26 research outputs found

    A Study of the Ligand Composition Change of the Eu3+ Chelate by Two-Stage Laser Excitation Luminescence and Computer Simulation of Kinetics

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    The europium(III)- tris(dibenzoylmethane)- triphenylphosphine oxide complex was studied in the polycrystalline state and in toluene at 298 K using the luminescence excitation method with two-stage rectangular pulses with decreasing intensity of stages. КомплСкс Π΅Π²Ρ€ΠΎΠΏΠΈΠΉ (III) - Ρ‚Ρ€ΠΈ (Π΄ΠΈΠ±Π΅Π½Π·ΠΎΠΈΠ»ΠΌΠ΅Ρ‚Π°Π½)-трифСнилфосфиноксид исслСдован Π² поликристалличСском состоянии ΠΈ Ρ‚ΠΎΠ»ΡƒΠΎΠ»Π΅ ΠΏΡ€ΠΈ 298 K с использованиСм ΠΌΠ΅Ρ‚ΠΎΠ΄Π° возбуТдСния Π»ΡŽΠΌΠΈΠ½Π΅ΡΡ†Π΅Π½Ρ†ΠΈΠΈ двухступСнчатыми ΠΏΡ€ΡΠΌΠΎΡƒΠ³ΠΎΠ»ΡŒΠ½Ρ‹ΠΌΠΈ ΠΈΠΌΠΏΡƒΠ»ΡŒΡΠ°ΠΌΠΈ со спадом интСнсивности ступСнСй

    Determination of Rate Constants and the Mechanism of Phototransformations of Metalloporphyrins by Solving the Inverse Photokinetic Problem

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    ΠœΠ΅Ρ‚ΠΎΠ΄Π°ΠΌΠΈ ΠΎΠ±Ρ€Π°Ρ‚Π½ΠΎΠΉ кинСтичСской Π·Π°Π΄Π°Ρ‡ΠΈ исслСдованы ΠΊΠΈΠ½Π΅Ρ‚ΠΈΠΊΠΈ флуорСсцСнции Π½Π΅ΠΊΠΎΡ‚ΠΎΡ€Ρ‹Ρ… Π·Π°ΠΌΠ΅Ρ‰Π΅Π½Π½Ρ‹Ρ… Zn- ΠΈ Mg-ΠΏΠΎΡ€Ρ„ΠΈΡ€ΠΈΠ½ΠΎΠ² Π² Ρ‚Π²Π΅Ρ€Π΄Ρ‹Ρ… ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€Π½Ρ‹Ρ… ΠΏΠ»Π΅Π½ΠΊΠ°Ρ… ΠΏΡ€ΠΈ Π²ΠΎΠ·Π±ΡƒΠΆΠ΄Π΅Π½ΠΈΠΈ двухступСнчатыми ΠΏΡ€ΡΠΌΠΎΡƒΠ³ΠΎΠ»ΡŒΠ½Ρ‹ΠΌΠΈ Π»Π°Π·Π΅Ρ€Π½Ρ‹ΠΌΠΈ ΠΈΠΌΠΏΡƒΠ»ΡŒΡΠ°ΠΌΠΈ ΠΈ 293K. Fluorescence kinetics of some substituted Zn- and Mg-porphyrins in solid polymeric films upon excitation by two-step-wise rectangular laser pulses and at 293 K are studied by methods of the inverse kinetic problem

    ЀотодСструкция Ρ†ΠΈΠ½ΠΊΠΎΠ²Ρ‹Ρ… комплСксов Ρ‚Π΅Ρ‚Ρ€Π°Π±Π΅Π½Π·ΠΎΠΏΠΎΡ€Ρ„ΠΈΡ€ΠΈΠ½ΠΎΠ² Π² ΠΏΠΎΠ»ΠΈΠΌΠ΅Ρ€Π½ΠΎΠΉ ΠΌΠ°Ρ‚Ρ€ΠΈΡ†Π΅ ΠΈ ΡΠ²Π΅Ρ‚ΠΎΡ‡ΡƒΠ²ΡΡ‚Π²ΠΈΡ‚Π΅Π»ΡŒΠ½Ρ‹Ρ… ΠΌΠ°Ρ‚Π΅Ρ€ΠΈΠ°Π»Π°Ρ… Π½Π° ΠΈΡ… основС

