Sarcophaginates contracted

An intermediate [Co(CLsar)]Cl3 monochlorosarcophaginate has also been formed. In addition to clathrochelate [Co(diCLsar)]3+ cation, nine compounds were isolated from two main fractions ("orange" and "yellow") of the nitrosation products by lEC [101]. The first one contained unreacted [Co(diNOsar)]Cl3 (3%), [Co(CLNOsar)]Cl3 (18%), [Co(HONOsar)]Cl3 (7.5%), [Co(HOCLsar)]Cl3 (26%), [Co(diHOsar)]Cl3 (1.5%) and the expected [Co(diCLsar)]Cl3 (44%) sarcophaginates. The second fraction was a mixture of complexes of a contracted absar ligand that arose from intramolecular rearrangement ... 

Thus, apart from the expected [Co(diCLsar)]Cl3 complex, the nitrosation of [Co(diAMsar)]3+ diaminosarcophaginate yielded four regular sarcophaginates and four contracted absar ligand complexes [101]. 

The capping of N3S3-semiclathrochelate [Co(ten)]3+ cation via a template-assisted mixed aldehyde (formaldehyde/propanal) condensation (Scheme 47) made it possible to obtain NsSs-sarcophaginates with both regular and contracted cavities in fairly high yield, as well as to isolate the corresponding free ligands [124]. 

A contracted sarcophaginate [Co((ClME)abcapten)]3+ cation Ev2 =-200 mV, ku = 1.3 x 10 moh s ) was examined as an ETA in photocatalytic systems for hydrogen production [356]. The rate of photoinduced hydrogen formation is controlled by the generation of the excited state S and three processes of the electron transfer ... 

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