Sarcophaginates conformation

The ethylenediaminate fragments of the sarcophaginate frameworks exhibit certain flexibility, which enables them to have conformations from the X (the A-Csleh form) to 8 (the A-Dsobs form). Conformations "lei" and ob" define the parallel and oblique orientation of the C-C bond of the ethylenediaminate moiety relative to the Cs axis, respectively. The existence of intermediate forms as energetically stable conformations is also possible [107]. Theoretical interpretation of the electron transfer and electrochemical and... 

Stepwise methylation of apical amino substituents in cobalt(III) sarcophaginate make it possible to obtained a tris-N-methylated complex with conformational inversions in the ethylenediamine moieties from mainly a ZeZ -conformation in [Co(diAMsar)] + cation to an 063 conformation in [Co(diMe3AMHsar)]3+ sarcophaginate both in the solid state and in solution [116]. 

The expanded Se-sarcophaginate diMEl,3pnsar-S6 ligand displaying high conformational lability and, therefore, apt to be readily demetallate, was synthesized by Scheme 66 [147]. 

The metal-donor atom distance and conformation for cobalt(II,III) and platinum(IV) sepulchrates and sarcophaginates. 

For cobalt(III) compounds, P. Comba calculated five of the six conformations possible for sarcophaginate complexes (Fig. 3), using strain energy minimization [230]. The sixth Dsleh conformation does not exist in cobalt(III) cages. Some structural parameters of the strain energy-minimized structures of the cobalt (III) complex conformers are presented in Table 4. 

In the case of amidine- and amide-functionalized cobalt(II) Ne- and NsSs-sarcophaginates, two of the three five-membered chelate cycles display the lei conformation, while the third one, which is on the same strand as the amide or amidine group, has the ob conformation... 

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