Copper linear chains

Besides, comparisons with other non-macromolecular gelling systems are in progress. Specially, we can co.mpare with a square planar copper complex, which aggregates in linear chains to gelify the cyclohexane (l ). It is immediatly noticed that characteristic times of the aggregation kinetics are correlated to the complexity of the molecular aggregation mechanism involved. 

There is agreement over the gross structural features of these linear chain chromium(II) complexes (and the isomorphous copper(II) analogues), but different models have been used for structural refinement. Phase transitions associated with the Jahn-Teller distortion (or to fi to y as the temperature is lowered) complicate the structural studies. 

Cu(bipy)(C204)] 2H20 (349)762 and contrasts with the linear copper atom chain oi... 

Compounds 1 and 2 are closely related to each other. Both exhibit linear chain structures in which the Cu2(hedp)2 dimers are connected by edge-shared CuOs square pyramids (Fig. la). Each hedp in the chains behaves as a bis(chelating) bridging ligand and links two copper ions in a c/s-bridging mode. This is different from the traw-bridging mode... 

Also linear chain complexes such as Pt(etn)4Cl3 which is known colloquially as Wolf-fram s red (etn being an abbreviation for ethylamine) have been studied successfully by resonance Raman spectroscopy (Clark, 1984). As example, we show in Fig. 6.1-12 the resonance Raman spectrum of a related halogen-bridged linear-chain species, [Pt(pn)2] [Pt(pn)2Br2] [Cu3Br5]2 (Clark et al., 1980). Although this species contains a complicated copper bromine chain, the resonance Raman spectrum (Fig. 6.1-12) is completely dominated by bands attributed to the v fundamental and its overtones n U[ of the platinum-bromine chain. 

Polymeric complexes are formed when copper(I) chloride reacts with dialkylhydrazines (105) or with 3,5,5-trimethylpyrazolidine. In Cu2Cl2(MeN=NMe) the structure consists of parallel Cl-Cu-Cl chains cross-linked by weak Cu-Cl bonds and strong Cu-N a bonds (47). Structures of CuI(PhN=NH) and Cu4Cl4(PhN=NH) may be similar (282, 290). Diazoaminobenzene copper(I) (110, 245) can be prepared from copper and the ligand it is dimeric with each copper linearly coordinated to 1,1 iV or 3,3 N atoms (48). The cation in [Cu(PhN2Ph)]-CIO4 may have a related structure (265). 

Fig. 60. List of ligands in copper(I) and silver complexes with linear chain, 2-D and 3-D networks.

---