Preparation and properties of bis(triphenylphosphine)iminium tetradecabromohexatungstate

Preparation and Luminescence of Cluster Compounds [W6Br8L6]2– with L = CF3COO and C7H7SO3

“…The electronic structure of [M 6 X 14 ] 2-clusters appears sufficiently well understood, [3][4][5] and photophysical studies have been carried out since the late 1980s. [6][7][8][9][10][11] Detailed accounts on the binary tungsten bromides W 6 Br 12 , W 6 Br 14 , W 6 Br 16 , and W 6 Br 18 have been published by Siepmann [1] and von Schnering [2] in 1968, followed by extensive work on tungsten halide clusters by Hogue and McCarley in 1970. [12] Single-crystal structures of A 2 [W 6 Br 14 ] (A = K, Rb, and Cs) have been reported in 1998.…”

“…[6][7][8][9][10][11] Detailed accounts on the binary tungsten bromides W 6 Br 12 , W 6 Br 14 , W 6 Br 16 , and W 6 Br 18 have been published by Siepmann [1] and von Schnering [2] in 1968, followed by extensive work on tungsten halide clusters by Hogue and McCarley in 1970. [12] Single-crystal structures of A 2 [W 6 Br 14 ] (A = K, Rb, and Cs) have been reported in 1998. [13] For the sake of completeness, compounds with [W 6 Br 14 ] 2-have also been reported with Ag + , [14] Cu + , [15] Tl + , [16] and Cd 2+ .…”

“…[12] Single-crystal structures of A 2 [W 6 Br 14 ] (A = K, Rb, and Cs) have been reported in 1998. [13] For the sake of completeness, compounds with [W 6 Br 14 ] 2-have also been reported with Ag + , [14] Cu + , [15] Tl + , [16] and Cd 2+ . [17] Preparations of all these compounds were usually accomplished by high temperature solid-state reactions from appropriate proportions of W 6 isolated from dichloromethane solution and structurally characterized by means of X-ray single-crystal diffraction.…”

“…[13] For the sake of completeness, compounds with [W 6 Br 14 ] 2-have also been reported with Ag + , [14] Cu + , [15] Tl + , [16] and Cd 2+ . [17] Preparations of all these compounds were usually accomplished by high temperature solid-state reactions from appropriate proportions of W 6 isolated from dichloromethane solution and structurally characterized by means of X-ray single-crystal diffraction. Photoluminescence studies reveal a wide excitation range within 250 to 500 nm for both compounds and a broad emission centered at λ em,max = 735 nm (L = CF 3 COO) and 730 nm (L = C 7 H 7 SO 3 ).…”

“…[5,11,[18][19][20][21] Parallel to this development we have started to synthesize tungsten iodide cluster compounds, including octahedral cluster compounds and to perform ligand substitutions. [22] Among them, (TBA) 2 6 ]. [21] Although it has been reported that the iodide cluster [W 6 I 8 I 6 ] 2-is showing the highest luminescence quantum yields (in solution, 39 %) among halides (Cl, Br, I) [10] …”