1,3,5-Triamino-1,3,5-trideoxy-cis-inositol, a ligand with a remarkable versatility for metal ions. 5. Complex formation with magnesium(II), calcium(II), strontium(II), barium(II), and cadmium(II)

Chelation versus Binucleation: Metal Complex Formation with the Hexadentate all‐cis‐N1,N2‐Bis(2,4,6‐trihydroxy‐3,5‐diaminocyclohexyl)ethane‐1,2‐diamine

“…[7] These values rather correspond to log b 110 = 8.40, observed for [Zn- [24] is in accordance with the behavior of the corresponding taci complexes. [40] In general, the stability of ML e complexes can be well reproduced by linear free energy relations, such as Equations (1) 3 + /2 + (À0.36 V). [15] The potentials observed did not depend on pH, but, in acidic solutions, an irreversible reaction was observed attributed to the decay of the complexes in the divalent stage.…”

“…[7,41] (1)À(4) discussed in the text (taci = 1,3,5-triamino-1,3,5-trideoxy-cis-inositol, tmca = all-cis-2,4,6-trimethoxycyclohexane-1,3,5-triamine). The formation constants of the taci and tmca complexes are from references [13], [24], [38], and [40].…”

The Coordination Chemistry of 1,4‐Diazepan‐6‐amine

“…A purely statistical approach would require that K 1 /K 2 = 16 (log K 1 /K 2 = 1.2), [35] and thus it is evident that the two ligands in the [M(daza) 2 ] 2+ complexes show some cooperativity. As discussed previously, [14,36] the different behavior of the ligands with three exocyclic amino groups on the one hand and of cis-dapi and daza on the other can be explained by means of steric requirements, which result in different interligand interactions (Scheme 4). Moreover, some symbiotic behavior appears to further enlarge the binding of the second ligand.…”

“…The constants of the daza complexes are from this work (Table 4), the formation constants of the other ligands are from refs. [3,14,20,21,36] more pronounced for the addition of a second ligand moiety (Figure 8b), where a distinct maximum is now observed at Ni II for all the ligands. The preferred binding of Ni II is obviously due to the exclusive facial coordination mode of these ligands, which results in the above-mentioned weak binding of the third amine donor to the Cu II center.…”

Molecular mechanics calculations of ?-diketonate, aqua, and aqua-?-diketonate complexes of lanthanide ions using Gillespie-Kepert model

“…Hancock and coworkers developed the MM parameters and studied a number of Gd 3+ complexes with of O-, N-ligands. 9 Using "coordination scan," 19 the authors predicted the number of water molecules bound to the Gd, as well as an estimated thermodynamic stability. Unfortunately, the lanthanide ion diketonates, despite their practical value, are not thoroughly studied with molecular mechanics.…”