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Raman study of order-disorder phase transitions in polydialkylmetallanes of the type [R2M]n: organometallic polymers with the main chain consisting entirely of either Si, or Ge, or Sn atoms

Variable-temperature Raman studies were carried out for some representatives of a novel class of industrially promising (sigma) -conjugated polymers-polymetallanes of the type (R2M)n, M equals Si, Ge, Sn. Electronic-conformational nature of the thermochromic phase transitions of order- disorder type exhibited by some of these polymers was investigated. The applicability of Shorygin's semi-classical approach to the pre-resonant Raman intensity enhancement was confirmed experimentally by the example of polysilanes.