1 Unraveling the Molecular Recognition of “three methylene spacer” Bis(benzimidazolium) Moiety by Dibenzo-24-crown-8: Pseudorotaxanes Under Study Chhanda Mukhopadhyay*, Sabari Ghosh and Ann Marie Schmiedekamp Supplementary Information Part 1 (1) General procedure for preparation of solutions for pseudorotaxane formation: Index 2 (2) Association constant determination: 2 (3) Materials and methods: 2 (4) 2 Scheme S1. (5) Spectral data of the pseudorotaxane followed by that of its corresponding salt: 3 (6) Spectral data for the compound 5,6-Dimethyl-2, 2'-(1,3-propanediyl)bis-1H-benzimidazole: 7 (7) Solubility chart: 8 (8) Calculation Methods: 8 (9) Details of DFT calculations: 8 Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry This journal is © The Royal Society of Chemistry 2011