Luminescent Study on Nd³⁺ Complexes Containing Carboxylate‐Dithiolene and Alkoxide‐Dithiolene Ligands

Abstract

Reaction of ligand LH 2 (4,5-bis[carboxymethylthio]-1,3dithiol-2-thione) with neodymium silyl-amide (Nd[N(TMS) 2 ] 3 ; TMSϭ -SiMe 3 ), in a ratio 2:1, yields a neodymium-dithiolene-carboxylato complex (1) (Nd(LH)L). Similarly, reaction of 2 equivalents of LЈH 2 (4,5-bis[2Ј-hydroxyethyl)thio]-1,3-dithiol-2-thione) and one equivalent of neodymium silyl-amide (Nd[N(TMS) 2 ] 3 ) allowed the isolation of complex 2, with a ligand:metal ratio of 3:2. ATR-IR spectrum of 1 displays a broad band characteristic of an OH group showing that one carboxylate group remains protonated. Emission spectrum of complex 1 under excitation in the visible re-2551 gion (at 360 nm i.e. on the ligand) displayed typical emission bands of the Nd 3ϩ , showing that energy transfer from the ligand to the lanthanide was achieved (i.e. "antenna effect"). No significant quenching from the remaining ϪOH group was detected. In the case of complex 2, the main emission bands characteristic of the Nd 3ϩ ion have been observed, by excitation at 495 nm.

m-Ferrocenylbenzoate-bridged lanthanide coordination polymers: Syntheses, structures, electrochemical and magnetic properties

“…The structures were solved by direct methods using the program SHELXS-97 and all non-hydrogen atoms were refined anisotropically on F 2 by the full-matrix least-squares technique using the SHELXL-97 crystallographic software package Table 1 Crystallographic data and structural refinement for 1, 2 and 5. 16.916 (7) 16.840 (7) 17.702 (10) a ( ) 93.077 (14) 93.014 (16) 110.987 (9) b ( ) 94.280 (13) 94.144 (14) 90.917 (9) g ( ) 95.394 (11) [ 24,25]. Pertinent crystallographic data and structural refinement for 1, 2 and 5 are listed in Table 1.…”