title: Molecular pillar supported graphene oxide framework: conformational heterogeneity and tunable d-spacing.
abstract: n-Alkylamines were grafted on the basal plane oxygen functionalities of graphene oxide (GO), yielding molecular pillar supported graphene oxide frameworks (GOFs) with tunable interlayer spacing. A major fraction of n-alkylamines was found to covalently interact with the basal plane epoxy groups via nucleophilic substitution reactions. The d-spacing in GOFs could be tailored between 10.5 and 28.9 Å by varying the chain length of the n-alkylamines. (13)C SSNMR explicitly showed the coexistence of both trans and gauche conformation modes. The relative populations of these modes control the conformational heterogeneity and orientation of n-alkylamines in the GOFs. A plausible bilayer structural model of the GOFs was demonstrated. The terminal methyl and methylene units of the n-alkylamines grafted on the GO basal plane were interdigitated with the counter layer and afforded a double-layer structure of alkyl chain supported GOFs.
authors.affiliation: Chemical Science Division, CSIR-Indian Institute of Petroleum, Dehradun - 248005, India. opkhatri@iip.res.in.
authors.forename: Harshal P
authors.initials: HP
authors.lastname: Mungse
authors.forename: Raghuvir
authors.initials: R
authors.lastname: Singh
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sugimura
authors.forename: N
authors.initials: N
authors.lastname: Kumar
authors.forename: Om P
authors.initials: OP
authors.lastname: Khatri