Microcalorimetric study on host-guest complexation of naphtho-15-crown-5 with four ions of alkaline earth metal.
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.
Song
Ming-zhi
MZ
Department of Chemistry, Liaocheng University, Liaocheng 252059, China.
Zhu
Lan-ying
LY
Gao
Xi-ke
XK
Dou
Jian-min
JM
Sun
De-zhi
DZ
D002151:Calorimetry / Q000379:methods*; D043844:Crown Ethers / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D046911:Macromolecular Substances / Q000032:analysis / Q000737:chemistry; D008673:Metals, Alkaline Earth / Q000737:chemistry*; D008832:Microchemistry / Q000379:methods*
D043844:Crown Ethers; D007477:Ions; D046911:Macromolecular Substances; D008673:Metals, Alkaline Earth