Bridging ligands hydrogen

Figure 3 shows a proposed catalytic mechanism for [NiFe]-hydrogenases. For hydrogen oxidation, the catalytic cycle starts at the Ni-SU state, a Ni(II) state with no bridging ligand. Hydrogen binds the active site and is heteroly tic ally cleaved to produce the Ni-R state, a Ni(II) species with a bridging hydride and likely a... 

Polynuclear complexes with aminoalcohols and iminoalcohols as ligands O-bridged and hydrogen bonded species. J. A. Bertrand and P. G. Eller, Prog. Inorg. Chem., 1976, 21, 29-53 (54). 

Ardon M, Bino A (1987) A New Aspect of Hydrolysis of Metal Ions The Hydrogen-Oxide Bridging Ligand (H3O-2). 65 1-28 Arendsen AF, see Hagen WR (1998) 90 161-192... 

Fig. 2. Stereo view of the active site off), gigas hydrogenase (reprinted with permission from (65) copyright 1997, American Chemical Society). LI and L2 are diatomic ligands that form hydrogen bonds with the protein- they are supposed to be the two CN s molecules. The third ligand L3 sits in a hydrophobic pocket and is assumed to be the CO. The designates the putative oxo bridging ligand.

The relatively low cooperativity of this ID system has been attributed to the flexibility of the btzp bridging ligand, which may act as a shock absorber against the elastic interactions between active SCO sites, as well as to the absence of a hydrogen bonding network. This compound undergoes the... 

Bertrand, J. A. and Eller, P. G., Polynuclear Complexes with Aminoalcohols and Iminoalcohols as Ligands Oxygen-Bridged and Hydrogen-Bonded Species 21 29... 

Adsorption of nonionic compounds on subsurface solid phases is subject to a series of mechanisms such as protonation, water bridging, cation bridging, ligand exchange, hydrogen bonding, and van der Waals interactions. Hasset and Banwart (1989) consider that the sorption of nonpolar organics by soils is due to enthalpy-related and entropy-related adsorption forces. 

The phen derivatives (319) and (320) contain intramolecular hydrogen bonds, and have been incorporated into the complexes [Ru(319)(bpy)2] " and [Ru(320)(bpy)2r. Spectroscopic methods and viscosity data have been used to investigate the interactions between these species and calf thymus DNA. It is proposed that binding of [Ru(319)(bpy)2] involves the intercalation of ligand (319) between the base pairs of DNA partial intercalation is proposed for [Ru(320)(bpy)2] . " The length of the spacer in the bridging ligand (321) in [(phen)2Ru(//-321)... 

---