Photoluminescent materials based on PMMA and a highly-emissive octahedral molybdenum metal cluster complex

Abstract

Transparent yet photoluminescent, materials with facile processability are key in many applications.

Superior performance of macroporous over gel type polystyrene as a support for the development of photo-bactericidal materials

“…The hexanuclear molybdenum complex 1 has the valuable property of bright-red room temperature phosphorescence. [24][25][26][27][28][29][30][31][32][33][34][35] In our case solid powder of 1 emitted phosphorescence at λ max = 678 nm, 1@P gel emitted at λ max = 671 nm and 1@P mp displayed emission at λ max = 676 nm. The intensity of both emissions are quenched by oxygen upon exposure of the samples to air.…”

“…For comparison purposes, phosphorescence of 1 in several solvents was recorded at λ max = 671-675 nm (Figure 1d) in accordance with the literature. [24][25][26][27][28][29][30][31][32][33][34][35] The performance of 1@P gel and 1@P mp as bactericidal materials was tested against S.aureus and P.aeruginosa. For both types of microorganisms notable differences were found between the gel-type and macroporous resins, especially in the case of gram positive bacteria.…”

“…22 Recently we have proposed a hexanuclear molybdenum cluster complex (1: [Mo 6 I 8 Ac 6 ] 2-, Ac is acetate; see structure in Figure 1) as photoactive agent for aPDI, 23 owing to its notable photochemical properties. [24][25][26][27][28][29][30][31][32][33][34][35] Regarding the supports for the photoactive agents, a variety of materials have been described in the literature, like polyurethane, cellulose, nylon, chitosan, silica and polystyrene. [13][14][15][16][17][18][19][20] This last polymer is one of the most popular supports employed so far, dating back to the pioneering works of Schaap and Neckers.…”

Cellular internalisation, bioimaging and dark and photodynamic cytotoxicity of silica nanoparticles doped by {Mo6I8}4+ metal clusters

“…Firstly, similarly to their structural analogues, hexarhenium clusters [{Re 6 Q 8 }L 6 ] m (Q = S or Se), these complexes demonstrate high chemical and photostability of the cluster cores {Mo 6 X 8 } 4+ that are primarily responsible for their triplet excited state photoluminescence (i.e. 4,5,11,15 Additionally, the metal cluster complexes can also act as powerful photosensitisers in the singlet oxygen ( 1 O 2 ) generation, [5][6][7][8][16][17][18] which makes them especially interesting for applications associated with the generation of singlet oxygen in vivo, such as, for example, photodynamic therapy (PDT). Secondly, their broad emission spectra extend in the red/near infra-red region (from ∼550 to more than 950 nm) 4-13 overlapping the so called "optical tissue window" (650 − 900 nm), where the boundaries of the region are defined by the minimal light absorption of hemoglobin (< 650 nm) and water (> 900 nm).…”

Luminescent coordination polymers based on Ca2+ and octahedral cluster anions [{M6Cli8}Cla6]2− (M = Mo, W): synthesis and thermal stability studies

“…Indeed, depending on X and L, some members of this family demonstrate intensive luminescence in the red/near-infrared region with emission lifetimes of hundreds of microseconds and often with significant quantum yields. [11][12][13][14][15][16][17] Due to these properties, materials based on these clusters have been demonstrated to have potential in solar energy harvesting, 18,19 bioimaging, photodynamic therapy, [20][21][22] photo-catalysis, [23][24][25][26][27] oxygen sensing, [28][29][30][31] lighting, [32][33][34] etc.…”