کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1235097 | 968842 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Inclusion properties of 3-fluoromesotetraphenylporphyrin with C60 and C70 Inclusion properties of 3-fluoromesotetraphenylporphyrin with C60 and C70](/preview/png/1235097.png)
To improve the selectivity ratio of C70 over C60, a new designer molecule, viz., 3-fluoromesotetraphenylporphyrin (1) has been reported in the present investigations. Fluoresence studies reveal that the Q-absorption band of 1 gets sufficient quenching effect upon addition of both C60 and C70. Binding constants (K) of the C60/1 and C70/1 complexes are estimated to be 580 and 10,800 dm3 mol−1, respectively. Thus, KC70/KC60KC70/KC60 is ∼19 which is very large and even comparable with other macrocyclic host molecules like calix[5]arene, azacalix[m]arene[n]pyridine, cyclotriveratrylenophane and calixarene bisporphyrin. 1H NMR chemical shift measurements show that the –NH– proton of 1 suffers more shifts in presence of C70 compared to C60. This finding also offers a good support in favor of high K value for C70/1 complex as well as large selectivity ratio of C70 over C60.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 67, Issue 5, August 2007, Pages 1257–1262