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A Highly Luminescent Hexanuclear Molybdenum Cluster – A Promising Candidate toward Photoactive Materials

“…The [Mo 6 I 8 (CF 3 CO 2 ) 6 ] 2cluster unit contains trifluoroacetate ligands coordinated to Mo 6 I i 8 through one of the oxy-gen atoms of the carboxylate function ( Figure 1; Table S1 and Figure S2 in the Supporting Information 6 ]. The presence of six apical trifluoroacetate ligands leads to a decrease of the molar absorption coefficients and, as observed in (nBu 4 N) 2 [Mo 6 Cl 8 (CF 3 CO 2 ) 6 ], [12] to a blueshift of the absorption onset and luminescence band (Figure 3). The 2@SiO 2 and 2@PU composites were prepared by the Stöber method [19] and electrospinning, respectively ( Figure 2).…”

“…Of all M 6 cluster complexes, [Mo 6 Cl 14 ] 2has been the most extensively studied so far with emission in the 600-900 nm range and a high luminescence quantum yield (Φ L = 0.19), high oxygen quenching constant, and ties are desirable for the construction of luminescent probes of oxygen, photoactive materials for oxidation reactions with easily separable active carriers, and bactericidal textile surfaces upon daylight irradiation. However, despite a number of luminescent complexes containing the Mo 6 Cl i 8 cluster core associated with L a ligands such as halides, [10] sulfonates, carboxylates, [11][12][13] or thiolates, [14,15] the area of the Mo 6 I i 8 cluster cores still remains less explored. [9,10] A weak absorption in the visible region can be overcame by using complexes containing the Mo 6 I i 8 cluster core characterized by an absorption onset that extends to the red spectral region.…”

Synthesis, crystal structure, and photophysical properties of acid (H3O)2[{W6Br8}Br6] · 4H2O

“…Tens of works presenting the luminescence proper ties of various octahedral molybdenum and rhenium clusters have been published to date [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. However, the photophysical properties of the W 6 clusters are poorly studied.…”

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It is well known that upon UV irradiation many chalcogenide and halide hexanuclear clusters of tran sition metals, for example, [{Re 6 Q 8 }L 6 ] (Q = S, Se) and [{M 6 X 8 }L 6 ] (M = Mo, W; X = Cl, Br), where L are various inorganic and organic ligands, luminesce in the red spectral range with microsecond emission life times [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Phosphorescence in the red spectral range and, as a consequence, the ability to generate singlet oxygen, as well as specific features of the struc tures of similar octahedral clusters of heavy metals, suggest that these compounds are potentially promis ing for the use as photosensitizers in photodynamic therapy and as X ray contrast preparations in diagnos tics of oncological diseases.

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Photophysical Properties of a Series of Rhenium Selenide Cluster Complexes Containing Nitrogen‐Donor Ligands

“…[1] Their studies detailed the long excited-state lifetime of [Mo 6 (μ 3 -Cl) 8 -Cl 6 ] 2as well as other molybdenum and tungsten halide cluster complexes. [5][6][7] Since then, the luminescence properties of a wide variety of 24-electron Mo-and Re-based hexanuclear clusters have been reported, [8][9][10][11][12][13][14] including fundamental studies that probed the nature of the excited state. [5][6][7] Since then, the luminescence properties of a wide variety of 24-electron Mo-and Re-based hexanuclear clusters have been reported, [8][9][10][11][12][13][14] including fundamental studies that probed the nature of the excited state.…”