Application of Raman diffusion to the determination of alkyl chain order in two homologous series of nematogenic compounds was written by Destrade, C.;Guillon, F.;Gasparoux, H.. And the article was included in Molecular Crystals and Liquid Crystals in 1976.Computed Properties of C18H18O This article mentions the following:
The Raman spectra of the homologous series p-methoxy-p’-alkyltolanes (I) and p-methoxybenzilidene-p’-alkylanilines (II; R = C1-C5 alkyl) are determined in isotropic, nematic, and solid phases. The resonance lines of cis and trans bonds were located at â?00 cm-1. From the relative intensity of these lines vs. temperature, one could define a parameter (f), useful in the understanding of the ordering within the alkyl chain. Pretransitional effects, at the I â?N transition, were observed, and established the existence of intramol. chain ordering in the isotropic phase even far from the transition point. This ordering did not exist in the case of nonnematogenic compounds From f was calculated the value of the order parameter S3. In the experiment, the researchers used many compounds, for example, 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1Computed Properties of C18H18O).
1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. Electron-deficient reagents are also stabilized by ethers. For example, borane (BH3) is a useful reagent for making alcohols. Pure borane exists as its dimer, diborane (B2H6), a toxic gas that is inconvenient and hazardous to use. Borane forms stable complexes with ethers, however, and it is often supplied and used as its liquid complex with tetrahydrofuran (THF).Computed Properties of C18H18O