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    At room temperature, a high-efficiency photochromogenic reaction of destruction of Zn-tetra (4-tert butylbenzoic) porphyrin molecules in a polyvinyl butyral matrix has been revealed. The linear dependence of the photobleaching rate of porphyrin on the irradiation power density is indicative of a single-photon character of the reaction. The influence of pyridine and ethyl iodide additives as well as of intermolecular oxygen on the photodissociation rate of pigment molecules has been investigated. ΠŸΡ€ΠΈ ΠΊΠΎΠΌΠ½Π°Ρ‚Π½ΠΎΠΉ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π΅ происходит высокоэффСктивная фотохромогСнная рСакция Ρ€Π°Π·Ρ€ΡƒΡˆΠ΅Π½ΠΈΡ Zn-Ρ‚Π΅Ρ‚Ρ€Π° (4-Ρ‚Ρ€Π΅Ρ‚-Π±ΡƒΡ‚ΠΈΠ»Π±Π΅Π½Π·ΠΎΠΉΠ½ΠΎΠΉ кислоты) ΠΎΠ±Π½Π°Ρ€ΡƒΠΆΠ΅Π½Ρ‹ ΠΌΠΎΠ»Π΅ΠΊΡƒΠ»Ρ‹ ΠΏΠΎΡ€Ρ„ΠΈΡ€ΠΈΠ½Π° Π² ΠΏΠΎΠ»ΠΈΠ²ΠΈΠ½ΠΈΠ»Π±ΡƒΡ‚ΠΈΡ€Π°Π»ΡŒΠ½ΠΎΠΉ ΠΌΠ°Ρ‚Ρ€ΠΈΡ†Π΅. ЛинСйная Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡ‚ΡŒ скорости фотообСсцвСчивания ΠΏΠΎΡ€Ρ„ΠΈΡ€ΠΈΠ½Π° ΠΎΡ‚ плотности мощности облучСния ΡƒΠΊΠ°Π·Ρ‹Π²Π°Π΅Ρ‚ Π½Π° ΠΎΠ΄Π½ΠΎΡ„ΠΎΡ‚ΠΎΠ½Π½Ρ‹ΠΉ Ρ…Π°Ρ€Π°ΠΊΡ‚Π΅Ρ€ Ρ€Π΅Π°ΠΊΡ†ΠΈΠΈ. ИсслСдовано влияниС Π΄ΠΎΠ±Π°Π²ΠΎΠΊ ΠΏΠΈΡ€ΠΈΠ΄ΠΈΠ½Π° ΠΈ йодистого этила, Π° Ρ‚Π°ΠΊΠΆΠ΅ мСТмолСкулярного кислорода Π½Π° ΡΠΊΠΎΡ€ΠΎΡΡ‚ΡŒ фотодиссоциации ΠΌΠΎΠ»Π΅ΠΊΡƒΠ» ΠΏΠΈΠ³ΠΌΠ΅Π½Ρ‚Π°

    ВонкоструктурныС ΠΊΠΎΠ»Π΅Π±Π°Ρ‚Π΅Π»ΡŒΠ½Ρ‹Π΅ спСктры ΠΈ NH-фотоавтомСрия Π² Π½Π΅Π·Π°ΠΌΠ΅Ρ‰Π΅Π½Π½ΠΎΠΌ 2,3-Π½Π°Ρ„Ρ‚Π°Π»ΠΎΡ†ΠΈΠ°Π½ΠΈΠ½Π΅ со свободным основаниСм Π² Π½Π°Ρ„Ρ‚Π°Π»ΠΈΠ½Π΅ ΠΏΡ€ΠΈ 6 К

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    Spectral-luminescent investigations of freebase unsubstituted 2,3-naphthalocyanine (2,3-Nh2) in naphthalene and tetrakis(tertbutyl)- derivative of 2,3-Nh2 in various solvents at room temperature, 77 and 6 K have been carried out. Π‘Ρ‹Π»ΠΈ ΠΏΡ€ΠΎΠ²Π΅Π΄Π΅Π½Ρ‹ ΡΠΏΠ΅ΠΊΡ‚Ρ€Π°Π»ΡŒΠ½ΠΎ-Π»ΡŽΠΌΠΈΠ½Π΅ΡΡ†Π΅Π½Ρ‚Π½Ρ‹Π΅ исслСдования свободноосновного Π½Π΅Π·Π°ΠΌΠ΅Ρ‰Π΅Π½Π½ΠΎΠ³ΠΎ 2,3-Π½Π°Ρ„Ρ‚Π°Π»ΠΎΡ†ΠΈΠ°Π½ΠΈΠ½Π° (2,3-Nh2) Π² Π½Π°Ρ„Ρ‚Π°Π»ΠΈΠ½Π΅ ΠΈ тСтракис (Ρ‚Ρ€Π΅Ρ‚-Π±ΡƒΡ‚ΠΈΠ»)- ΠΏΡ€ΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ 2,3-Nh2 Π² Ρ€Π°Π·Π»ΠΈΡ‡Π½Ρ‹Ρ… растворитСлях ΠΏΡ€ΠΈ ΠΊΠΎΠΌΠ½Π°Ρ‚Π½ΠΎΠΉ Ρ‚Π΅ΠΌΠΏΠ΅Ρ€Π°Ρ‚ΡƒΡ€Π΅, 77 ΠΈ 6 К

