First Example of an Octahedral Rhenium Telluride Cluster Complex with an Organic N-Donor Ligand

The [{Re 6 Te 8 }(imzH) 6 ] 2+ cationic cluster complex prepared by the interaction of [{Re 6 Te 8 } (TeI 2 ) 6 ]I 2 ·[{Re 6 Te 8 }(TeI 2 ) 4 (TeI 3 ) 2 ]·I 2 with imidazole (imzH) in a sealed glass ampoule at 200 °C for 48 h. The composition of the obtained compound is confirmed by 1 H NMR spectroscopy and high-resolution mass spectrometry. The single crystals suitable for SC-XRD are prepared by slow diffusion of diethyl ether vapors into a solution of the complex in DMF. According to the SC-XRD data, the resulting complex has the composition [{Re 6 Te 8 }(imzH) 6 ]I 2 ·2/3DMF. The compound crystallizes in the monoclinic crystal system, P 2 1 / c space group, with the following unit cell parameters: a = 18.0379(4) Å, b = 17.9945(5) Å, c = 33.1318(7) Å, β = 115.1829(10)°, V = 9732.0(4) Å 3 , Z = 6. It is also shown that this compound exhibits solid-state luminescence with an emission maximum at 730 nm characteristic of octahedral rhenium cluster complexes.