COMMUNICATIONS 111IV molecular growth away from the surface in a similar fashion to that envisaged for the Cz; -induced polymerization observed with 1,3-butadiene; however, ethylene oxide oligomers should show an increasing tendency for unimolecular cyclization to form a relatively stable six-membered ring at the end of the chain as Coulombic repulsion weakens with increasing charge separation. Structures V and VI show the products of this cyclization which would inhibit further chain propagation.

Gold Palladium Cluster, Synthesis, Crystal Structure Photolysis of a mixture of (Ph3P)2Pd(N3)2, Ph3PAuN3 and PhsPAuCI yields [(Ph3PAu)g(AuCl)4Pd] after chromatographic separation. The cluster crystallizes in the tric linic space group P i with a = 1675.45(8), b = 1870.57(6), c = 2673,15(9) pm, a = 82.30(3)°, ß = 75.90(3)°, 7 = 73.02(3)°, Z = 2. The twelve gold atoms form an icosahedron with the Pd atom in its center, and distances Pd-Au between 271.0(3) and 278.2(4) pm. The Au-Au distances range from 277.1(2) to 298.3(2) pm. Einleitung

Durch Photolyse der Azidokomplexe [Ph3PAuN3] und [(dppe)Pd(N3)2] oder [(Ph3P)2Pd(N3)2] bei denen die zwölf Goldatome ein Ikosaeder bilden, das ein zentrales Pd‐Atom einschließt. 1 und 2, bei denen die zwölf Goldatome ein Ikosaeder bilden, das ein zentrales Pd‐Atom einschließt. 1 und 2, die ersten ikosaedrischen Au12‐Cluster mit einem heteroatom im Zentrum, sind isoelektronisch mit dem Au13‐Cluster [(PhMe2PAu)10(AuCl)2Au]3+.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.