A Series of Isopropyl-Substituted Oligogermanes (Pr3Ge)-Ge-i(GePh2)(n)GePr3i (n=0-3) Featuring a Luminescent and Dichroic Pentagermane (Pr3Ge)-Ge-i(GePh2)(3)GePr3i

作者：Komanduri Sangeetha P; Shumaker F Alexander; Roewe Kimberly D; Wolf Melanie; Uhlig Frank; Moore Curtis E; Rheingold Arnold L; Weinert Charles S

来源：Organometallics, 2016, 35(18): 3240-3247.

DOI：10.1021/acs.organomet.6b00596

The series of oligogermanes (Pr3Ge)-Ge-i(GePh2)(n)GePr3i (n = 0, 2; n = 1, 3; n = 2, 4; n = 3, 5) were prepared by the hydrogermolysis reaction. All four species were characterized by NMR (H-1 and C-13) and UV/visible spectroscopy as well by cyclic voltammetry and differential pulse voltammetry. The oligogermanes exhibited a successive red shift in their absorbance maxima as the length of the Ge-Ge chain was increased, and these molecules also became easier to oxidize as the chain length was increased. The X-ray crystal structures of 4 and 5 as well as the trigermane HPh2GeGePh2GePh2H (6) were determined. The pentagermane 5 was shown to be dichroic in the solid state due to the packing of the individual molecules in a columnar fashion in the crystal. Pentagermane 5 is also luminescent in solution, exhibiting an emission maximum at 380 nm. The physical properties of 5, like the hexagermane (Pr3Ge)-Ge-i(GePh)(4)GePr3i, mimic the properties of the larger polygermane systems.

• 出版日期2016-9-26