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A series of potassium salts of di- and tri-arylsubstituted cyclopentadienes has been obtained by the metalation of the corresponding cyclopentadienes with benzylpotassium in THF media. Crystals of all compounds, afforded by recrystallization from THF/hexane, diglyme-THF/hexane and toluene/hexane mixtures, have been studied by X-ray diffraction. All studied potassium cyclopentadienides exhibit the luminescence at room temperature and overall quantum yield of photoluminescence for potassium salt of diarylsubstituted cyclopentadiene is 18%.

Organophosphate-chloride complexes [{(2,6- i Pr 2 C 6 H 3 -O) 2 POO} 2 LnCl(CH 3 OH) 4 ]·2CH 3 OH, Ln = Nd ( 1 ), Eu ( 2 ), Gd ( 3 ), and Tb ( 4 ) have been obtained and structurally characterized. Their reaction with 2,2':6',2″-terpyridine leads to the formation of 1:1 adducts ([{(2,6- i Pr 2 C 6 H 3 -O) 2 POO} 2 LnCl(terpy)(H 2 O) 2 (CH 3 OH)], Ln = Eu ( 5 ), Gd ( 6 ), Tb ( 7 ) with exception of Nd, where tris-diisopropylphenylphosphate complex [{(2,6- i Pr 2 C 6 H 3 -O) 2 POO} 3 Nd) (terpy)(H 2 O)(CH 3 OH)] ( 8 ) was obtained due to the ligand metathesis. A bright luminescence observed for the Eu and Tb organophosphate complexes is the first example of an application of organophosphate ligands for 4f-ions luminescence sensitization. Photophysical properties of all complexes were analyzed by optical spectroscopy and an energy transfer scheme was discussed. A combination of two types of ligands into the coordination sphere (phosphate and phenanthroline) allows designing the Eu surrounding with very high intrinsic quantum yield QEuEu (0.92) and highly luminescent Ln complexes for both visible and near-infrared (NIR) regions.