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硝酸锌与四种α-氨基酸配合物的恒容燃烧能测定(英文)

Determination of Constant-Volume Combustion Energy for the Complexes of Zinc Nitrate with Four Amino Acids
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摘要 Ten solid complexes of zinc nitrate w ith L-α-leucine(Leu),L-α-valine(Val),L-α-tryptophan(Try)and L-α-threonine(Thr )were prepared in water.The compositions of these complexes are determin ed by chemical analysis and elemental analysis,which are identified as Zn(Leu)(NO 3 ) 2 ·2H 2 O(A),Zn(Leu) 2 (NO 3 ) 2 ·H 2 O(B),Zn(Val)(NO 3 ) 2 ·2H 2 O(C),Zn(Val) 2 (NO 3 ) 2 ·H 2 O(D),Zn(Val) 3 (NO 3 ) 2 ·H 2 O(E),Zn(Try)(NO 3 ) 2 ·2H 2 O(F),Zn(Try) 2 (NO 3 ) 2 ·H 2 O(G),Zn(Thr )(NO 3 ) 2 ·2H 2 O(H),Zn(Thr ) 2 (NO 3 ) 2 ·H 2 O(I)and Zn(Thr ) 3 (NO 3 )·H 2 O(J).The constant-volume combustion en ergies of the complexes,Δ c U(complex),were determined by a precise rotating bomb calorimeter a t 298.15K.Standard enthalpies of combustion,Δ c H m (complex,s,298.15K),and standard enthalpies of formatio n,Δ f H m (complex,s,298.15K)for these complexes were calculated as(4523.22±2.08),(7208.86±4.28),(3442.21±1.85),(5971.21±3.32),(9007.26±4.24),(5802.35±2.14),(10891.58±3.01),(2147.40±1.28),(4120.83±0.99),(6444.68±3.85)kJ·mol -1 and(615.67±2.27),(1863.16±4.60),(1017.34±2.00),(1742.93±3.61),(2245.70±4.73),(1161.18±2.61),(1829.71±4.20),(1632.82±1.43),(1885.55±1.50),(2770.25±4.21)kJ·mol -1 ,respectively. Ten solid complexes of zinc nitrate with L-alpha-leucine(Leu), L-alpha-valine(Val), L-alpha-tryptophan(Try) and L-alpha-threonine(Thr) were prepared in water. The compositions of these complexes are determined by chemical analysis and elemental analysis, which are identified as Zn (Leu) (NO3)(2) . 2H(2)O (A), Zn (Leu)(2)(NO3)(2) . H2O (B), Zn (Val) (NO3)(2) . 2H(2)O (C), Zn (Val)(2)(NO3)(2) . H2O(D), Zn(Val)(3) (NO3)(2) . H2O(E), Zn (Try) (NO3)(2) . 2H(2)O (F), Zn (Try)(2) (NO3)(2) . H2O (G), Zn (Thr) (NO3)(2). 2H(2)O(H), Zn(Thr)(2)(NO3)(2) . H2O (I) and Zn (Thr)(3)(NO3) . H2O(J). The constant-volume combustion energies of the complexes, Delta(c)U(complex), were determined by a precise rotating bomb calorimeter at 298.15K. Standard enthalpies of combustion, Delta(c)H(m)(circle minus) (complex, s, 298.15K), and standard enthalpies of formation, Delta(f)H(m)(circle minus) (complex, s, 298. 15K) for these complexes were calculated as (4523.22 +/- 2.08), (7208.86 +/- 4.28), (3442.21 +/- 1.85), (5971.21 +/- 3.32), (9007.26 +/- 4.24), (5802. 35 +/- 2. 14), (10891. 58 +/- 3. 01), (2147. 40 +/- 1. 28), (4120. 83 +/- 0. 99), (6444. 68 +/- 3. 85) kJ (.) mol (-1) and (615. 67 +/- 2. 27), (1863. 16 +/- 4. 60), (1017. 34 +/- 2. 00), (1742.93 +/- 3.61), (2245.70 +/- 4.73), (1161. 18 +/- 2. 61), (1829. 71 +/- 4. 20), (1632. 82 +/- 1. 43), (1885. 55 +/- 1. 50), (2770. 25 +/- 4. 21) kJ (.) mol (-1), respectively.
机构地区 西北大学化学系
出处 《无机化学学报》 SCIE CAS CSCD 北大核心 2003年第3期278-282,共5页 Chinese Journal of Inorganic Chemistry
基金 国家自然科学基金资助项目(No.29871032 20171036)。
关键词 硝酸锌 Α-氨基酸 配合物 标准生成焓 zinc nitrate alpha-amino acid complex standard enthalpy of formation
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参考文献7

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