Hydrothermal synthesis, thermal and luminescent investigations of lanthanide(III) coordination polymers based on the 4,4′-oxybis(benzoate) ligand (original) (raw)
Related papers
Journal of Analytical and Applied Pyrolysis, 2015
The complexes of lanthanide ions with V-shaped 4,4-sulfonyldibenzoic acid (H s sdb) of the formula Ln 2 sdb 3 •nH 2 O, where Ln = La(III), Nd(III), Eu(III), Tb(III), Dy(III), Yb(III) and n = 2-6 have been prepared by the hydrothermal method. The complexes were examined by elemental analysis, infrared spectroscopy (ATR-FTIR), X-ray diffraction pattern measurements and different methods of thermal analysis (TG-DSC and TG-FTIR). The luminescence properties of Eu(III) and Tb(III) complexes have been also investigated. The complexes crystallize in the triclinic (La, Nd and Eu) or monoclinic (Tb, Dy, Yb) crystal systems. Additionally, pentahydrate complexes of Dy(III) and Tb(III) are isostructural. 4,4-sulfonyldibenzoate ligand coordinates lanthanide ions through both carboxylate groups. Heating of the complexes resulted in dehydration and formation of stable Ln 2 sdb 3 compounds. Combustion of the organic ligand leads to the formation of intermediate stable lanthanide oxysulfate Ln 2 O 2 SO 4 which further decompose into the suitable oxides. In nitrogen atmosphere, investigated complexes release: water, carbon oxides, disulphur oxide and benzene molecules. The Eu(III) and Tb(III) complexes exhibit characteristic red and green luminescence.
Journal of Chemical Crystallography, 2011
Self-assemblies of the organic ligand 4,4 0oxybis(benzoic acid) with metal salt (Eu 3? ) have led to one new complex, namely, Eu(oba) 2 (phen) (1) (oba = 4,4 0oxybis (benzoic acid), phen = 1,10-phenanthroline). The structure was determined by single crystal X-ray crystallography and further characterized by elemental analysis and IR spectra. X-ray diffraction analysis reveals that it crystallizes in the monoclinic C2/c space group with a = 13.4943 Å , b = 19.3737(18) Å , c = 27.359(2) Å , b = 99.539°, V = 7053.7(1) Å 3 , Z = 8, l = 1.862, F(000) = 3376. The Eu(III) ions along the a-axis are bridged by oba ligand into infinite oval-like one-dimensional chain. Interestingly, because of the existing of hydrogen bonging (O5-H5ÁÁÁO6), the title complex further formed a 2D layer structure with an interlayer separation of ca. 19.3737(18) Å . The complex exhibits excellent fluorescence property.
Inorganic Chemistry Communications, 2012
Hydrothermal reaction of lanthanide(III) (Nd, Er and Tm) chloride with sodium salt of 4,4′-oxybis(benzoic) acid (H 2 oba) leads to the formation of two types of monocrystals: prismatic [Nd(Er)(Hoba)(oba)(H 2 O) 2 ]•0.8H 2 O (1, 2) and plate-shaped [Tm 2 oba 3 (H 2 O) 4 ]•1.38H 2 O (3) for which single-crystal X-ray measurements were performed. Isomorphous compounds 1 and 2 consist of eight-coordinated lanthanide ions bonded with oba, Hoba and aqua ligands into the 2D layers. In the structure 3 two types of Tm(III) centers are bridged by oba linkers into 2D layer architecture. Uncoordinated water molecules are located within the cavities between layers. Furthermore, the ATR-IR spectra of isolated monocrystals and thermal behaviours of the compounds are discussed.
Inorganica Chimica Acta, 2007
Na 2 [Ln 2 (sal) 4 (CF 3 SO 3 ) 2 (H 2 O) 4 ](CF 3 SO 3 ) 2 ] n Ln = Nd (1) and Eu (2) were synthesized from the reaction of salicylaldehyde, lanthanide(III) triflates, and sodium hydroxide. The compounds are iso-structural and possess a 2-D supramolecular network built up from discrete dinuclear Ln(III) units [Ln 2 (sal) 4 (CF 3 SO 3 ) 2 (H 2 O) 4 ] via exo-coordination of Na(CF 3 SO 3 ). The sal ligands display l 2 -O coordination modes involving both the phenolic and carbonyl oxygen atoms while the triflates function as both l 2 and l 3 bridges. Each Ln(III) in the network is eight coordinate and in bicapped trigonal prism coordination geometry. Luminescence from [Na 2 [Eu 2 (sal) 4 (CF 3 SO 3 ) 2 (H 2 O) 4 ](CF 3 SO 3 ) 2 ] n showed temperature dependent sensitized emission with significant quadrupolar contribution and decay dynamical studies followed single exponential kinetics. Together these results indicate that in the presence of Na + ions, sal, and triflate are useful ligands in the construction of Ln(III) coordination polymers with unusual luminescence and structures.
