Water-soluble hybrid materials based on {Mo₆X₈}⁴⁺ (X = Cl, Br, I) cluster complexes and sodium polystyrene sulfonate

Abstract

A water-soluble form of {Mo6X8}4+ clusters was developed.

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.…”

Molybdenum Iodides – from Obscurity to Bright Luminescence

“…Water is a well‐known luminescence quencher due to non‐radiative relaxations via O‐H vibrations. No incorporation into the PSS matrix was observed for (Bu 4 N) 2 [Mo 6 I 8 (CH 3 COO) 6 ] which contains non‐labile acetate ligands . (Bu 4 N) 2 [Mo 6 I 8 (NO 3 ) 6 ] was also grafted to SH‐modified polystyrene (with –CH 2 SH functional groups).…”

“…These observations have made molybdenum iodide cluster complexes rather attractive for a diverse range of practical applications in biology and medicine (e.g. as photodynamic therapeutic agents, photosensitizers, imaging agents) and analytical chemistry (for detection of trace amounts of molecules which can trigger or quench the luminescence, such as dioxygen or fluoroquinolone antibiotics) , …”