کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1407509 | 1501690 | 2017 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structure, phase transition and conductivity study of two new organic - inorganic hybrids: [(CH2)7(NH3)2]X2, XÂ =Â Cl/Br
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Crystal structure, phase transition and conductivity study of two new organic - inorganic hybrids: [(CH2)7(NH3)2]X2, XÂ =Â Cl/Br Crystal structure, phase transition and conductivity study of two new organic - inorganic hybrids: [(CH2)7(NH3)2]X2, XÂ =Â Cl/Br](/preview/png/1407509.png)
چکیده انگلیسی
Two hybrids 1,7-heptanediammonium di-halide, [(C7H20N2]X2,X = Cl/Br crystallize in monoclinic P21/c, Z = 4. [(C7H20N2]Cl2: a = 4.7838 (2) Ã
, b = 16.9879 (8) Ã
, c = 13.9476 (8) Ã
, β = 97.773 (2)°, V = 1203.58(10) Ã
3, D = 1.137 g/cm3, λ = 0.71073 Ã
, R = 0.052 for 1055 reflections with I > 2Ï(I), T = 298(2) K. [(C7H20N2]Br2: a = 4.7952 (10) Ã
, b = 16.9740 (5) Ã
, c = 13.9281 (5) Ã
, β = 97.793 (2)°, V = 1203.83(6) Ã
3, D = 1.612 g/cm3, λ = 0.71073 Ã
, R = 0.03 for 1959 reflections with I > 2Ï(I) T = 298(2) K. Asymmetric unit cell of [(C7H20N2]X2,X = Cl/Br, each consist of one heptane-1,7-diammonium cation and two halide anions. The organic hydrocarbon layers pack in a stacked herring-bone manner, hydrogen bonded to the halide ions. Lattice potential energy is 1568.59 kJ/mol and 1560.78 kJ/mol, and cation molar volumes are 0.295 nm3 and 0.300 nm3 for chloride and bromide respectively. DTA confirmed chain melting transitions for both hybrids below T â¼Â 340 K. Dielectric and ac conductivity measurements (290 < T K < 410; 0.080 < f kHz<100) indicated higher conductivity and activation energy of bromide for T > 340 K. Cross over from Jonscher's universal dielectric response at low temperatures T < 340 K to super-linear power law for T > 340 K is observed. At high temperatures halide ion hopping in accordance with the jump relaxation model prevails.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1127, 5 January 2017, Pages 59-73
Journal: Journal of Molecular Structure - Volume 1127, 5 January 2017, Pages 59-73
نویسندگان
Mohga Farid Mostafa, Shimaa Said El-khiyami, Seham Kamal Abd-Elal,