ИСТИНА

Oligogermanes may be regarded as models for producing molecular wires. In fact, electrons of single Ge-Ge bond are delocalized across the entire backbone of these molecules. Therefore existence of σ-delocalization in oligogermanes results to appearance of properties similar to unsaturated hydrocarbons (conductivity, thermochromism, non-linear optical properties). It can be assumed that producing unsymmetric digermanes, where each germanium atom has substituents with definite electronic properties, allows obtain compounds with specific features. It may be supposed that most sensible changes in properties appear by introduction of very different substituents (electron-donating or electron-withdrawing) to the end germanium atoms of oligogermane chain. In the course of this work the number of oligogermanes with unsymmetric substituents were synthesized and investigated by UV/visible spectroscopy. The composition of the compounds obtained was established on the basis of elemental analysis, and structure was investigated in solution by NMR spectroscopy and in solid state by X-ray analysis.