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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2005, Vol. 6 Issue ( 1): 14-    DOI: 10.1631/jzus.2005.B0069
    
Microcalorimetric study on host-guest complexation of naphtho-15-crown-5 with four ions of alkaline earth metal
SONG Ming-zhi, ZHU Lan-ying, GAO Xi-ke, DOU Jian-min, SUN De-zhi
Department of Chemistry, Liaocheng University, Liaocheng 252059, China
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Abstract  Thermodynamic parameters of complexation of naphto-15-crown-5 with four alkaline earth ions in aqueous media was determined using titration microcalorimetry at 298.15 K. The stability of the complexes, thermal effect and entropy effect of the complexation is discussed on the basis of the guest ions structure and the solvent effect. The stability constants tendency to vary with ion radius was interpreted. Complex of naphtha-15-crown-5 with calcium ion is very stable due to the synergism of static electric interaction and size selectivity between the host and the guest.

Key words： Microcalorimetry      Host-guest complexation      Naphtho-15-crown-5      Alkaline earth metal      Molecular recognition     
Received: 30 March 2004     
CLC:  O642  
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SONG Ming-zhi
ZHU Lan-ying
GAO Xi-ke
DOU Jian-min
SUN De-zhi
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SONG Ming-zhi, ZHU Lan-ying, GAO Xi-ke, DOU Jian-min, SUN De-zhi. Microcalorimetric study on host-guest complexation of naphtho-15-crown-5 with four ions of alkaline earth metal. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 1): 14-.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2005.B0069     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2005/V6/I 1/14

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