It is expected that coordination of Zr4+ would result in formation of enantiomers and other isomers in the case of either a six, seven or eight coordinate environment.
The local coordinate environment of Pt exhibits an expected trend with increasing nCo/Pt ratio: the NPt Co increases and the NPt Pt decreases, with consequent drop of JPt.
Each Pb II) ion has a hexa coordinated environment with two nitrogen from a chelating 4-BPY molecule with a Pb-N bond distances (2.593 2) Å and 2.626 2) Å) and four oxygen atoms from two bidentate 5-CTPC molecules with the Pb-O bond lengths ranging from (2.3469(19) Å to 3.019(2) Å).
A comparison of the coordinating environment of Pa5106 with that of Tm0936 from Thermotoga maritima is presented in Figure 2B (PDB id: 2PLM).
The two complexes have similar centrosymmetric dimeric structures in which each molybdenum atom occupies distorted octahedral six-coordinate environments being bonded to a dianionic tridentate ONS donor ligand via phenolate oxygen, imine nitrogen and thioenolate structure as well as two terminal oxygen atoms and a nitrogen atom of the bridging 4,4′-azpy ligand.
They found spectral signatures for both metallic Au0 and cationic Au+ species, with the cationic species apparently existing in both two and four-coordinate environments.
In our previous study [43], the MAS NMR spectroscopy on the calcined catalysts (doped and undoped), indicated that vanadium exists as tetrahedrally coordinated V5+ species in coordination environments similar to that of orthovanadate.
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In both cases, this change can be attributed to the extra interaction provided by the tridentate ligand PMDETA, which provides the Na/K atom with a four coordinate (N×4) environment without the need to engage a second TMP bridge.
