Polynuclear complexes remote

MMCT excitations are observed in polynuclear complexes in which two or more metal centres are bound directly (M-M) or by the ligand bridge (M-Lb-M). The latter case of remote CT resembles the LLCT transition (L-M-L), because... 

Fig. 3. EXAFS in mononuclear and polynuclear complexes a) remote complexes are ignored b) next nearest heavy neighbours can be seen...

Taking the imaginative, though somewhat futuristic approach out-lined in Section 1.4, some of the polynuclear complexes discussed in this article can be viewed as very simple photochemical molecular devices. Examples are the Ru(II)-Cr(III) chromophore-luminophore systems of Section 4, which perform the function of spectral sensitization (Fig 7a). The coupling of the systems for photoinduced electron transfer and charge shift described in Section 3 could lead to triads for photoinduced charge separation (Fig 7b). The trichromophoric systems described in section 5.2 can be viewed as very simple examples of the antenna effect (Fig. 7a), while the longer chain-like systems of Section 5.2 could be considered as "molecular optical fibers" suitable for remote photosensitization (Fig. 7a) and other related functions. The system described in Section 5.3, on the other hand, couples antenna effect and photoinduced electron transfer into an antenna-sensitizer function. 

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