Lantern-type complexes

Lantern structure, in bridging triazenide transition metal complexes, 30 10, 32 Lantern-type complexes, see Dinuclear complexes, quadruply bridged Lanthanides, see also Metals, ions specific elements... 

Quadruply bridged dinuclear complexes (so-called lantern-type complexes) (Fig. 1) are known for a wide variety of transition metal ions such as Cu, Cr, Mo, W, Tc, Re, Ru, Os, Rh, Ir, Ni, Pd, and Pt, and they appear to be one of the most important common basic structures of transition metal complexes (2-3). Most bridging ligands form five-membered rings on bridging between two metal ions. Platinum corn-... 

The acetate ion is the most common bridging ligand to form lantern-type complexes, and tetraacetate complexes have been known for some time for all the metal ions that afford this structure except the group... 

These A-frame pyrazolyl-bridged binuclear iridium(I) complexes, like the face-to-face lantern type complexes of the Pt2(pop) type, have dipole-allowed... 

Carboxylate Complexes with the Lantern -Type Structure... 

The electronic structure of carboxylate complexes with the lantern -type structure was studied [58] using EHT calculations (Fig. 10, Table 5). 

POP- and PCP-Bridging Ligands. The pyrophosphite complexes are the most studied among lantern-type diplatinum complexes [6] [8] [73]. The Ptn complex [Pt2(H2P205 />,/>)4]4- is easily prepared by reaction of K2PtCl4... 

The X-ray crystal structures of the acetato, propionato and n-butyrato complexes show these to have the lantern type of structure (Table 26 and Figure 34). 

Structural characterization of the lantern-type dipalladium(II) (9) and dinickel(II) (10) complexes appeared shortly before the report of K2[Pt2(S04)4(H20)2]. Their chemistry did not develop as much as that of the platinum complexes, however. This is probably because of the limitation of the bridging ligands to give the lantern-type Pd and Ni complexes and also of a lesser trend of these metal ions to give stable complexes with higher oxidation states. 

Raman and Resonance Raman Bands (cm ) for the Lantern-Type Diplatinum Complexes... 

H, C, P, and Pt NMR spectra are available in the literature for various lantern-type diplatinum complexes. H, C, and P NMR spectra have been used mainly for structural assignments and are not useful for comparison among various lantern-type compounds with different bridging ligands. 

A theoretical evaluation of ligands that would stabilize a vanadium-vanadium triple bond was undertaken and concluded that O- and N-donors in amidates would yield the greatest stability.890 A lantern-type metal-metal bonded dinuclear V11 complex was synthesized by the reduction of [VCl3(thf)3] with NaHBEt3 followed by addition of the lithium salt of V,V -di-p-tolylformamidate (215). 65 The crystal structure shows the V V distance to be 1.98 A, which is consistent with a fairly strong metal-metal triple bond.865... 

Reactions of alkynes with a triangular triplatinum(O) complex and with its lantern-type dimer yield dinuclear Pt(i) complexes with a dimetallavinylene ligand 2 and 3 (Equations (2) and (3)). Existence of a Pt(i)-Pt(i) bond is evidenced by X-ray and NMR data. This structure is more reasonable than another possible one having two Pt(0) centers and a bridging alkyne ligand. 

A lantern-type dinuclear Pt(ii) complex with bridging 6 ,Ai -coordinated triphenylarsine ligands 885 undergoes oxidation with PhlGle or GH2CI2 to afford the Pt -Pd complex with chloro ligands (886, Equation (164)). ... 

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