Molecules bond lengths and angles

The structural parameters of the 2,2-bithiophene (q -2T) molecule (bond lengths and angles) were first reported in the early 1950 s by Bastiansen and Almenningen in a series of articles [69, 70]. These parameters were obtained from electron diffraction measurements on a-2T vapour and are in good agreement with values obtained on thiophene by microwave investigation [71]. In the gas phase, the molecule is not planar and has an anti conformation with a twist angle of 34° that the authors attribute to steric hindrance between the S atom and the nearest H atom. 

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