Sublimation behavior of tris(2,2,6,6-tetramethyl-3,5-heptanedionato)lanthanoid(III).
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- Amano Ryohei
- School of Paramedicine, Kanazawa University
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- Sato Akiko
- The Research Institute for Iron, Steel and Other Metals, Tohoku University
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- Suzuki Shin
- The Research Institute for Iron, Steel and Other Metals, Tohoku University
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説明
Two fundamental experiments (to determine vapor pressures and vacuum sublimation-recrystallizing temperature zones) were undertaken on a series of remarkably volatile and thermally stable lanthanoid(III) chelates of 2,2,6,6-tetramethyl-3,5-heptanedione (Ln(thd)3) in order to obtain information about their sublimation behavior. Vapor pressures of these chelates were measured from 100 to 150 °C by means of a modified Knudsen effusion technique. Vacuum sublimation-recrystallizing temperatures were determined by using a sublimation apparatus with a continuous temperature gradient along its sublimation tube. The obtained enthalpies of sublimation were classified into three groups (La to Gd, Tb and Dy, and Ho to Lu), and the vacuum sublimation-recrystallizing temperature zones were divided into two sets (La to Tb, and Dy to Lu). The Tb and Dy chelates were also found to change thermally from a dimeric form to a monomeric form at a definite temperature. These results are explained in terms of the two different crystallizing forms of Ln(thd)3 chelates. Furthermore, the regularity in their sublimation behavior is discussed as a function of the atomic numbers of the lanthanoid metals, using thermochemical considerations.
収録刊行物
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 54 (5), 1368-1374, 1981
公益社団法人 日本化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679102496256
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- NII論文ID
- 130001987049
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- ISSN
- 13480634
- 00092673
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
