Synthesis and Luminescent Properties of Lanthanide Complexes with Naphthylboronic Acid

Herein, heteroleptic complexes [Ln(NpBO 2 H) 3 (TPPO) 2 (DME)] n (Ln = La ( 1 ), Sm ( 2 ), Eu ( 3 ), Yb ( 4 )), [CpLn(NpBO 2 )(DME)] n (Ln = La ( 5 ), Nd ( 6 )) and [Cp 2 Ln(NpBO 2 H)(DME)] 2 (Ln = Sm ( 7 ), Er ( 8 ), Yb ( 9 )) were synthesized using Ln[N(SiMe 3 ) 2 ] 3 or Ln(Cp) 3 as starting materials. The complexes 7 – 9 were structurally characterized. The lanthanum derivatives 1 and 5 exhibited phosphorescence at 77 K. Photoluminescence (PL) spectra of Sm ( 2, 7 ) and Eu ( 3 ) complexes contain the bands of f-f transitions typical for the corresponding metal ion. The ytterbium derivatives 4 and 9 exhibited NIR metal-centered photoluminescence of the Yb 3+ ion.