Role of Hydrogen Bonding on the Self-Organization of Phenyleneethynylenes on Surfaces was written by Zalake, Pratap;Thomas, K. George. And the article was included in Langmuir in 2013.Recommanded Product: 313648-56-5 This article mentions the following:
A series of carboxylic acid substituted phenyleneethynylenes, having a rigid backbone of 2.7 ± 0.1 nm, were synthesized by following the Heck-Cassar-Sonogashira-Hagihara cross-coupling reaction. Hydrogen bonding, through the formation of cyclic dimers of carboxylic acid, is more preferred over catemeric structures in all the mol. systems under investigation. The formation of extended two-dimensional patterns on highly oriented pyrolytic graphite (HOPG) surface is dictated by the position as well as number of the carboxylic acid groups on the phenyleneethynylenes. Highly ordered extended arrangements, in the linear and stepwise fashion, were observed when the carboxylic acid groups are attached in the para and meta positions of phenyleneethynylenes. The vital role of the number of carboxylic acid on the organization of mols. is evident in the case of tetracarboxylic acid derivative wherein a Kagome-type structure was observed Further, the coassembly of two types of phenyleneethynylenes was achieved on HOPG surface through acid base interaction. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Recommanded Product: 313648-56-5).
Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Recommanded Product: 313648-56-5
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics