Yttrium and lanthanide complexes of β-dialdehydes: synthesis, characterization and luminescence of coordination compounds with the conjugate base of nitromalonaldehyde

Abstract

Coordination compounds having formulae [AsPh4][Ln(NMA)4] (1(Ln)), Ln(NMA)3(tppo)2 (2(Ln)), Ln(NMA)3(bipyO2) (3(Ln)), Ln(NMA)3(phen) (4(Ln)) and Ln(NMA)3(terpy) (5(Ln)) (Ln = Y and some lanthanides; NMA = conjugate base of nitromalonaldehyde; tppo = triphenylphosphine oxide; bipyO2 = 2,2'-bipyridine-N,N'-dioxide; phen = 1,10-phenanthroline; terpy = 2,2':6',2''-terpyridine) were synthesized and characterized and X-ray diffraction data were collected for [AsPh4][Y(NMA)4] (1(Y)). The neutral europium derivatives showed appreciable luminescence in the solid state upon excitation with UV light and photoluminescence measurements were carried out. These compounds were used as dopants for the preparation of luminescent poly(methyl methacrylate). Luminescent polyvinylpyrrolidone samples were obtained by reacting the pure polymer with water solutions containing NMA and trivalent europium ions.

Yttrium and lanthanide complexes of β-dialdehydes: synthesis, characterization, luminescence and electrochemistry of coordination compounds with the conjugate base of bromomalonaldehyde

“…The substi- tution of the -NO 2 groups with -Br causes very small variations of the equilibrium geometries and the Y-O bond lengths are closely comparable to those computed for 3 Y -5 Y . 3 Both in 7 Y and 8 Y the stationary points correspond to distorted square antiprisms. One of the two Y-O(bipyO 2 ) bond lengths is 2.337 Å, similar to the Y-O(BrMA) distances, while the other one is meaningfully longer, 2.498 Å.…”

“…Neutral and charged BrMA complexes were prepared following procedures comparable to those described for analogous NMA derivatives. 3 The poor luminescence exhibited by the ytterbium derivatives with β-dialdehydes suggested to limit the syntheses to the visible-emitting Eu(III) and Tb(III) ions, besides the diamagnetic Y(III) metal centre.…”

“…The only known complex of the conjugate base of malonaldehyde (MA) with a transition metal is the homoleptic chromium derivative Cr(MA) 3 , 1 while a detailed studied on the chemistry of NMA (NMA = conjugate base of nitromalonaldehyde) towards d-block metal centres has been carried out by Albertin and co-workers, who have synthesized and investigated on the reactivity of complexes of Fe(II), Co(II), Ni(II), Pd(II), Pt(II), Cu(II) and Zn(II). 2 In a recently submitted paper, 3 we have reported on the preparation and characterization of yttrium and lanthanide coordination compounds with NMA, having formulae [AsPh 4 ][Ln(NMA) 4 ] (1 Ln ), Ln-(NMA) 3 (tppo) 2 (2 Ln ), Ln(NMA) 3 (bipyO 2 ) (3 Ln ), Ln(NMA) 3 ( phen) (4 Ln ) and Ln(NMA) 3 (terpy) (5 Ln ) (Ln = Y and some lanthanides; tppo = triphenylphosphine oxide; bipyO 2 = 2,2′-bipyridine-N,N′-dioxide; phen = 1,10-phenantroline; terpy = 2,2′:6′,2″-terpyridine). In the uncharged europium derivatives, the antennaeffect caused the typical red emission from the metal centre upon excitation with UV light.…”

Photoemissive polymer composite based on new Y(III), Gd(III), and Tb(III) complexes with N-hydroxyphthalimide

“…16 Materials based on yttrium complexes are attractive due to their potential applications in lasers, optics, displays, sensors, or catalysts and experimental studies led to several materials being deemed useful for applications in electroluminescent devices. 17,18 Regarding polymer composites, polystyrene (PS), polycarbonate (PC), poly-(N-vinyl-pyrrolidone) (PVP), poly-(vinyl alcohol) (PVA), and poly-(methyl methacrylate) (PMMA) were successfully used as matrices for the preparation of photoluminescent composites. …”