Studies on two coordination polymers [M(μ4-pz25dc)]n (M=Cd or Zn, pz25dc=pyrazine-2,5-dicarboxylato) with three-dimensional pillared-layer three-nodal framework: Synthesis, structural characterization, strong optical non-linearities and optical limiting properties

Liu, Fa‐Qian; Li, Rong-Xun; Deng, Yan; Li, Weihua; Ding, Naixiu; Liu, Guangye

doi:10.1016/j.jorganchem.2009.07.005

Cited by 9 publications

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“…Such an oxidation is very attractive, because two carboxylate groups as substituents in the heterocyclic pyrazine ring allow multiple coordination modes as shown in Chart b. This variety of the coordination modes of the 2,5-pzdc 2– dianion makes it a suitable molecule for the straightforward design and construction of hybrid organic–inorganic materials with different structures and physical properties. ,,,− It deserves to be noted that the oxidation to carboxylate of the methyl group of the Hmpca acid leading to the 2,5-H 2 pzdc acid was previously observed involving Eu 2 O 3 in the presence of HNO 3 as oxidant, and also in the hydrothermal reaction of Tm(NO 3 ) 3 ·6H 2 O and Hmpca in water …”

Section: Introductionmentioning

confidence: 99%

Photoluminescent and Slow Magnetic Relaxation Studies on Lanthanide(III)-2,5-pyrazinedicarboxylate Frameworks

et al. 2017

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In the series described in this work, the hydrothermal synthesis led to oxidation of the 5-methyl-pyrazinecarboxylate anion to the 2,5-pyrazinedicarboxylate dianion (2,5-pzdc) allowing the preparation of three-dimensional (3D) lanthanide(III) organic frameworks of formula {[Ln(2,5-pzdc)(HO)]·6HO} [Ln = Ce (1), Pr (2), Nd (3), and Eu (4)] and {[Er(2,5-pzdc)(HO)]·5HO} (5). Single-crystal X-ray diffraction on 1-5 reveals that they crystallize in the triclinic system, P1̅ space group with the series 1-4 being isostructural. The crystal structure of the five compounds are 3D with the lanthanide(III) ions linked through 2,5-pzdc dianions acting as two- and fourfold connectors, building a binodal 4,4-connected (4·68)(468)-mog network. The photophysical properties of the Nd(III) (3) and Eu(III) (4) complexes exhibit sensitized photoluminescence in the near-infrared and visible regions, respectively. The photoluminescence intensity and lifetime of 4 were very sensitive due to the luminescence quenching of the D level by O-H oscillators of four water molecules in the first coordination sphere leading to a quantum efficiency of 11%. Variable-temperature magnetic susceptibility measurements for 1-5 reveal behaviors as expected for the ground terms of the magnetically isolated rare-earth ions [F, H, I, F, and I for Ce(III), Pr(III), Nd(III), Eu(III), and Er(III), respectively] with M = 0 (2 and 4) and ±1/2 (1, 3, and 5). Q-band electron paramagnetic resonance measurements at low temperature corroborate these facts. Frequency-dependent alternating-current magnetic susceptibility signals under external direct-current fields in the range of 100-2500 G were observed for the Kramers ions of 1, 3, and 5, indicating slow magnetic relaxation (single-ion magnet) behavior. In these compounds, τ decreases with decreasing temperature at any magnetic field, but no Arrhenius law can simulate such a dependence in all the temperature range. This dependence can be reproduced by the contributions of direct and Raman processes, the Raman exponent (n) reaching the expected value (n = 9) for a Kramers system.

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Section: Introductionmentioning

confidence: 99%

Photoluminescent and Slow Magnetic Relaxation Studies on Lanthanide(III)-2,5-pyrazinedicarboxylate Frameworks

et al. 2017

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A Schiff base colorimetric chemosensor for CN^‐ ion and its dioxidomolybdenum (VI) complexes: Evaluation of structural aspects and optoelectronic properties

