Electronic transport through electron-doped Metal-Phthalocyanine Materials

We report an insulator-metal-insulator transition in films of five metal phthalocyanines (MPc) doped with alkali atoms. Electrical conduction measurements demonstrate that increasing the alkali concentration results in the formation of a metallic state for all systems. Upon further doping, the films reenter the insulating state. Structural and Raman spectroscopy studies reveal the formation of new crystalline phases upon doping and are consistent with the phenomena originating from charge transfer between the intercalated alkali atoms and MPc, in a similar fashion to what has been so far observed only in C60. Due to the presence of a molecular spin, large exchange energy, and a two-fold orbital degeneracy in MPc, our findings are of interest in the study of controllable magnetism in molecular materials and in the investigation of new, recently predicted electronic phases.Comment: Replaced with published versio

Hydrogen bonding interactions of benzylidene type Schiff bases studied by vibrational spectroscopic and computational methods

The structural features of four benzylidene type Schiff bases [(E)-benzaldehyde-N-phenyl imine, (A) (E)-2-hydroxybenzaldehyde-N-phenyl imine (B) (E)-benzaldehyde-N-2-hydroxyphenyl imine (C) (E)-2-hydroxybenzaldehyde-N-2-hydroxyphenyl imine (D)] were studied by FT-IR spectroscopy in solution, photoacoustic and Raman spectroscopies in the solid state and quantum chemical calculations. It was found that molecule D dimerised in the solid state with concomitant loss of aromaticity in the benzylidene ring. Beside the intermolecular C=O...HO hydrogen bonds, intramolecular N-H...C=O hydrogen bonds could be found experimentally as well as computationally. Spectra taken in solution and ab initio quantum chemical calculation helped to identify hydrogen bonding interactions occurring for compounds B and C. Intramolecular OH...N hydrogen bond predominated in molecule B, while this interaction, although it existed, was weaker

1-[(4-{[(2-Oxo-1,2-dihydro­naphthalen-1-yl­idene)meth­yl]amino}­anilino)methyl­idene]naphthalen-2(1H)-one dihydrate

The title compound, C28H20N2O2·2H2O, comprises a Schiff base mol­ecule with an imposed inversion centre in the middle of p-phenyl­enediamine unit and water mol­ecules of crystallization. In the structure, the Schiff base mol­ecule is present as the keto–amino tautomer with a strong intra­molecular N—H⋯O hydrogen bond. The Schiff base mol­ecules and water mol­ecules of crystallization create infinite [010] columns through O—H⋯O hydrogen bonds. Inter­molecular attractions within columns are through additional π–π inter­actions [centroid–centroid distance = 3.352 (1) Å] between parallel Schiff base mol­ecules. The columns are joined into infinite (011) layers through weak C—H⋯O hydrogen bonds. The layers pack in an assembly by van der Waals attractions, only being effective between bordering non-polar naphthalene ring systems

光音響分光法による絶縁性固体の非発光過程の研究

金沢大学工学部研究課題/領域番号:57550008, 研究期間(年度):1982出典：研究課題「光音響分光法による絶縁性固体の非発光過程の研究」課題番号57550008（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-57550008/）を加工して作