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Table 1 Logarithms of overall formation constants in the CoII(Himid)(L-α-Amac)nH2O system and UV–Vis parameters

From: Equilibria in cobalt(II)–amino acid–imidazole system under oxygen-free conditions: effect of side groups on mixed-ligand systems with selected L-α-amino acids

System m l l′ h Refinement results (log10 β mll′h ) σ b λ max (ε) nm (L mol−1 cm−1)
Co(H2O) 6 2+ a 1 0 0 −1 −8.45(3)   512 (5)
Imidazolea 0 0 1 1 7.28(1) 2.89  
1 0 1 0 2.82(2) 1.49 514 (6)
1 0 2 0 4.94(2)   506 (16)
1 0 3 0 6.76(9)   491 (38)
1 0 4 0 8.29(13)   
1 0 5 0 9.68(14)   
Alaninea 0 1 0 1 9.75(1) 4.59  
0 1 0 2 12.13(1)   
1 1 0 0 4.20(1) 5.70 508 (8)
1 2 0 0 7.65(1)   491 (11)
1 3 0 0 9.92(1)   500 (19)
1 1 1 0 6.97(2) 1.32 505 (15)
1 2 1 0 9.94(4)   495 (20)
Asparagine 0 1 0 1 8.66(1) 5.99  
  0 1 0 2 10.96 (1)   
  1 1 0 0 4.25(1) 3.47 507 (8)
  1 2 0 0 7.67(1)   485 (10)
  1 3 0 0 9.23(1)   500 (17)
  1 1 1 0 6.89(1) 2.17 503 (20)
  1 2 1 0 9.70(1)   491 (22)
  1. Temp. 25.0 ± 0.1 °C, I = 0.5 mol L−1 (KNO3). Programs: Hyperquad 2008 and HypSpec. Standard deviations at the last decimal points—in parentheses. β mll’h  = [M m L l L′ l′ H h ]/[M]m[L]l[L′]l′[H]h, where M = Co(II), L = AmacH-1, L′ = Himid, H = proton
  2. a Results for Co(H2O) 6 2+ , Ala and Imidazole taken from previous paper [8]
  3. b σ statistical residual parameter of Hyperquad [27]