Copper complexes bridging ligands

In order to introduce more flexibility into the structure of dinuclear copper(II) complexes, bridging ligands of type Y, such as p-XYLpy2 (261),595 have been combined with simple anion bridging ligands, such as Cl-, OH-, (CN)-, (OPh)- and (N3)-, to produce very asymmetric... 

Fig. 25 Several dinuclear nickel and copper complexes bridged by a tetrathiooxalato ligand...

Scheme 61).22 149 150 152 229 230 The methylene-bridged bis(oxazoline)s (70) can afford either neutral copper complexes of the semicorrin type (72) or cationic copper complexes (73). Cyclopro-panation with copper complexes of type (70) shows similar stereochemistry to that with the corresponding copper semicorrin complexes.229-231 Alternatively, bis(oxazoline) ligand (71), bearing... 

X-ray crystallographic data has become available on the commercially important 1 1 copper complex azo dyes. The symmetrical dihydroxyazo ligand (16) forms the 1 1 square planar complex (17).13 A pyridine molecule occupies the fourth coordination site since this complex facilitated the formation of crystals suitable for X-ray diffraction. The complex (17) actually exists as an unusual trimer which is held together by long bridging interactions between the copper atom in one molecule and one of the hydroxy oxygen atoms from the adjacent molecules. 

FIGURE 24. The mrta-chloroperbenzoate anion as bridging ligand in binuclear copper(II) complex... 

---