Crystal Structure of the Lanthanum Nitrate Complex with N-(2-Amino-4-methylpyridinyl)benzoylacetamide

Abstract

The design of molecular rare-earth complexes with defined architecture is very important in order to investigate structure vs. properties relationships in rare-earth solid-state framework structures, liquid-crystalline materials, sensors or luminescent label design for specific biomolecule interactions. 1 We have been interested in employing self-assembly strategies for supramolecular rare-earth complexes, and have recently used the β-diketonate-type ligand as sensitizers for rare-earth luminescence. 2 In order to achieve supramolecular rare-earth complexes by self-assembly, and to explore the relationship between the structure and the luminescent properties, as one part of our systematic work, herein we report on the synthesis and crystal structure of the lanthanum nitrate complex with N-(2-amino-4-methylpyridinyl)benzoylacetamide.The ligand N-(2-amino-4-methylpyridinyl)benzoylacetamide (L) was prepared according to a procedures from the literature. 3 A solution of 0.3 mmol L in chloroform (2 cm 3 ) was added dropwise to a solution of 0.1 mmol La(NO3)3·6H2O in ethyl acetate (2 cm 3 ) at room temperature. The mixture was stirred at room temperature for 4 h. Also, the precipitated solid complex was filtered, washed, and dried in vacuo over P4O10 for 48 h. Single crystals of the title complex (Fig. 1) were grown from acetone solutions with slow evaporation at room temperature.Single-crystal X-ray diffraction studies of the title complex were performed on a BRUKER SMART 1000 CCD A solid complex of lanthanum nitrate with a β-diketonate-type ligand, N- (2-amino-4-methylpyridinyl)benzoylacetamide, was synthesized. The title complex was crystallized in the monoclinic system, space group C2/c with a = 25.005(5)Å, b = 11.636(2)Å, c = 17.706(3)Å, β = 124.837(1)˚, V = 4228.35(1)Å 3 , Z = 4. The complex has a symmetry of C2, and the geometry of La(III) is a distorted bicapped square antiprism. In the structure of the title complex, a 3D supramolecular network is formed by hydrogen-bond interactions.

Highly Stable Perovskite Quantum Dots Modified by Europium Complex for Dual-Responsive Optical Encoding

“…First, we synthesized a pH-responsive fluorescent rare-earth complex Eu­(PBA) 3 (H 2 O) 2 with EuCl 3 and N- (2-pyridinyl)­benzoylacetamide (HPBA), as shown in SI Figure S1. The deproton coordination of the ligand HPBA and Eu 3+ was confirmed by Fourier transform infrared (FTIR) (SI Figure S2) and UV–vis absorption spectra (SI Figure S3) of HPBA and Eu­(PBA) 3 , which were consistent with previous reports . Second, the coordinated water was replaced by 8-aminooctanoic acid (AA) through the coordination substitution reaction.…”

“…The deproton coordination of the ligand HPBA and Eu 3+ was confirmed by Fourier transform infrared (FTIR) (SI Figure S2) and UV−vis absorption spectra (SI Figure S3) of HPBA and Eu(PBA) 3 , which were consistent with previous reports. 40 Second, the coordinated water was replaced by 8-aminooctanoic acid (AA) through the coordination substitution reaction. The Gibbs free energy (ΔG) of the reaction system was calculated to be negative (SI Figure S1), indicating that the reaction is spontaneous.…”

“…Samples were synthesized with average edge lengths ranging 6.5 nm using a hot-injection method previously reported by Protesescu et al , Briefly, octadecene (5 mL) and PbBr 2 (66.06 mg, 0.18 mmol) were placed in a 25 mL three-neck flask, and the system was heated to 120 °C and degassed for 1 h. After that, the reaction system was protected by argon. Then oleylamine (1 mL) and oleic acid (1 mL) were injected and kept for 1 h. Next, the temperature was increased to 150 °C and remained at 150 °C for 5 min.…”

A paper-based lanthanide smart device for acid–base vapour detection, anti-counterfeiting and logic operations

“…The coordination compounds Tb-HPBA and Eu-PBA were easily prepared from Ln(NO 3 ) 3 •6H 2 O (Ln = Eu, Tb) and HPBA at room temperature, and the crystal structure of an analogous complex has been reported by our group. 20 Because of the coordination of HPBA with the lanthanide ions, the peaks at 1584 and 1275 cm −1 weakened in the FTIR spectra of Tb-HPBA and Eu-PBA. 15 Depending on the high specific surface area, gas permeability and other characteristics, 21 filter paper was chosen as a support for the obtained Eu 3+ and Tb 3+ complexes to develop a paper-based vapoluminescent sensor.…”

2-(((4h-1,2,4-Triazol-4-Yl)Imino)Methyl)Phenol Derived Schiff Bases And Their Pharmacological Importance

“…). All the reflections in the complexes are new ones and the patterns are also new ones and fairly strong which suggests that there is a complete conversion of reactants into products [30][31][32][33][34][35] .…”