The present data shown in Table 1 indicate that change of spacer groups in molecular skeletons can have a profound effect on the gelation abilities of the studied imide compounds, which is similar to some systems in our previous reports about organogels[24, 34 36].
The cooperative molecular reorientation in methacrylate copolymer films with hexamethylene spacer groups terminated with 4-oxybenzoic acid (BA) and 4- 4-methoxycinnamoyloxy biphenyl (MCB) in their side chains was investigated by irradiating with linearly polarized ultraviolet light (LPUV) and subsequent annealing.
The alternative scenario of integer charge transfer (ICT) has been invoked for an equally broad range of systems, in particular for weakly interacting interfaces, when the frontier molecular orbitals cannot hybridize with the metal substrate due to spacer groups, when the substrate is chemically inert, or when molecules and metal are electronically decoupled by an ultrathin buffer layer.
The oxygen groups can then be removed to leave graphene sheets, but without some kind of molecular spacer, the sheets simply form useless clumps.
Molecular dynamic simulations were undertaken on the sodium poly[ 4-styrenesulfonyl) (trifluoromethanesulfonyl) imide] P(STFSINa) homopolymer and its copolymers with either ether or styrene spacer groups to investigate the spacer length and polarity dependence of Na-ion transport.
Four different spacer groups were investigated.
Burrard-Lucas, M. et al. Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer.
Gly is added as molecular spacer to improve hydrogel viscosity and mechanical properties.
As for CH-C3 with an additional diphenyl group linked by ether band in the spacer part, the combination of a flexible ether band and a rigid diphenyl segment in the molecular spacer with π-π stacking seemed more suitable to adjust molecular conformation to self-assemble and form organized stacking nanostructures.
In addition, as for CH-C4 with a five-carbon alkyl substituent chain linked by phenoxy ether band in the molecular spacer, the number of formed organogels shifted to 4. Furthermore, for the case of CH-N1 with a hydrophilic diethylene spacer containing an amino group, only one kind of organogel can form in pyridine.
