Eight dinuclear chiral compounds of the formula [Ln2(S-L)6(phen)2]·3DMF·H2O or [Ln2(R-L)6(phen)2]·3DMF·H2O [Ln = Eu, Gd, Tb and Dy], (S)-(+)- or (R)-(−)-2-(6-methoxy-2-naphthyl)propionic acid, S-HL or R-HL, are reported. Luminescence and magnetic studies are also reported.
The reaction of Ln(NO 3 ) 2 ·6H 2 O salts (Ln = Nd, Eu, Gd, Tb, Dy, Er and Yb) with 2-fluorobenzoic acid (H-2-FBz) and 1,10-phenanthroline (phen) in ethanol/water mixture allows the isolation of dinuclear compounds of the formula [Ln 2 (2-FBz) 4 -(NO 3 ) 2 (phen) 2 ] {Ln = Nd (1), Eu (2), Gd (3), Tb (4), Dy (5), Er (6)} and [Yb 2 (2-FBz) 6 (phen) 2 ] (7). The solid-state photoluminescence [a] 1928 study of the complexes shows the 4f-4f lanthanide transitions in the visible range, in the cases of 2, 4 and 5, and in the NIR range for 1, 6 and 7. Magnetic studies reveal field-induced single-molecule-magnet (SMM) behaviour for compounds 1, 5, 6 and 7.
The reaction of several Ln(NO 3 ) 3 ·6H 2 O salts with 9anthracenecarboxylic acid (9-HAC) and 2,2′-bipyridine (bpy) in a mixture of CH 3 OH/H 2 O has allowed the isolation of the dinuclear compounds 1-6 with formula [Ln 2 (μ 2 -9-AC) 4 (9-AC) 2 (bpy) 2 ] [Ln III = Nd (1), Eu (2), Gd (3), Tb (4), Er (5), and Yb (6)]. The molar magnetic susceptibility measurements of 1-6 in the 2-300 K temperature range indicate weak antiferromagnetic ex- [a]
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.
The reaction of Ln(NO)·6HO (Ln = Tb and Eu) with (S)-(+)-2-phenylpropionic acid (S-HL) and 1,10-phenanthroline (phen) in EtOH/HO allows the isolation of the dinuclear chiral compounds of the formula [Ln(S-L)(phen)]·2.5·S-HL in which Ln = Tb (S-1), Ln = Eu (S-2). The same synthesis by using (R)-(-)-2-phenylpropionic acid (R-HL) instead of (S)-(+)-2-phenylpropionic acid allows the isolation of the enantiomeric compounds with the formula [Ln(R-L)(phen)]·2.5·R-HL where Ln = Tb (R-1), Ln = Eu (R-2). All compounds show sensitized luminescence. The luminescence study, including the circularly polarized luminescence spectra of the four compounds, is reported. The magnetic behavior of S-1 and S-2 is also reported.
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