Polyhedron, 2001
This paper presents the hydrothermal synthesis of a series of new isomorphous bis-dipicolinato lanthanide complexes: Ln(Hdipic)(dipic) with Ln = Eu, Gd, Tb, Dy, Ho, Er, Yb, and dipic = 2,6-pyridinedicarboxylate. A structural study has been realised for the Ho 3 + complex. It crystallises in a two-dimensional network, where sheets are parallel to the (100) plane. The luminescent properties of the analogous Eu 3 + complex have been investigated. The composition of the 7 F J levels is consistent with a true C 1 local symmetry: six oxygen and two nitrogen atoms forming a distorted square antiprism. The 5 D 0 emission lifetime is only slightly shorter than in [Eu(dipic) 3 ] 3 − in solution, but the ligand to metal energy transfer is much less efficient.
Materials
Solvothermal reactions of lanthanide (III) salts with 1,2-phenylenediacetic acid in N,N′-dimethylformamide (DMF) solvent lead to the formation of the metal complexes of the general formula Ln2(1,2-pda)3(DMF)2, where Ln(III) = Pr(1), Sm(2), Eu(3), Tb(4), Dy(5), and Er(6), 1,2-pda = [C6H4(CH2COO)2]2−. The compounds were characterized by elemental analysis, powder and single-crystal X-ray diffraction methods, thermal analysis methods (TG-DSC and TG-FTIR), infrared and luminescence spectroscopy. They exhibit structural similarity in the two groups (Pr, Sm, and Eu; Tb, Dy, and Er), which was reflected in their thermal behaviours and spectroscopic properties. Single-crystal X-ray diffraction studies reveal that Sm(2) and Eu(3) complexes form 2D coordination polymers with four crystallographically independent metal centers. Every second lanthanide ion is additionally coordinated by two DMF molecules. The 1,2-phenylenediacetate linker shows different denticity being: penta- and hexadentate ...
Data in Brief, 2019
In this work are presented all the conditions of synthesis explored to obtain a new family of compound with formula [Ln(4-OHBBA) 3(H2O)2] (Ln ¼ La, Pr). Powder X ray diffraction was used to identify the different phases obtained in the synthetic study. FT-IR spectroscopy and TG analysis for La and Pr pure phases are also reported. Optical properties of optically active CPs materials, solid state photoluminescence properties of La, Pr, La-(5%Eu) and La-(5%Tb) compounds were explored. We report the absorption, excitation and emission spectrum of the 4 0-hydroxi-4biphenylcarboxylic acid and a comparative description of the radiative (and no-radiative) processes in solid state in Ln-(4-OHBBA) and Ln-BPDC compounds. Finally, a principal component analysis was conducted in order to take in account both signal contributions from the sensor (LCE at 384 nm and the europium
Journal of Luminescence, 2016
The linear linker 1,3-bis(2-methylimidazolyl)propane (Bmip) has been used to construct two new coordination polymers with Zn 2+ and Co 2+ ions and carboxylate donor ligand viz., 4,4'-oxydibenzoic acid (H 2 Oba). Compounds formed hydrothermally are [Zn(Bmip)(Oba)] n (Ι), [Co(Bmip)(Oba)] n (II). Complexes Ι and II have been characterized by single crystal X-ray diffraction (CIF files CCDC nos. 1033354 (I), 1001813 (II)), IR spectroscopy, thermogravimetry, elemental analysis and powder X-ray diffraction. Single crystal X-ray analysis revealed that complexes Ι and II are isostructural, which exhibit 2D 4 4-sql net. And the adjacent 4 4-sql net are further inforced through weak noncovalent C-H•••π and H-bonding to form a 3D supramolecular framework. Furthermore, the photoluminescence property of complexes Ι and II in the solid state at room temperature was also investigated.
Journal of Molecular Structure, 2004
Ln(oba)(Hoba)(phen)] n (Ln ¼ Er (1), Yb (2)) and [Er 2 (bpndc) 3 (phen)] n (3) were obtained by hydrothermal reaction of LnCl 3 with 4,4 0oxybis(benzoic acid) (H 2 oba), benzophenone-4, 4 0 -dicarboxylic acid (H 2 bpndc) and 1,10-phenanthroline (phen), respectively, and characterized by single-crystal X-ray diffraction. The crystal structure reveals that 1 and 2 are isomorphous. In the asymmetric unit of 1 and 2, each Ln(III) center is eight-coordinated. 1D chains with two types of rings are formed by Ln(III)-O coordination bond, while 2D network and 3D supramolecular structures are built up by hydrogen bonds and p -p stacking, respectively. Complex 3 is a 3D structure composed of two crystallographically independent Er(III) atoms through bridging bpndc ligands. q