I need the diameter for the following molecules/ substrates molecular, if possible please help me with references. As I already identify some substrate diameter, now need to validations.
Try looking at Aylward & Findlay's SI Chemical Data (http://eu.wiley.com/WileyCDA/WileyTitle/productCd-EHEP003043.html). Among other data, it also provides C-C, N-O etc bond lengths in angstrom units plus bond angles - so you could work it out from there......