Novel Ni‐Clusters with Se and PR₃ (RPh, Et) as Ligands

Abstract

The azulene molecule is coordinated via the fulvene system formally contained in it to the [(benzene)Mo] fragment. Similarly as in $-coordinated mononuclear fulvene complexes,[41 the "exocyclic" double bond is markedly bent ( 3 3 " ) with respect to the five-membered ring. The bonds in the azulene ligand have very different lengths; they approximate to a system of alternating double and single bonds. In non-coordinated a~u l e n e [~' and in the q5-bonded mononuclear [(azulene)Cr(CO),] complexes,"' on the other hand, no bond length alternance occurs. Other than in the case of 1, the azulene ligand is planar in such complexes.Metal-ligand fragments of the type M(CO)3 (M = Cr, Mo, W) can add to 1 with formation of dinuclear complexes 2. Surprisingly, the azulene in them is q6 :q4 coordinated -a hitherto unknown form of coordination for azulene. ExperimentalAll operations were carried out under N2.

Dimerization of Endohedral Fullerene in a Superatomic Crystal

“…The other two surface Ni atoms are bonded to four Te in a distorted tetrahedral geometry. A nickel selenide cluster with an analogous core composition, Ni 12 Se 12 (PEt 3 ) 6 , was previously reported by Fenske and Ohmer but the trioctahedral core of this compound is entirely different from the distorted structure of Ni 12 Te 12 (PEt 3 ) 8 reported here.…”

Electron Counts for Face-Bridged Octahedral Transition Metal Clusters

“…Nickel can even bind ligands in a d 10 configuration, for example, in [Ni(CO) 4 ], which has a tetrahedral arrangement of ligands that leads to much smaller metal–ligand interactions than in the “octahedral” fivefold coordination considered above. In the known compound [Ni 6 Se 5 (PR 3 ) 6 ]43 Ni indeed has an approximately tetrahedral coordination environment. The metal atoms form a trigonal prism in which all faces are capped by Se, and PR 3 is attached to Ni.…”

Intermolecular Se···I Interactions Identified in Cu11(μ9‐Se)(μ3‐I)3[Se2P(OEt)2]6 Form a One Dimensional Polymeric Chain

“…12 The Cu-m 3 I-Cu angles are in the range 61.59 and 73.84°. Overall, due to the existence of three alternating triply bridging iodides, the idealized D 3h symmetry of the Cu 11 Se unit is lowered to C 3h . Hence, all the dsep ligands are related to each other by the virtual 3/m symmetry.…”