Emission spectra coordination compounds

Perylenediimides represent another class of photoactive dyes which are characterized by their strong fluorescence emission and facile electrochemical reduction. Recently, a supramolecular bis(phthalocyanine)-perylenediimide hetero-triad (compound 42) has been assembled through axial coordination [47]. Treatment of perylenediimide 43, which has two 4-pyridyl substituents at the imido positions, with 2.5 equiv. of ruthenium(II) phthalocyanine 44 in chloroform affords 42 in 68% yield (Scheme 3). This array shows remarkable stability in solution due to the robustness of the ruthenium-pyridyl bond. Its electronic absorption spectrum is essentially the sum of the spectra of its molecular components 43 and 44 in... 

Ln(tmhd)3(Me2phen)] (Ln = La, Eu, Tb, Ho) has two square antiprismatic isomers in the unit cell. Emissions from both isomers can be discerned in the fluorescence spectrum of the Eu compound and shows unusually high splitting of the "Dq Fq transition." " Eu(tmhd)3(terpy) is nine-coordinate, again with two slightly different molecules present in the crystal, its luminescence spectrum shows a broad but unresolved transition, even at 77 K. Average Eu—O... 

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