Two new Sm( iii ) Schiff base complexes have been synthesized and fully characterized from the novel ligands: L1 , benzoic acid pyridin-2-ylmethylene-hydrazide L2 2-[(4-methoxy-phenylimino)-methyl]-phenol.

We report the first vibrationally resolved spectroscopic study of FeO+. observe 0←0 and 1←0 bands a Σ6←XΣ6 transition at 28 648.7 29 311 cm−1. Under slightly modified source conditions 1←1 is observed 473 In addition to establishing an upper limit D0o(Fe+–O)⩽342.7 kJ/mol, our results give experimental measurements vibrational frequencies in both ground state, ν0″=838±4 cm−1, excited electronic ν0′=662±2 Partially rotational structure underlying peaks has been analyzed measure predissociation...

Tautomerism in the ground and excited states of 7-hydroxyquinoline (7HQ) was studied different solvents using steady-state lifetime spectroscopic measurements, density functional theory (DFT) calculations, molecular dynamics (MD) simulations. Equilibrium between enol keto/zwitterion tautomers exists 7HQ, which is solvent-dependent. Of used this study, only water does absorbance spectrum 7HQ show absorption from both zwitterion tautomers. In addition, aqueous media, fluorescence observed...

A series of trimethylsilyl-protected monoalkynes (Me3SiC≡C–R) and bis-alkynes (Me3 SiC≡C–R–C≡CSiMe3) incorporating carbazole spacer groups (R = carbazole-2-yl, carbazole-3-yl, carbazole-2,7-diyl, N-(2-ethylhexyl)carbazole-2,7-diyl, carbazole-3,6-diyl, N-(2-ethylhexyl)carbazole-3,6-diyl), together with the corresponding terminal (H–C≡C–R) (H–C≡C–R–C≡C–H), have been synthesized characterized. The CuI-catalyzed dehydrohalogenation reaction between trans-[(Ph)(Et3P)2PtCl], trans-[(Et3P)2PtCl2],...

Hydrated divalent nickel clusters, Ni2+(H2O)n (n = 4−7), have been generated through electrospray ionization and studied with laser photofragment spectroscopy. Clusters containing six seven water molecules dissociate by loss of either one or two molecules. In contrast, Ni2+(H2O)4 dissociates via charge reduction, producing H3O+ + NiOH+(H2O)2. The modest kinetic energy release in the product is agreement a salt-bridge dissociation mechanism. Observed cross-sections indicate that hexahydrated...

Specific ion–molecule reactions are used to prepare two intermediates of the FeO++CH4 reaction, and photodissociation jet-cooled is examined in visible near-ultraviolet using time-of-flight mass spectrometry. The spectrum aquo iron carbene complex [H2C=Fe–OH2]+ shows transitions at least four excited electronic states FeCH2+ chromophore, with broad vibrational structure. Photoexcitation insertion intermediate [HO–Fe–CH3]+ leads formation FeOH++CH3 also triggers reaction produce Fe++CH3OH....

Trimethylsilyl-protected dialkynes incorporating azobenzene linker groups, Me3SiC≡CRC≡CSiMe3 (R = azobenzene-3,3′-diyl, azobenzene-4,4′-diyl, 2,5-dioctylazobenzene-4,4′-diyl), and the corresponding terminal dialkynes, HC≡CRC≡CH, have been synthesized characterized. The CuI-catalyzed dehydrohalogenation reaction between trans-[Ph(Et3P)2PtCl] deprotected in a 2:1 ratio iPr2NH/CH2Cl2 gives platinum(II) diynes trans-[Ph(Et3P)2PtC≡CRC≡CPt(PEt3)2Ph], while polycondensation trans-[(nBu3P)2PtCl2]...

Squaramide–quaternary ammonium salt is illustrated as a simple, tunable, and competent metal‐free binary catalytic platform for the atom‐economic conversion of epoxides isocyanates into oxazolidinones. Although, various metal catalysts have been employed title reaction, application organocatalysis scarce. At first, rational survey activity several air‐stable architecturally distinct squaramides was undertaken. Thereafter, impact on capability different parameters, such temperature, catalyst...

The distinctive characteristics of near-infrared fluorescent organic molecules render them indispensable across diverse applications, from energy harvesting to bioimaging and sensing technologies. In this work, we continue our investigation on the chalcone derivative, 4-dimethylamino-2'-hydroxychalcone (

The resonance enhanced (1+1) photodissociation spectra of the (8,0) and (9,0) bands Π7/26←Σ+6 system FeO+ have been recorded. From a rotational analysis, parameters for Σ+6 ground state obtained first time. constant B0=0.5020±0.0004 cm−1 is derived, giving r0=1.643±0.001 Å. Other molecular determined are spin–spin coupling constant, λ=−0.126±0.006 cm−1, spin–rotational γ=−0.033±0.002 cm−1. assignment upper as Π7/26 based on characteristic appearance band time-dependent density functional...

The spectroscopy of anthranilic acid (AA) was examined in neat and binary solvents varying polarity hydrogen bonding strength order to understand the role water solvating polar sites molecule. With exception water, Stokes shift AA different found be linearly correlated with normalized molar transition energy solvent (ETN), indicating major effect solution. Analysis absorption fluorescence spectra reveals that exists as an anion neutral water. pKa (4.50) pKa* (4.44) values were estimated from...

Light-responsive materials capable of undergoing photoinduced molecular transformation are excellent candidates for energy storage. Herein, we report a promising new liquid crystalline terpolymer that is trapping the absorbed photon upon exposure to UV light through trans → cis isomerization and aggregation. MeOAzB-T (contains p-methoxyazobenzene, 2-acrylamido-2-methyl-1-propanesulfonic acid, methyl(methacrylate) monomeric units) shows ← normal thermal recovery in solution (THF) after...

R. H. Cragg, J. P. N. Husband and A. F. Weston, Chem. Soc. D, 1970, 1701a DOI: 10.1039/C2970001701A

Photofragment spectra of jet-cooled MCH2+ (M = Fe, Co, Ni) have been measured. Our investigation NiCH2+ represents the first reported spectroscopic study this molecule. A threshold is observed for each three systems. In addition to imposing strict upper limits on M+−CH2 bond strengths, these results further discussion concerning interpretation thresholds as thermodynamic limits. The measured are: D°0(Fe+−CH2) ≤ 342 ± 2 kJ/mol, D°0(Co+−CH2) 331 and D°0(Ni+−CH2) 295 5 kJ/mol. Three distinct,...

Photodissociation of thermalized NiOH+ and NiOH+(H2O) are examined over the visible near-ultraviolet using time-of-flight mass spectrometry. Branching ratios photodissociation cross sections monitored as a function laser wavelength. Loss OH is only dissociation channel observed in NiOH+, whereas loss H2O present, competitive, NiOH+(H2O). The photofragment spectrum shows absorption bands at ∼300 ∼400 nm. An almost identical for net Spectroscopic thresholds taken from spectra have been...

We have recently used 6-, 7-, and 8-hydroxyquinolines (HQs) as fluorescent probes to study the binding mechanism in one of drug sites human serum albumin. In present work we absorption spectra HQ molecules neat binary mixtures dioxane water order identify different tautomeric species ground state. This should help identifying environment nanocavities macromolecules when HQs are local reporters. The enol form is shown be only tautomer for three water, with exception 7HQ which both zwitterion...