Hetero-poly-compounds

Bi et al. [39] reported an interesting study of six new hetero-poly-compoimds in the pVUCHzOMAsaW, 5056)2]series (M = Cu(II), Mn(n), Coai), Ni(II), Zn(n), Cd(II)). The two copper atoms of the C114O16 cluster are coordinated by water molecules. The replacement reactions of the coordinated water molecules of this series of hetero-poly-compounds in aqueous solutions and in selected organic solvents were reported. The results showed that [Fe(CN)6] > [Fe(CN>6], H2NCH2CH2NH2, etc., can replace the coordinated water to form its... 

An interesting and specific characteristic of poly-NHC ligands is the possibility of combining different carbene donors to form the so-called hetero-poly-NHC hgands. As already reported by Huynh and coworkers, the combination of two different donors did not lead always to Hgands with intermediate properties with respect to the corresponding homoleptic compounds. In fact, enhanced properties (e.g., catalytic properties) may be recorded in the corresponding complexes, which have been interpreted in terms of an electronic asymmetry . The most recent examples on this topic are reported in Fig. 8. 

The reactions, usually carried out in organic solvents, proceed under mild conditions and often give high yields of the desired compounds. Compounds in which the hetero-atom bears one alkynyl group are better known than the "poly"-alkynyl derivatives. This can be explained in part by the readier availability of the mono-halogeno compounds R nYX and by a lower... 

Hetero-coupling polycondenastion of di- and tri-vinylsilicon compounds with organic dienes has permitted the synthesis of dendrimeric poly(silylene-arylene-vinylenes). 

R. S. Ingram, M. J. Hostetler, and R. W. Murray, Poly-hetero-co-functionalized alkanethiolate-stabilized gold cluster compounds,/.dm. Chem. Soc. 119,9175-9178(1997). 

Ingram, R.S., Hostetler, M.J. and Murray, R.W. (1997) Poly-hetero-d-functionalized alkanethiolate-stabilized gold cluster compounds. Journal of the American Chemical Society, 119, 9175-8. 

---