Studies of the Raman Effect of Organic Substances. V. Raman Effect of Homo-Cyclic Compounds

Abstract 1. The Raman spectra of the following substances have been measured: benzene, cyclohexane, phenyl-cyclohexane, di-cyclohexyl, indene, naphthalene, tetrahydro-naphthalene, decahydro-naphthalene, tetrahydro-acenaphthene, decahydro-acenaphthene, decahydro-pyrene, and perhydro-pyrene. 2. A complete Raman spectrum of cyclohexane has been obtained. 3. Considering phenyl-cyclohexane, tetrahydro-naphthalene, tetrahydroacenaphthene, and decahydro-pyrene as the substitution products of benzene as well as of cyclohexane, the Raman frequencies of these substances have been classified into three groups, i. e., the first due to the benzene ring, the second due to the cyclohexane ring, and the third due to the combination of the two. 4. The disappearance of Δν and 1000 cm−1. in the di-derivatives (ortho) of benzene has been confirmed even in the case of the condensed ring compounds, such as indene, naphthalene, and tetrahydro-naphthalene. 5. The oscillation of the two forms of indene, i. e. (Remark: Graphics omitted.), has been explained.