Dissolved Organic Matter Singlet Oxygen Quantum Yields: Evaluation Using Time-Resolved Singlet Oxygen Phosphorescence

Singlet Oxygen

Singlet oxygen (O2) is a higher energy state molecular oxygen species. It is one of the most active intermediates involved in chemical and biochemical reactions. To fully appreciate the reactivity of O2, it is necessary to understand its physical and chemical nature. This paper reviews the generation, quenching and detection of O2. Its properties, possible chemical reactions are presented as we...

Singlet Oxygen: a Reagent in Organic Synthesis

In the introduction, the generation, the electronic state and the reaction of singlet oxygen (102) with carbon—carbon double bonds is described. For preparative purposes, 102 is generated by dye-sensitized excitation of oxygen (02). The photo-oxygenation reaction leads to the formation of peroxides, which can be used as intermediates in the organic synthesis. Described are processes of preparat...

Singlet Oxygen Quantum Yields (φD) in Water using Beetroot Extract and an Array of LEDs

É proposta uma estratégia simples e barata para determinar rendimentos quânticos (φD) de oxigênio singlete (O 2 ) de fotossensibilizadores (PS) em água utilizando extrato de beterraba contendo betacianina (Bc) e um conjunto de diodos emissores de luz (LEDs) para excitação. Bc, um corante catiônico natural, foi obtida por purificação através de cromatografia a partir do extrato de beterraba verm...

Singlet Oxygen Trapping Porphyrins

Fiber-optic Singlet Oxygen

Traditionally, Type II heterogeneous photo-oxidations produce singlet oxygen via external irradiation of a sensitizer and external supply of ground-state oxygen. A potential improvement is reported here. A hollow-core fiber-optic device was developed with an ‘‘internal’’ supply of light and flowing oxygen, and a porous photosensitizer-end capped configuration. Singlet oxygen was delivered throu...