Tetrahedral structure distorted

Anhydrous IrCl3 reacts with excess mesityllithium to form air-stable tetramesityliridium, which has a distorted tetrahedral structure as expected... 

In a normal tetrahedral structure every atom has 4 near neighbours at the vertices of a surrounding tetrahedron. The shape of such a tetrahedron will determine regular and distorted tetrahedral structures. 

Semiempirical [PM3(tm)] calculations indicated that Cu complex A adopts a distorted tetrahedral structure with the positioning of the Grignard reagent at the bottom face of the complex (Figure 8). 

Bis(salicylaldoximato)nickel(II) is diamagnetic in the solid state, but becomes partially paramagnetic in solution in chloroform157 and aqueous dioxane.151 This is likely to be due to molecular association or solvation,158 rather than to the adoption of a distorted tetrahedral structure in solution.151 The nickel(II) complex readily forms pseudo-octahedral bis-adducts in the presence of large amounts of amines,159 160 although analogous complexes of commercial orffto-hydroxy-oximes have been reported to retain the square-planar structure in hydrocarbon solution in the presence of moderate amounts of ammonia or aliphatic amines.161... 

Superacidic protonation of MePF2 was also used to prepare the salts MePF2H+MF6 (M = As, Sb).556 The cations show distorted tetrahedral structure and weak P—F interionic contacts. 

Two vanadium(iv) ethylxanthate complexes have been prepared 440 their e.p.r. parameters are practically identical with those of the corresponding diethyldithio-carbamate complexes and on this basis analogous structures were proposed, i.e. a dodecahedral eight-co-ordinate structure with four bidentate ethylxanthate ligands and a distorted tetrahedral structure with four unidentate ligands. Addition of phosphorus(iii) ligands (L) such as trialkylphosphites to solution of the ethyl xanthate... 

The crystal structure of nitrite reductase (NiR) from Achromobacter cycloclastes was recently reported by Godden et al. (46). The protein contains both a type I and a type II copper site. The type I center has a distorted tetrahedral structure typical of type I copper, whereas the... 

Co(NO) N(dppe)3 ](BPh4) has the CoNO 9 configuration and has a slightly distorted tetrahedral structure (Table 12) not unlike that found in high-spin [CoCl N(dppe)3 ](PF6) (Table 40). The one unpaired electron (p. = 1.98 BM) lies predominantly in a metal-based orbital,108 which is consistent with the considerable bending in the CoNO grouping (165°). 

An example of a substituted hydrazine (1-) complex is Ge[N(Me)NMe2]4 which has a distorted tetrahedral structure complexes of other main group elements (as well as transition metal complexes) are known.179 An example of a NHNH2 species is Cp Me4W(T72-NHNH2).180... 

Distorted tetrahedral species occur and [Cu(C6HnNH2)4](N03)2, for example, is intermediate between tetrahedral and square. Distorted tetrahedral structures with imidazole, cysteine, methionine, and similar ligands have been greatly studied as models for Cu11 in azurin and plastacyanin. 

The pyridine adduct of the cyclopentadienyl derivative, Cp2Cd(NCsH5)2, also exhibits a distorted tetrahedral structure (6) in which both cyclopentadienyl ligands are coordinated in monohapto fashion [c((Cd ) = 2.353(5), 2.307(5)A, i(Cd-N) = 2.309(3), 2.360(3) A C-CdA7 = 129.1(2)°]. The pentamethylcyclopentadienyl complex Cp 2Cd also forms a yellow adduct with glyme, Cp 2Cd(glyme). The... 

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