2002年5月
Thermochromism in nickel(II) complexes: thermal, solid state H-1 NMR and single crystal X-ray analysis of bis-(N,N-dimethyl-1,2-ethanediamine) nickel(II) perchlorate
JOURNAL OF MOLECULAR STRUCTURE
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- 巻
- 608
- 号
- 1
- 開始ページ
- 63
- 終了ページ
- 69
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1016/S0022-2860(01)00930-9
- 出版者・発行元
- ELSEVIER SCIENCE BV
The complex bis-(N,N-dimethyl-1,2-ethanediamine) nickel(II) perchlorate undergoes a first-order thermochromic phase transition at ca. 476 K, changing its color from orange to red. The room temperature X-ray crystal structure determination showed that the nickel ion possesses a square-planar geometry with two five membered chelate rings, in the deltalambda conformation, forming the NiN4 chromophore. The broad-line H-1 NMR indicates the onset of a dynamic disorder of diamine chelate rings at the phase transition temperature region, while T-1 measurement of 1H affords the activation energy of the puckering metal chelate rings to be 26 kJ mol(-1). The electronic spectrum revealed that a weakening of ligand field around the nickel is associated with the phase transition. (C) 2002 Elsevier Science B.V. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/S0022-2860(01)00930-9
- ISSN : 0022-2860
- eISSN : 1872-8014
- Web of Science ID : WOS:000174630200009