Bismuth(III) complexing with some N- and N,N-substituted thioureas

Formation of bismuth(III) N-methylthiourea complexes in aqueous solutions

“…From Fig. 3, it follows that, as for the formation of bismuth thiourea complexes [4], the forma tion function of the studied system has a rather steep shape, as observed in the case of K n + 1 ≥ K n . The for mation function curve may be divided into two seg ments: (1) with a relatively smooth change up to n < 4 and (2) with a sharp ascent at n > 4.…”

“…Even without consideration for the protonation of mtu, its complexes with bismuth(III) have proven to be more stable than those with thiourea [4]. This may be associated with a lower mtu hydration energy owing to the additional hydrophobic substituent ( -CH 3 ).…”

“…An unusual ratio of the stepwise stability constants (K n ) like K n + 1 ≥ K n was found for bismuth(III) thiourea complexes in aqueous solution [4]. The study of step wise complexation regularities of bismuth(III) with N substituted thioureas and other thioamides is important for establishing the boundaries of the observed specific behavior of these ligands and for discussing its possible causes and predictability.…”

Crystal structure of [Bi(N-ethylthiourea)4(ClO4)2]ClO4

“…The Cl1-O distances in the inner-sphere Crystallographic data, details of data collection, and characteristics of data refinement of the structure of I [18] and N-methylthiourea (Mtu) [19], an unusual ratio of stepwise stability constants (K n ) was found: K n + 1 ≥ K n . [21].…”

Effect of Temperature on the Stability of Re(V) Complexes with N-Ethylthiourea

“…Spectrophotometry was used in [1] to determine stability constants for Bi(III) monocoordinated complexes of the (BiL 3+ ) type with thiourea (Tu), N-phenylthiourea (Ptu), N-phenyl-N'-propylthiourea (Pptu), N,N'-diphenylthiourea (Вptu), N-allyl-N'-propylthiourea (Аptu), along with the protonation constants for these ligands in perchloric acid solutions at a sodium perchlorate (Na(H)ClO 4 ) ionic strength of 2 mol/L and 293 K. The stability of (BiL 3+ ) complexes was found to change in the ligand order Аptu > Tu > Pptu > Ptu > Вptu, which coincides with the order of change in their protonation. The protonation constants for Вptu, Ptu, and Pptu were less than those of Tu, due to the strong electronegative properties of the phenyl group.…”