Sexidentate ligand

If a sexidentate ligand were to coordinate to Mm+, fin would just be fii = Ad, with units L mol-1. Consequently, we cannot compare fix for formation of a sexidentate ligand with the overall stability constant fie for six comparable unidentate ligands because the units are incompatible. 

The most widely studied of the higher oxidation-state complexes incorporating oxime groups are those involving derivatives of the sexidentate ligand (45, 46) 3,14-dimethyl-4,7,10,13-tetraazahexadeca-... 

Wrapping the sexidentate ligand around the metal (Fig. 2) creates a pair of optical isomers and the nickel(IV) complexes are sufficiently inert to allow optical resolution (54, 55). UVvisible and circular dichroism spectra are shown in Fig. 3. Further evidence of the inert-... 

The recently synthesized sexidentate ligand 6 seems to fulfill the prerequisites for hosting the reversible translocation of a transition metal ion under a pH gradient [19]. Compartments A and B are clearly defined compartment A (in its protonated form AH2) contains two amine nitrogen atoms and two amide groups. In view of the very poor coordinating tendencies of the amide... 

The ligands (208) form copper(ii) complexes which are probably trimeric, and the potentially sexidentate ligand (91) forms a copper(ii) complex which is probably four-co-ordinate. ... 

The complex cation in [Fe FB(ONCH-CsH3N)3P IBFJ,CHjClj contains a rigid, sexidentate ligand, designed specially to force a trigonal-prismatic co-ordination geometry on first-row transition metals. It does it successfully with the nickel(ii) ion, and probably also in the isomorphous zinc(ii) and cobalt(ii) derivatives, but in the case of the iron(ii) cation... 

Miscellaneous Complexes of Nickel(n) and Nickel(IV).—A preliminary report has appeared on the structure of the perchlorate salt of the complex cation which contains the sexidentate ligand (39). The geometry around the... 

Miscellaneous.—Racemization of the iron(n) complex of the sexidentate ligand (30) has an activation enthalpy of 18.4 kcal mol and an activation entropy of +1 cal deg" mol". The geometry of the ligand permits racemization via a trigonal twist, but precludes racemization via a rhombic... 

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