Photophysical Properties of Upconverting Nanoparticle–Phthalocyanine Complexes

Gvozdev, D.A.; Лукашев, Е. П.; Gorokhov, V. V.; Пащенко, В. З.

doi:10.1134/s0006297919080078

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…In this case, the PS-NP conjugate must be created on the basis of non-covalent interactions [5,6]. Second, the NP can be given additional functionality; for example, it can be used as a lightharvesting antenna that enhances the absorption capacity of the PS in the visible [7,8] or IR region [9,10] of the spectrum. Thus, the PS will mediate photodynamic reactions when combined with NPs and, therefore, the PS-NP complex should be stable.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of Carboxy-Substituted Phthalocyanines Conjugated with Nanoparticles under High Stoichiometric Ratios

et al. 2022

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Background: The search of the approaches towards a photosensitizer’s conjugation with multifunctional nanoparticles is an important step in the development of photodynamic therapy techniques. Association of photosensitizer molecules with nanoparticles that perform the delivery function can lead to a change in the functional state of the photosensitizer. Methods: We studied the effects observed upon incorporation of octa- and hexadeca-carboxyphthalocyanines of zinc(II) and aluminum(III) (Pcs) into the polymer shell of nanoparticles with a semiconductor CdSe/CdS/ZnS core with various spectral and optical methods. Results: First, the interaction of Pc with the polymer shell leads to a change in the spectral properties of Pc; the effect strongly depends on the structure of the Pc molecule (number of carboxyl groups as well as the nature of the central cation in the macrocycle). Secondly, upon incorporation of several Pc molecules, concentration effects become significant, leading to Pc aggregation and/or nonradiative energy transfer between neighboring Pc molecules within a single nanoparticle. Conclusions: These processes lead to the decrease of a number of the Pc molecules in an excited state. Such effects should be taken into account during the development of multifunctional platforms for the delivery of photosensitizers, including the use of nanoparticles as enhancers of photosensitizer activity by energy transfer.

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Section: Introductionmentioning

confidence: 99%

Fluorescence Quenching of Carboxy-Substituted Phthalocyanines Conjugated with Nanoparticles under High Stoichiometric Ratios

et al. 2022

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“…The probability of this process depends both on the structural properties of the PS molecule (the type of metal atom, the nature and number of peripheral substituents) and on the structural features of the organic shell of the LNP. Thus, we have shown that despite the presence of eight peripheral carboxyl groups, zinc and aluminum Pcs aggregate upon binding to upconversion LNPs coated with a polymer shell containing terminal amino groups; zinc Pcs undergo aggregation at lower concentrations than aluminum Pcs do [ 107 ]. In this case, the PS aggregates continue to accept the electronic excitation energy of the LNP and the efficiency of this process may increase due to the greater overlap of the absorption spectrum of the aggregates with the luminescence spectrum of the LNP.…”

Section: Design Optimization For Hybrid Complexesmentioning

confidence: 99%

Hybrid Complexes of Photosensitizers with Luminescent Nanoparticles: Design of the Structure

et al. 2021

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Increasing the efficiency of the photodynamic action of the dyes used in photodynamic therapy is crucial in the field of modern biomedicine. There are two main approaches used to increase the efficiency of photosensitizers. The first one is targeted delivery to the object of photodynamic action, while the second one is increasing the absorption capacity of the molecule. Both approaches can be implemented by producing dyenanoparticle conjugates. In this review, we focus on the features of the latter approach, when nanoparticles act as a light-harvesting agent and nonradiatively transfer the electronic excitation energy to a photosensitizer molecule. We will consider the hybrid photosensitizerquantum dot complexes with energy transfer occurring according to the inductive-resonance mechanism as an example. The principle consisting in optimizing the design of hybrid complexes is proposed after an analysis of the published data; the parameters affecting the efficiency of energy transfer and the generation of reactive oxygen species in such systems are described.

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Effect of cationic antiseptics on fluorescent characteristics and electron transfer in cyanobacterial photosystem I complexes

Paschenko¹,

Лукашев²,

Mamedov³

et al. 2023

Photosynth Res

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Photophysical Properties of Upconverting Nanoparticle–Phthalocyanine Complexes

Cited by 6 publications

References 29 publications

Fluorescence Quenching of Carboxy-Substituted Phthalocyanines Conjugated with Nanoparticles under High Stoichiometric Ratios

Fluorescence Quenching of Carboxy-Substituted Phthalocyanines Conjugated with Nanoparticles under High Stoichiometric Ratios

Hybrid Complexes of Photosensitizers with Luminescent Nanoparticles: Design of the Structure

Effect of cationic antiseptics on fluorescent characteristics and electron transfer in cyanobacterial photosystem I complexes

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