Bridging cyano ligand

Cr CNNi(tetren) 6](C104)9 is a red-purple solid, soluble in water-acetonitrile mixtures where the undissociated heptanuclear entity can be identified by electrospray ionization mass spectrometry. IR spectroscopy shows the presence of a unique /cn band at 2146 cm of the bridging cyano ligand and an intense band of the perchlorate anion at cr = 1090 cm The IR spectrum of the C-enriched compound prepared from K3[Cr( CN)6] displays a /cn band at 2103 cm The compound crystallizes in a trigonal system, space group R3, with parameters a = b = 15.274 A and c = 41.549 A. The magnetic properties indicate a ferro-... 

M" ) and the protonation equilibrium (97) exists. The latter is not unrealistic considering the results of nitrite oxidation (vide supra). It was also suggested, by way of lack of any direct evidence, that the inner-sphere oxidative behavior of IO4 should also be applicable for [MoiCNlg] ", in which a bridged cyano ligand could interact through substitution with the inner coordination sphere of a labile I(VII). 

Dinuclear Fe"-Cr" complexes with a bridging cyano ligand have been prepared and characterized by i.r. and electronic spectral studies. The complexes isolated were [(CN)5Fe-CN-Cr(H20XNH3)J and [(CN)sFe-CN-Cr(NH3)5]H20. 

Disorder is a random variation in the detailed contents of the asymmetric unit, such that not all units are truly equivalent for some atoms or groups of atoms, there are alternative positions, with no regular pattern in their adoption such a regular pattern would lead to a larger true repeat in the structure, and the observation of a superstructure. X-ray diffraction sees the average asymmetric unit when the variation is random, and this manifests itself in the structural model as partially occupied atom sites. Examples include the disorder of bridging cyano ligands over... 

Back, S., and Lang, H. (2000). Heterometallic Assemblies with Bridging Cyano Ligands. Organometallics, 19, 749-751. 

DFT calculations have also been applied to the active site of the Fe-only hydrogenase [32]. In the mechanism shown in Figure 7 the stereochemical flexibility of the terminal cyano- and bridging cysteinate ligands aids the reaction. 

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