TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: A monolayer is formed on the substrate so that the organic silane compound is positioned at the substrate side, and the hydrocarbon (A) sets is positioned at the silyl group and film surface side. The hydrocarbon (A) set functions as a protective film which protects the molecule portion other than the (A) set. The functional film is formed by organic group (C) connecting 1-8 unit linear. Preferred Definitions:    A=linear aliphatic hydrocarbon;and    C=organic group comprising unit(s) selected from monocyclic ring type aromatic ring unit, condensed system aromatic ring unit, monocyclic ring type aromatic heterocyclic unit, condensed system aromatic heterocyclic unit and unsaturated aliphatic unit, preferably units selected from benzene ring unit, thiophene ring unit and acene ring unit.    EXAMPLE - Terphenyl was dissolved in N-chlorosuccinimide, chloroform and acetic acid solution. Terminal hydrogen was chlorinated and the resulting solution was added into a flask in nitrogen atmosphere and stirred. 4-chloroterphenyl was obtained. The obtained 4-chloroterphenyl was dissolved in sodium carbonate, sodium hydroxide and tetrahydrofuran (THF), and mixed with excess pure water. The chlorinated terminal was hydroxylated by reacting the solution at 100 degrees C. The hydroxyl group was etherified by mixing 4-hydroxyl-terphenyl with n-octyl bromide, sodium hydroxide, THF and pure water. 4-octoxy-terphenyl was chlorinated and the product was formed into terminal triethoxy silyl using Grignard reaction. Chloroform extraction of the product was performed into triethoxy silyl. The obtained product was dried with magnesium sulfate, then solvent was removed, recrystallized with methanol solvent, and purified with silica gel using chloroform solvent, and pi-electron conjugation system organic silane compound of formula (1A) was obtained. The orientation angles of bond of terphenyl structure and octyl group were each 161 degrees and 140 degrees.