Complexes as metals strategy

A. Complexes as Metals and Complexes as Ligands Synthetic Strategy. .. 65... 

The typical approach used to prepare polynuclear metal complexes is the so-called complexes as metals and complexes as ligands strategy, briefly illustrated... 

Bpy-type ligands (including phen, tpy and a vast range of substituted derivatives) may be assembled with a number of different metal centres to give versatile photochemical devices via the complexes as metals/complexes as ligands strategy (Scheme 11.1). If we envisage the synthesis of a mononuclear... 

Scheme 11.1 The complexes as metals/complexes as ligands strategy - a ruthenium (II) complex acts as a ligand for an osmium(II) complex.

Scheme 11.2 Dendrimer construction via the complexes-as-metals/complexes-as-ligands strategy -dendrimer generation increases ascending the diagram but growth is terminated by the horizontal processes.

Balzani et al. (70) employed a strategy focusing on complexes as metals and as ligands (71,72), for developing a number of interesting supramolecular systems. Ditopic polypyridyl ligands, for example, 2,3- and 2,5-dipyridylpyrazine (2,3-dpp and 2,5-dpp), 2,2 -biquinoline (biq), tetrapyrido[3,2-fl 2, 3 -c 3",2"-/z 2", 3 "-/]-phenazine (73,74) (tppz), and 2,3,5,6-tetrakis(2-pyridyl)pyrazine (75-77) (tpypz), in combination with monotopic ligands (e.g., bpy and phen) were utilized in the preparation of a number of homo- and heteropolynuclear complexes of well-defined structures (Fig. 2). 

A LUMINESCENT DECANUCLEAR RUTHENIUM(II) POLYPYRIDINE COMPLEX A CONVERGENT APPROACH TO A DENDRITIC STRUCTURE EMPLOYING THE COMPLEXES AS METALS/COMPLEXES AS LIGANDS SYNTHETIC STRATEGY... 

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