Lantern type structures

Binuelear Cluster Compounds 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). 

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... 

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). 

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-... 

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. 

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... 

The electronic structures of lantern-type Pt(III) dimers are discussed on the basis of a general scheme for dimers with a d -d electronic configuration, as depicted in Fig. 20. HOMO is considered either the diT or the c 8 orbital of the Pt—Pt single bond. The LUMO is usually do- orbital. In the case of the Pt(II) dimers, HOMO is now dcr orbital... 

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. 

Another widespread type of metal binding of carboxylate ligands is that in which the formation of dimers occurs having the structure of a Chinese lantern 283 [4, p.l32 537] ... 

---