Asha

Edappadikkunnummal

Kurup

2020

Applied Organom Chemis

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Six new cis‐dioxidomolybdenum(VI) complexes featured with a tridentate ONO donor Schiff base derived from salicylidene‐2‐aminophenolato backbone have been synthesised and characterised by elemental analysis, spectroscopic techniques (like IR, UV‐vis and 1H‐NMR) and cyclic voltammetry. Suitable single crystals of the parent complex [MoO2L(MeOH)]2·H2O (1) was obtained by the slow evaporation of the mother liquor, whereas the crystals of the complexes 2‐6 were grown in coordinating solvents like ethanol, DMF, DMSO etc. and were characterised by single crystal X‐ray diffraction as monomers stabilised by the solvent molecules used for the recrystallization purpose. The structures of the complexes were further quantified using Hirshfeld surface analysis. The Schiff base acts as a colorimetric chemosensor for CN‐ ions in DMSO solution. The receptor‐CN‐ ion interaction and the sensing mechanism of the chemosensor were verified by colorimetric, UV‐vis, 1H‐NMR and FT‐IR spectroscopic studies. Hydroxyl moiety present in the receptor function as the binding site for cyanide ion thereby leading to its optical discrimination in presence of other anions by producing a visible colour change from colourless to yellow. Therefore the Schiff base sensor portrays estimable selectivity and sensitivity towards CN‐ ion. Additionally the Schiff base as well as the molybdenum complexes exhibit good third order non‐linear optical properties and optical power limiting when analysed by the Z‐scan technique.

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A New Copper(I) Complex Based on Imidazole and Triphenylphosphine Ligands: Synthesis, Structure, Third‐Order NLO, and Fluorescence Properties

et al. 2012

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A new candidate [Cu(PPh3)2Him]Br (1, PPh3=triphenylphosphine, Him=1‐H‐imidazole) for nonlinear optical (NLO) materials has been synthesized and characterized crystallographically. The third‐order NLO optical properties were measured by the Z‐scan technique with an 8 ns pulsed laser at 532 nm. Compound 1 exhibits strong NLO absorptive abilities [α2=(61±5)×10−12] and effective self‐focusing performance [n2=(15±3)×10−18 m2·W−1] in 1.01×10−4 mol·dm−3 DMF solution. The compound also exhibits luminescence in DMF solution at room temperature and shows narrow emission with maximum at 382 nm. The electronic structure and photoluminescent process were investigated by means of TD‐DFT calculations. The results suggest that the contribution to the frontier orbitals from the CuBr δ bond plays a crucial role in its linear optical properties, and the origin of luminescence is attributable to the π∗︁→n transitions.

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Studies on two coordination polymers [M(μ4-pz25dc)]n (M=Cd or Zn, pz25dc=pyrazine-2,5-dicarboxylato) with three-dimensional pillared-layer three-nodal framework: Synthesis, structural characterization, strong optical non-linearities and optical limiting properties

Cited by 9 publications

References 66 publications

Photoluminescent and Slow Magnetic Relaxation Studies on Lanthanide(III)-2,5-pyrazinedicarboxylate Frameworks

Photoluminescent and Slow Magnetic Relaxation Studies on Lanthanide(III)-2,5-pyrazinedicarboxylate Frameworks

A Schiff base colorimetric chemosensor for CN^‐ ion and its dioxidomolybdenum (VI) complexes: Evaluation of structural aspects and optoelectronic properties

A New Copper(I) Complex Based on Imidazole and Triphenylphosphine Ligands: Synthesis, Structure, Third‐Order NLO, and Fluorescence Properties

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Studies on two coordination polymers [M(μ4-pz25dc)]n (M=Cd or Zn, pz25dc=pyrazine-2,5-dicarboxylato) with three-dimensional pillared-layer three-nodal framework: Synthesis, structural characterization, strong optical non-linearities and optical limiting properties

Cited by 9 publications

References 66 publications

Photoluminescent and Slow Magnetic Relaxation Studies on Lanthanide(III)-2,5-pyrazinedicarboxylate Frameworks

Photoluminescent and Slow Magnetic Relaxation Studies on Lanthanide(III)-2,5-pyrazinedicarboxylate Frameworks

A Schiff base colorimetric chemosensor for CN‐ ion and its dioxidomolybdenum (VI) complexes: Evaluation of structural aspects and optoelectronic properties

A New Copper(I) Complex Based on Imidazole and Triphenylphosphine Ligands: Synthesis, Structure, Third‐Order NLO, and Fluorescence Properties

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A Schiff base colorimetric chemosensor for CN^‐ ion and its dioxidomolybdenum (VI) complexes: Evaluation of structural aspects and optoelectronic properties