Pseudo-octahedral complexes

Co111.1279 In these reactions the Ni11 center normally retains its square planar geometry, but the reaction with [PtCl2(bipy)] results in a pseudo-octahedral complex [ (H20)2Ni(aet)2 Pt(bipy)]2+. Reaction with bipy gives [ (bipy)Ni(aet)2 Pt(bipy)]2+.1280... 

Reaction of 3-(2-pyridyl)pyrazole and 6-(3-pyrazolyl)-2,2 -bipyridine with zinc salts results in mononuclear pseudo-octahedral complexes [ZnL3](PF6)2 and [ZnL2](PF6)2 respectively. The ligands coordinate as neutral mononucleating chelates in a similar fashion to the bidentate 2,2 -bipyridine or tridentate 2,2 6, 2"-terpyridine respectively.153... 

General Structural Features. The general structure of halfsandwich ruthenium(II)-arene complexes is shown in Fig. 12. The structural, stereochemical and electronic features of metal-arene complexes have been discussed (63). A typical piano-stool geometry consists of an rj6-arene occupying three coordination sites of the pseudo-octahedral complex, leaving the three legs X, Y, and Z available for coordination. The sites X and Y can be taken up by two monodentate ligands, but are more commonly... 

NMR studies of the fluxionality of octahedral transition element dithiocarbamates were performed by Pignolet and coworkers.65 The synthesis and X-ray structure of the pseudo-octahedral complex ion (40) were described by McCleverty et al. in their investigations of the inorganic aspects of rubber vulcanization.66 Our investigations point to the existence of a barium analogue.67... 

NMR and other spectroscopic properties have been reported (53) for pseudo-tetrahedral and pseudo-octahedral complexes of type MLX2 where M = Co(ii), Ni(ii), and Cu(ii), X = halide, and L = N,N -bis(phenylaminomethyl)parabanic acid [4]. The NMR spectra of the... 

Pseudo-octahedral complexes of Ni(ii) with 1,3-diamine chelates have been shown (247) to undergo a rapid conformational interconversion [46]. In the diagram, (a) refers to the chair-chair equilibrium and (b) to the twist-twist equilibrium. The results indicate that... 

In addition to the 72 and states, the T, state lies some 500cm above in pseudo-octahedral complexes. In lower symmetry complexes both E and Tj are split, and in strong tetragonal fields, one of the Tj components is below E [32] as evidenced by the markedly broader emission spectrum [33]. There appears to be good thermalization between the Ti and E states. As a result of the thermalization, all of the photophysical rates for steps originating in E/ T, are population weighted averages of the rate constants for the individual states. If all reaction occurs in doublet states, the same conclusion applies to calculated from Eq. (21). 

The high-spin pseudo-tetrahedral complexes [Fe(S2PX2)2] (X = CF3, Me, or Ph) have been reported, as have the pseudo-octahedral complexes [FeL2X2] [X = Cl, Br, or I L = (63)].p-Thioxan (TX) forms the complex [Fe(TX)2-... 

The cyclopentadienyl ligand (Cp) is very widespread in organometal-lic chemistry. When it is coordinated in the ti mode, the most common situation, it behaves as an L2X ligand (Chapter 1, 1.1.1.3). [CpMLj] complexes (L = CO, PR3,. ..) are therefore pseudo-octahedral complexes of the ML5X type, which have 18 electrons when their electronic configuration is 4 . A 4 [CpMLj] complex may therefore be used as a new initial structure, very similar to that used previously. Since the presence of the cyclopentadienyl ligand oxidizes the metal by one unit, a metal with seven valence electrons (M = Mn, Tc, Re) must be used to obtain a neutral complex. The complex [CpMn(CO)3] is therefore a... 

The pseudo-octahedral complex (4) has been produced by aerial oxidation of 3,5-di-t-butylcatechol in the presence of ammonia and Mg ". It is also formed... 

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