Homodinuclear lanthanide 9-anthracenecarboxylate complexes: Field induced SMM and NIR-luminescence

Abstract

We studied the effects of bromine substitution on the nonlinear absorption properties of aza-dipyrromethene dyes. Nonlinear absorption is measured at wavelengths of 1200, 1500, and 1700nm. At 1200nm, excited-state absorption due to two-photon excitation appears, and it is more pronounced in the brominated polymethine cyanine.

Magnetic and Luminescence Properties of 8-Coordinated Pyridyl Adducts of Samarium(III) Complexes Containing 4,4,4-Trifluoro-1-(naphthalen-2-yl)-1,3-butanedionate

“…According to the HSAB concept, lanthanide cations (Ln 3+ ) are classified as hard Lewis acids, and as a result, they exhibit strong binding affinity for hard Lewis bases including those containing O-donor ligands such as β-diketone compounds, where tris(β-diketonate) species are most likely formed [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. The resulting complexes show a high tendency to expand their coordination numbers (CNs) from 6 to 9, and in some cases up to 12, through further interaction with various solvent molecules and/or auxiliary ligands such as hetero-atomic molecules [26][27][28][29][30][31][32][33][34][35][36], where the resulting coordinated β-diketonates act as efficient "antenna ligands" for lanthanides emitting in the UV, visible, and NIR region . It has been stated that luminescence efficiency of the β-diketonate complexes can be enhanced by the appropriate choice of the Ln 3+ ion and a combination of aromatic and fluorinated alkyl groups into the β-diketone ligands.…”

Structural Characterization, Magnetic and Luminescent Properties of Praseodymium(III)-4,4,4-Trifluoro-1-(2-Naphthyl)Butane-1,3-Dionato(1-) Complexes

“…Moreover, complexes of Pr(III), Er(III) and Yb(III) containing the Schiff base N 2 ,N 3 -bis(anthracen-9ylmethylene)pyridine-2,3-diamine (SBL) showed in vitro cytotoxicity against some human cancer cell lines [26] and the role of Ln(III) complexes to bind, cleavage of DNA also in diagnosis, and monitoring the treatment of cancer disease was recently summarized [27]. In addition to these applications, the presence of large number of unpaired f-electrons and the large intrinsic magnetic anisotropy of the lanthanide compounds [3,[28][29][30][31][32] utilized a useful way in the design of molecular magnetic materials (SMMs) [3,[33][34][35][36][37][38][39][40][41][42][43].…”

“…Although the intermolecular interaction forces of Ln 3+ with chelated ligand(s) are electrostatic in nature, steric factors rather than electronic ones [44] dominate the geometry of the complexes and as a result, the Ln 3+ complexes containing the same ligand are usually all isostructural. The interactions of β-diketonato ligands with Ln 3+ produces thermodynamically stable complexes [9,17,40,41,43,[45][46][47][48], where the coordinated βdiketonates act as efficient antenna ligands for lanthanides emitting in the visible and NIR region [1][2][3][4]6,17,36]. The resulting Ln(III)-β-diketonates complexes may display coordination numbers (C.N.)…”

“…with the Ln 3+ ions. In most of these complexes, the central Ln 3+ ion is coordinated to 3 bidentate-β-diketonate anions, resulting in the presence of several vacant coordination positions, which may be available for the interaction with various solvent molecules and/or ancillary ligands [36,[48][49][50][51].…”

Crystal Structures, Thermal and Luminescent Properties of Gadolinium(III) Trans-1,4-cyclohexanedicarboxylate Metal-Organic Frameworks

“…The most intensive electron transitions in Gd 3+ occur in the ultraviolet region of 290-318 nm with the narrow-banded emission and have been applied in common lasers. Under a soft UV and visible excitation, Gd(III) is a non-emissive center and the luminescence of its coordination compounds is ligand-centered [15][16][17][18][19][20][21][22][23].…”