Fourier transform infrared spectroscopy study of hydrogen-bonded complexes involving hydroxylic derivatives and N,N,1,9-tetramethylguanine

Abstract

The interaction between water and phenols and NJV, 1,9-tetramethylguanine (TMG) has been investigated by FT-IR spectroscopy. The thermodynamic data for complex formation have been determined in 1,2-dichloroethane. The analysis of the spectra in the v0h and vc=0 region strongly suggests that the interaction occurs at the 06 and N7 atoms of TMG. This result is compared with ab initio calculations on the conformation of the guanine-water dimer.Equimolar mixtures of a 2-diazo-1-naphthaquinone and a phenolic resin are exposed to a 25-kV electron beam and UV light. The mechanism for the photochemistry is explained on the basis of the well-known Wolff rearrangement. The electron beam exposure, however, does not appear to proceed via the Wolff rearrangement but instead invokes reactions of a carbene with the phenolic resin. The carbene, formed by loss of N2 from the diazoketone, forms chemical products with the resin which are soluble in base. In essence, this explains the functioning of a large class of electron beam resists consisting of diazoketone/resin mixtures. Electron beam exposures are also performed on mixtures of 2-diazo-1-naphthaquinone in m-cresol or in benzene; the results of these experiments suggest that a major product of the electron beam induced chemistry is a substituted naphthol.

Ft‐Ir study of the interaction between N, N,1,9‐tetramethylguanine and the Li+ Ion. Comparison with protonation

“…TMG has been synthetized by a previously described procedure (21). The complex between TMG and Lil has been studied in acetonitrile as a solvent.…”