Organometallic complexes containing

Organometallic complexes containing Group IIIB and Group IVB ligands 115a... 

Various organometallic complexes containing heterocyclic group 15 rings are known. These are often formed in complex reactions. For example, a mixture of the phosphacyclopentadienes 111 and 112 reacts slowly with distilled calcium metal to yield the tetranuclear 113 (Figure 58).301 The centra symmetric Ca2Cl2 core is nearly square, with... 

Chemical routes involving the use of tungsten salts have been reported. W2C was claimed to be formed by the pyrolysis of an organometallic complex containing cyclopentadiene and carbonyl groups.8 The W2C formed was useful for ceramic applications such as wear resistant surfaces and cutting tools. The same phase was also prepared by the reduction of WC14 with sodium triethylborohydride.9 The material was formed as 1-5 nm-sized crystallites as shown by SEM and TEM. 

Ab initio MO calculations have been carried out on benzo[. ]thiophene (BT), 2-methylbenzo[/ ]thiophene (2-MeBT), 3-methylbenzo[ ]thiophene (3-MeBT), and a number of organometallic complexes containing these thiophenic moieties in an attempt to understand the usual preference for insertion of metal fragments into the sulfur-carbon(vinyl) bond of BT and the recent observations of insertion into the sulfur-carbon(aryl) bond <19980M3798>. 

J. Powell Organometallic complexes containing three-electron ligands. 

The majority of organometallic complexes contain 18 electrons see Bonding Energetics of Organometallic Compounds). These complexes undergo ligand substitution, reductive elimination, and electron-transfer reactions see Electron Transfer in Coordination Compounds). Each type of reaction will be covered in the following sections. 

Organometallic complexes containing a single metal center usually obey the so-called 18-electron rule see Effective Atomic Number Rule), whereas the bonding in bulk metals is best described according to band theory see Band Theory). Understandably, bonding descriptions of cluster compounds may be expected to become increasingly complex as the size of the cluster increases. 

Besides the classical donor atoms, C, O, N, P, S, and the halides. Re forms organometallic complexes containing... 

Organometallic complexes containing cr-bonded unsaturated moieties undergo protonation at the multiple bond. Reactions of HCl with cr-allylic complexes proceed as ... 

Protonation of organometallic complexes containing metal-carbon [Pg.388]

In general, any organometallic complex containing L- and X-type ligands may be represented by the general formula... 

Quantum yields are often useful quantitative measures of the efficiency of photochemical processes. Among the more traditional methods of quantum yield determination is ferrioxalate actinometry by UV-vis spectrophotometry. Since many organometallic complexes contain strong infrared chromophores, e.g. CEO, CENK, ve describe herein a method for determining quantum yields in Ca solution IK cells using a novel and simple actinometer the photochemical disappearance of tta lCO)in neat CCl to give Mn(CO)5CI (1). 

A review on organometallic complexes containing a bond between a Group III metal (Al, Ga, In, or Tl) and a transition metal has been published. ... 

Reviews, which include coverage of diffraction studies of organometallic complexes containing silicon-transition metal bonds, have appeared in 1973380 and 1982381. The vast majority of structural characterizations are for tne later transition metals (groups... 

A low oxidation state organometallic complex contains tt-acceptor ligands and the metal centre tends to acquire 18 electrons in its valence shell (the 18-electron rule), thus filling the valence orbitals, e.g. Cr in Cr(CO)g, Fe in Fe(CO)5, and Ni in Ni(CO)4. 

SCHEME 13 The reductive pathway to organometallic complexes containing La" and Ce". 

---