Intermolecular interaction of photoexcited Cu(TMpy-P4) with water studied by transient resonance Raman and picosecond absorption spectroscopies

photoinduced complex between Cu(TMpy-P4) and water molecules, reversibly axially coordinated to the central metal, was observed in picosecond transient absorption and nanosecond resonance Raman experiments. This complex is rapidly created (τ1 = 15 ± 5 ps) in the excited triplet (π, π*) state of Cu-porphyrin, and the subsequent relaxation is proposed to proceed via two parallel pathways. One is fast and efficient (≥90% of molecules), and presumably involves a (π, d) charge-transfer state. The second pathway is slow (τ2 >> 1 ns), has a low quantum yield (≤10%) and involves the excited (d, d) state which is responsible for transient Raman features at ≈ 1553 cm−1 (ν2*) and ≈ 1347 cm−1 (ν4*), and for low-intensity long-lived transient absorption features

ВЫСОКОЧУВСТВИТЕЛЬНЫЕ ЛАЗЕРНЫЕ ФЛУОРОМЕТРЫ ДЛЯ БЛИЖНЕГО ИНФРАКРАСНОГО И ВИДИМОГО ДИАПАЗОНОВ

Laser spectrometers for registration of luminescent signals with nanosecond temporal resolution are presented. The versatile spectrometer is capable to operate with up to tenth of nanometer resolution in wide spectral range. The specialized spectrometer for singlet oxygen luminescence measuring in vitro and in vivo possesses unique sensitivity in the near infrared region. Experimental results confirming high technical capacities of the setups are presented.Представлены лазерные флуорометры, способные регистрировать сигналы люминесценции с наносекундным временным разрешением. Универсальный флуорометр позволяет работать в широком спектральном диапазоне с разрешением вплоть до десятых долей нанометра. Специализированный флуорометр для измерения свечения синглетного кислорода in vitro и in vivo обладает уникальной чувствительностью в ближней инфракрасной области. Приведены экспериментальные результаты, подтверждающие высокие технические возможности установок

HIGHLY SENSITIVE LASER SPECTROMETERS FOR NEAR INFRARED AND VISIBLE RANGES

Laser spectrometers for registration of luminescent signals with nanosecond temporal resolution are presented. The versatile spectrometer is capable to operate with up to tenth of nanometer resolution in wide spectral range. The specialized spectrometer for singlet oxygen luminescence measuring in vitro and in vivo possesses unique sensitivity in the near infrared region. Experimental results confirming high technical capacities of the setups are presented