Zinc(II) bis(dipyrromethenate)s crystal solvates with dimethyl sulfoxide Composition, stability and spectral-luminescent properties

© 2017 Elsevier B.V.It was found that 3,3′-, 2,3′ and 2,2′-zinc(II) bis(dipyrromethenate)s ([Zn2L2]) form stable supramolecular complexes of the composition [Zn2L2(DMSO)n] (n = 1 or 2) with dimethyl sulfoxide (DMSO). The [Zn2L2(DMSO)n] are stable in the solid phase and solutions. Composition, stability, and spectral-luminescent properties of the [Zn2L2(DMSO)n] crystal solvates were studied by means of FTIR, PXRD, 1H NMR, DOSY, absorption and fluorescence analyses. Spectroscopic studies showed that the quantum yields (φ) of [Zn2L2(DMSO)n] are lower (to ∼1.6–3.6 times) than quantum yields (φо) of [Zn2L2] in cyclohexane. Quantum-chemical study allowed to suggest the most likely mechanism of the DMSO molecules coordination on the coordinating centers of [Zn2L2]. It is demonstrated, that the high-energy coordination interactions (Zn − O) in [Zn2L2(DMSO)n] are the main cause of the fluorescence quenching of [Zn2L2] in the presence of DMSO. Fluorescence quenching of [Zn2L2] in the DMSO presence is based on the photoinduced electron transfer (PeT) mechanism. The obtained results are interesting for the development of new [Zn2L2] fluorescent sensors of the DMSO molecules

Novel non-covalent supramolecular systems based on zinc(II) bis(dipyrromethenate)s with fullerenes

© 2018 Elsevier B.V. This paper presents the results of UV/vis, fluorescence, FT-IR, DOSY, and DFT study of a novel non-covalent supramolecular systems based on zinc(II) bis(dipyrromethenate)s ([Zn2L2]) with C60. It was found that zinc(II) bis(dipyrromethenate) forms stable supramolecular π-π-complexes ([Zn2L2(C60)4]) with C60. DFT calculations revealed stable complexation between [Zn2L2] and C60. The [Zn2L2(C60)4] LUMO energy levels are predominantly spread on the C60 unit and the HOMO energy levels are mainly spread on the [Zn2L2]. The photoinduced electron transfer testing by the substantial fluorescence quenching of the [Zn2L2] by non-covalent bonded C60 gives the positive result that shows prospects of the studying [Zn2L2(C60)4] as the active layers in solar energy conversion devices

Structural and textural properties of pillared montmorillonite at intercalation of large Al- and Al/Ce-polyhydroxocomplexes

© 2015, Pleiades Publishing, Ltd. The possibility of adjusting the separation of silicate layers in montmorillonite in a broad range of basal distances d001 (1.3–2.4 nm) at the intercalation of large (0.7–1.8 nm) polyhydroxocomplexes of aluminum ([Al13O4(OH)24(H2O)12]7+, [Al30O8(OH)56(H2O)24]18+) and aluminum/cerium synthesized through the combined hydrolysis of aluminum and cerium salts in a reactor under pressure is shown. The formation of polyhydroxocomplexes was controlled by the methods of 27Al NMR and photon correlation and fluorescent spectroscopy at different concentrations of Al3+ ions (2.5–5.1 M) in solution. Textural properties (specific surface area, total pore volume, and mesoporosity) and fractal dimensionality of the samples of intercalated montmorillonite obtained by annealing at 300°C have been determined using the method of low-temperature nitrogen adsorption–desorption

Novel BODIPY-conjugated amino acids: Synthesis and spectral properties

© 2019 Elsevier B.V. Three BODIPY-based conjugates with lysine, methionine, and tryptophan bound via amino group were synthesized and characterized. Spectral properties of the compounds were studied and a number of photophysical characteristics were obtained. Bioconjugates investigated are water soluble, which makes them promising markers for various bioobjects

Novel BODIPY-conjugated amino acids: Synthesis and spectral properties

© 2019 Elsevier B.V. Three BODIPY-based conjugates with lysine, methionine, and tryptophan bound via amino group were synthesized and characterized. Spectral properties of the compounds were studied and a number of photophysical characteristics were obtained. Bioconjugates investigated are water soluble, which makes them promising markers for various bioobjects

Zinc(II) bis(dipyrromethenate)s crystal solvates with dimethyl sulfoxide Composition, stability and spectral-luminescent properties

© 2017 Elsevier B.V.It was found that 3,3′-, 2,3′ and 2,2′-zinc(II) bis(dipyrromethenate)s ([Zn2L2]) form stable supramolecular complexes of the composition [Zn2L2(DMSO)n] (n = 1 or 2) with dimethyl sulfoxide (DMSO). The [Zn2L2(DMSO)n] are stable in the solid phase and solutions. Composition, stability, and spectral-luminescent properties of the [Zn2L2(DMSO)n] crystal solvates were studied by means of FTIR, PXRD, 1H NMR, DOSY, absorption and fluorescence analyses. Spectroscopic studies showed that the quantum yields (φ) of [Zn2L2(DMSO)n] are lower (to ∼1.6–3.6 times) than quantum yields (φо) of [Zn2L2] in cyclohexane. Quantum-chemical study allowed to suggest the most likely mechanism of the DMSO molecules coordination on the coordinating centers of [Zn2L2]. It is demonstrated, that the high-energy coordination interactions (Zn − O) in [Zn2L2(DMSO)n] are the main cause of the fluorescence quenching of [Zn2L2] in the presence of DMSO. Fluorescence quenching of [Zn2L2] in the DMSO presence is based on the photoinduced electron transfer (PeT) mechanism. The obtained results are interesting for the development of new [Zn2L2] fluorescent sensors of the DMSO molecules

