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成田 弘一*; Nicolson, R. M.*; 元川 竜平; 伊藤 文之*; 森作 員子*; 後藤 みどり*; 田中 幹也*; Heller, W. T.*; 塩飽 秀啓; 矢板 毅; et al.
Inorganic Chemistry, 58(13), p.8720 - 8734, 2019/07
被引用回数:14 パーセンタイル:69.69(Chemistry, Inorganic & Nuclear)Current industrial practices to extract rhodium from virgin ores carry a heavy environmental burden. Improving the efficiency of the hydrometallurgical processes to separate and recover rhodium from other precious metals provides an opportunity to improve the materials and energy balances, but the presence of mixed chloride-rhodium species following leaching by acid chloride media complicates the recovery process. In this work we have applied a broad range of analytical techniques (FT-IR spectroscopy, X-ray diffraction, EXAFS, water-transfer analysis, small-angle neutron scattering, NMR spectroscopy, and electrospray mass spectrometry), which together show that the amino-amide reagent preferentially transports chlorido-rhodium species as a 1:2 neutral assembly from aqueous 2.0 M HCl phase into an organic phase. The extractants then ligate in the outer coordination shell of the chloride-rhodium anion, making this an efficient separation process. In this study, we found that protonation to the extractants induced to form a proton chelate ring, which pre-organises the ligand to present an array of charge diffuse C-H bonds. This templated arrangement of positive dipoles favors complexation to the charge diffuse chloride-rhodium anion over the more charge-dense chloride anion.
Gordon, E. B.*; 熊田 高之; 石黒 正純; 荒殿 保幸
Journal of Experimental and Theoretical Physics, 99(4), p.776 - 783, 2004/10
固体ヘリウム中への重水素分子のドープ法の開発と、1.3K, 3Mpaの固体ヘリウム中にドープされた重水素クラスターのCARS(Coherent anti-Stokes Raman spectroscopy)法による分光研究を行った。ドープされた重水素のオルト,パラ体の含有量,クラスターサイズを関数としてスペクトルの、強度,線幅,シフト等を検討し、オルト,パラ体のラマン散乱断面積の比が、気相とは10000倍異なることなどを明らかにした。