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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.
L-α-valine (Val), L-α-tryptophan (Try) and L-α-threonine (Thr) were prepared in water.The compositions of zinc nitrate w ith L-α-leucine (Leu) 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 ), 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 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 at 298.15 K. Stardard 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.