    ВынуТдСнная эмиссия Π² ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Ρ… ΠΎΠ±Ρ€Π°Π·Ρ†Π°Ρ…, Π»Π΅Π³ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… свободным основаниСм Ρ‚Π΅Ρ‚Ρ€Π°Π°Π·Π°ΠΏΠΎΡ€Ρ„ΠΈΠ½Π°

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    Thin cryogenic samples of inert gas solids doped with free-base tetraazaporphine (H2TAP) were irradiated with a tunable pulsed laser. Π‘Ρ‹Π»ΠΈ ΠΎΠ±Π»ΡƒΡ‡Π΅Π½Ρ‹ Ρ‚ΠΎΠ½ΠΊΠΈΠ΅ ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Π΅ ΠΎΠ±Ρ€Π°Π·Ρ†Ρ‹ Ρ‚Π²Π΅Ρ€Π΄Ρ‹Ρ… ΠΈΠ½Π΅Ρ€Ρ‚Π½Ρ‹Ρ… Π³Π°Π·ΠΎΠ², Π΄ΠΎΠΏΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… свободным основаниСм Ρ‚Π΅Ρ‚Ρ€Π°Π°Π·Π°ΠΏΠΎΡ€Ρ„ΠΈΠ½Π° (H2TAP) с пСрСстраиваСмым ΠΈΠΌΠΏΡƒΠ»ΡŒΡΠ½Ρ‹ΠΌ Π»Π°Π·Π΅Ρ€ΠΎΠΌ

    ЭлСктронная спСктроскопия, стимулированноС ΠΈΠ·Π»ΡƒΡ‡Π΅Π½ΠΈΠ΅ ΠΈ стойкоС ΡΠΏΠ΅ΠΊΡ‚Ρ€Π°Π»ΡŒΠ½ΠΎΠ΅ Π²Ρ‹ΠΆΠΈΠ³Π°Π½ΠΈΠ΅ Π΄Ρ‹Ρ€ ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Ρ… Π°Π·ΠΎΡ‚Π½Ρ‹Ρ… ΠΌΠ°Ρ‚Ρ€ΠΈΡ†, Π»Π΅Π³ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… Ρ‚Π΅Ρ‚Ρ€Π°Π±Π΅Π½Π·ΠΎΠΏΠΎΡ€Ρ„ΠΈΠ½ΠΎΠΌ

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    This paper deal with our on-going work on the electronic spectroscopy of tetrapyrrole molecules embedded in cryogenic hosts. Π­Ρ‚Π° ΡΡ‚Π°Ρ‚ΡŒΡ посвящСна нашСй Ρ‚Π΅ΠΊΡƒΡ‰Π΅ΠΉ Ρ€Π°Π±ΠΎΡ‚Π΅ ΠΏΠΎ элСктронной спСктроскопии ΠΌΠΎΠ»Π΅ΠΊΡƒΠ» Ρ‚Π΅Ρ‚Ρ€Π°ΠΏΠΈΡ€Ρ€ΠΎΠ»Π°, встроСнных Π² ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Π΅ хосты

    Electronic spectroscopy, stimulated emission, and persistent spectral hole burning of cryogenic nitrogen matrices doped with tetrabenzoporphin

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    This paper deals with our on-going work on the electronic spectroscopy of tetrapyrrole molecules embedded in cryogenic hosts. Under nanosecond laser excitation of free-base tetrabenzoporphin molecules in a nitrogen matrix at 8K, increasing laser pulse energy results in essential enhancement of the intensity of one or several vibronic emission lines in the fine-structure fluorescence spectrum. Some characteristics of stimulated radiation are realized in the observed intense monochromatic radiation as a result of a transition from the purely electronic S1 level to a vibrational sublevel of the S0 state, corresponding to the excitation of C–C stretching vibrations of tetrapyrrole methane bridges. We also report on persistent spectral hole-burning effects. Hole and antihole formation analysis gives some insight on the photochemical properties of tetrabenzoporphin in a nitrogen matrix
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