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Journal Articles

Crystal structure, photomagnetic and dielectric properties of a cyanido-bridged Cu-Mo assembly film

Ikeda, Yusuke*; Matsumura, Daiju; Tsuji, Takuya; Namai, Asuka*; Imoto, Kenta*; Tokoro, Hiroko*; Nakabayashi, Koji*; Okoshi, Shinichi*

Inorganica Chimica Acta, 550, p.121434_1 - 121434_8, 2023/03

https://doi.org/10.1016/j.ica.2023.121434

Times Cited Count：0 Percentile：0.00(Chemistry, Inorganic & Nuclear)

Journal Articles

Formation and thermochemical properties of oxychlorides of niobium (Nb) and tantalum (Ta); Towards the gas-phase investigation of dubnium (Db) oxychloride

Chiera, N. M.; Sato, Tetsuya; Tomitsuka, Tomohiro; Asai, Masato; Suzuki, Hayato*; Tokoi, Katsuyuki; Toyoshima, Atsushi; Tsukada, Kazuaki; Nagame, Yuichiro

Inorganica Chimica Acta, 486, p.361 - 366, 2019/02

https://doi.org/10.1016/j.ica.2018.10.032

Times Cited Count：4 Percentile：20.86(Chemistry, Inorganic & Nuclear)

The formation of NbOCl and TaOCl and their adsorption behavior on quartz surfaces was explored by applying an isothermal gas-chromatographic method. Trace amounts of short-lived Nb and Ta isotopes were used. Adsorption enthalpy values ( $Delta H_{rm ads}$ ) at zero surface coverage of - $Delta H_{rm ads}$ (NbOCl) = 102 4 kJ/mol and - $Delta H_{rm ads}$ (TaOCl) = 128 5 kJ/mol were determined by analyzing the chromatographic behavior of the Nb andTa complexes with a Monte-Carlo simulation method based on an adsorption-desorption kinetic model.By applying an empirical correlation, the experimental $Delta H_{rm ads}$ values were successively related to the macroscopic standard sublimation enthalpy, $Delta H^circ _{rm subl}$ , as a measure of the volatility of each substance. The inferred sublimation enthalpies are in agreement with tabulated thermochemical values. Thus, the linear empirical correlation between $Delta H_{rm ads}$ and $Delta H^circ _{rm subl}$ for metal-oxychlorides was updated with the inclusion of the present data. According to the predicted $Delta H^circ _{rm subl}$ (DbOCl), a $Delta H_{rm ads}$ (DbOCl) value of 135 2 kJ/mol was extrapolated. The future accomplishment of comparative studies with DbOCl under the same experimental conditions will provide valuable information on the volatility trend in Group-5 elements, together with an indication on the magnitude of relativistic effects on the electronic structure of dubnium.

Journal Articles

A Structural study on uranyl (VI) nitrate complexes with cyclic amides; -butyl-2-pyrrolidone, -cyclohexylmethyl-2-pyrrolidone, and 1,3-dimethyl-2-imidazolidone

Koshino, Nobuyoshi*; Harada, Masayuki*; Nogami, Masanobu*; Morita, Yasuji; Kikuchi, Toshiaki*; Ikeda, Yasuhisa*

Inorganica Chimica Acta, 358(6), p.1857 - 1864, 2005/03

https://doi.org/10.1016/j.ica.2004.12.036

Times Cited Count：54 Percentile：87.98(Chemistry, Inorganic & Nuclear)

Structural analyses of UO $_{2}$ (NO $_{3}$ ) $_{2}$ L $_{2}$ [L=-butyl-2-pyrrolidone, N-cyclohexylmethyl-2-pyrrolidone, and 1,3-dimethyl-2-imidazolidone] have been carried out using X-ray diffraction method. These uranyl complexes were found to have a hexagonal bipyramidal structure. The bond distances of U=O and U-O (ligand), and bond angles of U-O-C(carbonyl) are determined. In uranyl nitrate complexes with cyclic amides such as 2-pyrrolidone, urea, and caprolactam derivatives, a linear correlation was found to hold between U-O (ligand) bond distances and U-O-C(carbonyl) bond angles. Vibrational frequencies of UO $_{2}$ (NO $_{3}$ ) $_{2}$ L $_{2}$ have also been measured by IR and Raman spectrophotometers. Using relationships between vibrational frequencies of O=U=O bonds and donor numbers (DNs) of ligands, donicities of N-substituted-2-pyrrolidones were determined.