Zinc(II) bis(dipyrromethenate)s crystal solvates with dimethyl sulfoxide Composition, stability and spectral-luminescent properties

© 2017 Elsevier B.V.It was found that 3,3′-, 2,3′ and 2,2′-zinc(II) bis(dipyrromethenate)s ([Zn2L2]) form stable supramolecular complexes of the composition [Zn2L2(DMSO)n] (n = 1 or 2) with dimethyl sulfoxide (DMSO). The [Zn2L2(DMSO)n] are stable in the solid phase and solutions. Composition, stability, and spectral-luminescent properties of the [Zn2L2(DMSO)n] crystal solvates were studied by means of FTIR, PXRD, 1H NMR, DOSY, absorption and fluorescence analyses. Spectroscopic studies showed that the quantum yields (φ) of [Zn2L2(DMSO)n] are lower (to ∼1.6–3.6 times) than quantum yields (φо) of [Zn2L2] in cyclohexane. Quantum-chemical study allowed to suggest the most likely mechanism of the DMSO molecules coordination on the coordinating centers of [Zn2L2]. It is demonstrated, that the high-energy coordination interactions (Zn − O) in [Zn2L2(DMSO)n] are the main cause of the fluorescence quenching of [Zn2L2] in the presence of DMSO. Fluorescence quenching of [Zn2L2] in the DMSO presence is based on the photoinduced electron transfer (PeT) mechanism. The obtained results are interesting for the development of new [Zn2L2] fluorescent sensors of the DMSO molecules

Zinc(II) bis(dipyrromethenate)s crystal solvates with dimethyl sulfoxide Composition, stability and spectral-luminescent properties

© 2017 Elsevier B.V.It was found that 3,3′-, 2,3′ and 2,2′-zinc(II) bis(dipyrromethenate)s ([Zn2L2]) form stable supramolecular complexes of the composition [Zn2L2(DMSO)n] (n = 1 or 2) with dimethyl sulfoxide (DMSO). The [Zn2L2(DMSO)n] are stable in the solid phase and solutions. Composition, stability, and spectral-luminescent properties of the [Zn2L2(DMSO)n] crystal solvates were studied by means of FTIR, PXRD, 1H NMR, DOSY, absorption and fluorescence analyses. Spectroscopic studies showed that the quantum yields (φ) of [Zn2L2(DMSO)n] are lower (to ∼1.6–3.6 times) than quantum yields (φо) of [Zn2L2] in cyclohexane. Quantum-chemical study allowed to suggest the most likely mechanism of the DMSO molecules coordination on the coordinating centers of [Zn2L2]. It is demonstrated, that the high-energy coordination interactions (Zn − O) in [Zn2L2(DMSO)n] are the main cause of the fluorescence quenching of [Zn2L2] in the presence of DMSO. Fluorescence quenching of [Zn2L2] in the DMSO presence is based on the photoinduced electron transfer (PeT) mechanism. The obtained results are interesting for the development of new [Zn2L2] fluorescent sensors of the DMSO molecules

Novel non-covalent supramolecular systems based on zinc(II) bis(dipyrromethenate)s with fullerenes

© 2018 Elsevier B.V. This paper presents the results of UV/vis, fluorescence, FT-IR, DOSY, and DFT study of a novel non-covalent supramolecular systems based on zinc(II) bis(dipyrromethenate)s ([Zn2L2]) with C60. It was found that zinc(II) bis(dipyrromethenate) forms stable supramolecular π-π-complexes ([Zn2L2(C60)4]) with C60. DFT calculations revealed stable complexation between [Zn2L2] and C60. The [Zn2L2(C60)4] LUMO energy levels are predominantly spread on the C60 unit and the HOMO energy levels are mainly spread on the [Zn2L2]. The photoinduced electron transfer testing by the substantial fluorescence quenching of the [Zn2L2] by non-covalent bonded C60 gives the positive result that shows prospects of the studying [Zn2L2(C60)4] as the active layers in solar energy conversion devices

High-pressure NMR spectroscopy in studies of the conformational composition of small molecules in supercritical carbon dioxide

© 2020 Elsevier B.V. An experimental approach in conducting NMR measurements at supercritical parameters of state is discussed. A novel design of the high-pressure NMR cell was developed which allowed eliminating the field inhomogeneity and, thus, increasing the sensitivity of the experiment at the supercritical state. Analysis of the MD simulations and NMR data showed that two conformers of ibuprofen dominate in the solution in supercritical CO2 along the critical isochore 1.3 ρcr(CO2). Conformer populations calculated from MD simulations and from NMR spectra agree with each other