxy-3,4-dihydro-1H-4,11a-methanobenzofuro[2,3-d]azocin-5(2H)-one (2a, azamonardine) and the respective 2-carboxyl derivatives (1b, 2b) have been studied by experimental and quantum-chemical methods. Monardine and carboxymonardine are the major products of new fluorogenic, room-temperature reactions of hydroxytyrosol or salvianic acid in aqueous solution, respectively, and present unique photophysical properties. Near neutral pH (pK a = 7.2) monardine switches from a weakly emitting, UV-absorbing (382 nm) neutral species to a VIS-absorbing (426 nm), blue emitting (464 nm) anion form, with a fluorescence quantum yield f F = 1 and single-exponential decay t F = 2.74 ns. This binary-like spectroscopic change from the neutral to the anionic form was interpreted based on time-dependent density functional theory (TDDFT) calculations as due to (i) the reversal of (n,p*) and (p,p*) lowest-lying singlet excited states, and (ii) a change in the triplet-state distribution accompanying monardine ionization which may abolish de-excitation via intersystem crossing.A similar fluorogenic reaction takes place with catecholamines such as dopamine and DOPA, to yield fluorescent azocines 2a and 2b which, depending on pH, may be present as cationic, neutral or anionic species. TDDFT computations of these forms were also carried out to assign the corresponding excitation transitions and emission properties. Besides the analytical interest of the fluorogenic reactions, the photochemical stability and biocompatibility of the bright-dark pH-controlled molecular switches 1a and 1b may facilitate novel labels and probes to be developed for superresolution fluorescence microscopy.

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“…This is due to a break in symmetry by the disorder of the central phenyl rings. The bond lengths and angles are all within normal ranges (Allen et al, 1987). The molecules of 3a adopted two different conformations in this structure, with the angle between the thiazolidinone and the phenyl ring either 60° or -50° (Figure 1a).…”

Section: Chemistrymentioning

confidence: 74%

Synthesis and antibacterial activity of novel 2-(arylimino)thiazolidin-4-one and 2-(benzylidenehydrazono)-3-arylthiazolidin-4-one derivatives

El‐Hossary¹,

Nissan²,

Edkins³

et al. 2016

J App Pharm Sci

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The ongoing spread of multidrug-resistant bacteria demands an intensive search for new antibacterial agents. In the present study, a series of new 1,3-thiazolidin-4-ones has been synthesized and investigated for its in vitro antibacterial activity. The most potent antibacterial compound 4c was found to be active, at low micromolar range, against Staphylococcus aureus, Staphylococcus epidermidis, Enterococcus faecalis and the pneumonic plague causative agent Yersinia pestis with minimum inhibitory concentrations of 5 µM, 2.5 µM, 2.5 µM and 5 µM, respectively. Compound 4c showed the ability to kill E. faecalis JH212 strain with a minimum bactericidal concentration of 5 µM. Furthermore, compounds 9b and 10a inhibited the biofilm formation in S. epidermidis, where they showed 70% to 80% inhibition at a concentration of 40 µM.

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Tables of bond lengths determined by X-ray and neutron diffraction. Part 1. Bond lengths in organic compounds

Cited by 10,979 publications

References 2 publications

Isolation of a germanium(ii) cation and a germylene iron carbonyl complex utilizing an imidazolin-2-iminato ligand

Isolation of a germanium(ii) cation and a germylene iron carbonyl complex utilizing an imidazolin-2-iminato ligand

Synthesis and photophysics of novel biocompatible fluorescent oxocines and azocines in aqueous solution

Synthesis and antibacterial activity of novel 2-(arylimino)thiazolidin-4-one and 2-(benzylidenehydrazono)-3-arylthiazolidin-4-one derivatives

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