Five novel lanthanide complexes with 2-chloroquinoline-4-carboxylic acid and 1,10-phenanthroline: Crystal structures, molecular spectra, thermal properties and bacteriostatic activities

Wang, Ye; Jin, Cheng-Wei; He, Shan; Ren, Nanqi; Zhang, Jianjun

doi:10.1016/j.molstruc.2016.07.007

Cited by 19 publications

(3 citation statements)

References 30 publications

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“…The relative emission of 5 D 0 → 7 F 1 transition at 592 nm was relatively strong, as it is a magnetic dipole transition which is independent of the coordination environment of Eu(III) ion. The hypersensitive transition 5 D 0 → 7 F 2 at 612 nm is the most intense transition,which dominates the whole emission spectrum, leading to the characteristic red luminescence of Eu(III) complex and the emission of Eu(III) ion often used as a sensitive probe to investigate the local environment around the ions . The 5 D 0 → 7 F 4 transition coupled with the splitting two peaks with not well‐defined character.…”

Section: Resultsmentioning

confidence: 99%

Four novel lanthanide complexes with 4‐ethylbenzoic acid and 5,5′‐dimethy‐2,2′‐bipyridine: Structures, luminescent, thermal properties and bacteriostatic activities

Shen

Zhu

Ren

et al. 2017

Applied Organom Chemis

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Four new lanthanide complexes [Ln(4-EBA) 3 (5,5′-DM-2,2′-bipy)] 2 ·2C 2 H 5 OH (Ln = Ho (1), Tb (2), Er (3)); [Ln(4-EBA) 3 (4-EBAH)(5,5′-DM-2,2′-bipy)] 2 (Ln = Eu(4); 4-EBA =4-ethylbenzoate; 5,5′-DM-2,2′-bipy =5,5′-dimethy-2,2′bipyridine; 4-EBAH = 4-ethylbenzoic acid) have been synthesized and characterized by elemental analysis and IR spectra. The single crystal results reveal that complexes 1-3 are isostructural. It is worth noting that the mole ratios of the carboxylate ligands and neutral ligands is 4:1 in complex 4, which is different from the former and has been rarely reported. Nevertheless, all complexes are connected to form 1D chain by π···π wake staking interactions. Additionally, the complexes 2 (Tb(III)) and 4 (Eu(III)) exhibit characteristic luminescent properties, indicating that ligands can be used as sensitizing chromophore in these systems. The thermal decomposition mechanism of the complexes has been investigated by TG/DSC-FTIR technology. Stacked plots of the FTIR spectra of the evolved gases show complexes broken down into H 2 O, CO 2 , and other gaseous molecules as well as the gaseous organic fragments. The studies on bacteriostatic activities of complexes show that four complexes have good bacteriostatic activities against Candida albicans but no bacteriostatic activity on Escherichia coli, and Staphylococcus aureus. Additionally, the complexes 1 to 3 have better bacteriostatic activities on Candida albicans than complex 4.

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Section: Resultsmentioning

confidence: 99%

Four novel lanthanide complexes with 4‐ethylbenzoic acid and 5,5′‐dimethy‐2,2′‐bipyridine: Structures, luminescent, thermal properties and bacteriostatic activities

Shen

Zhu

Ren

et al. 2017

Applied Organom Chemis

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“…The search of lanthanide aromatic carboxylic acid complexes have aroused great interest for their various and fascinating structures, which exhibit potential applications for extraction and separation, drug delivery, luminescent probes, and so on . These complexes combine central metallic units with organic N‐donor, which may enhance conjugate function, rigidity and stability, and reinforce the luminescent properties of the complexes .…”

Section: Introductionmentioning

confidence: 99%

Lanthanide Complexes with 2,3-Dimethoxybenzoic Acid and Terpyridine: Crystal Structures, Thermal Properties, and Antibacterial Activities

Shen

Ren³

et al. 2017

Z. Anorg. Allg. Chem.

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The lanthanide coordination complexes Er(2,3-DMOBA) 3 (terpy)(H 2 O) (1) and [Nd(2,3-DMOBA) 3 (terpy)(H 2 O)] 2 (2) (2,3-DMOBA = 2,3-dimethoxybenzoate; terpy = 2,2Ј:6Ј,2ЈЈ-terpyridine) were synthesized and characterized by IR spectroscopy, powder X-ray diffraction (XRD), single-crystal X-ray diffraction, and thermogravimetric analysis. Complex 1 crystallizes in the triclinic system, space group P1, and the mononuclear subunits form a 1D chain structure along the a axis by hydrogen bonds. Complex 2 crystallizes in the monoclinic system, space group P2 1 /c, and the dinuclear subunits are further linked via the offset face-to-face π···π weak stacking interactions to form a supramolecular 2D layered structure. Thermal analysis

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“…Due to their high magnetic moment and symmetric electronic ground state, gadolinium(III) complexes have been frequently chosen as MRI contrast agents [34]. As a consequence of the fluoride ions-induced displacement, the relaxivity of Gd(III) complexes thus could be finely tuned by changing in q (number of coordinated water molecular) upon the addition of targeted fluoride ions in aqueous solution (Scheme 1) [35,36,37,38,39,40,41,42,43]. …”

Section: Introductionmentioning

confidence: 99%

Visualization of Fluoride Ions In Vivo Using a Gadolinium(III)-Coumarin Complex-Based Fluorescence/MRI Dual-Modal Probe

Wang

Song

Feng

et al. 2016

Sensors

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A new Gadolinium(III)–coumarin complex, DO3A-Gd-CA, was designed and prepared as a dual-modal probe for simultaneous fluorescence and relaxivity responses to fluoride ions (F−) in aqueous media and mice. DO3A-Gd-CA was designed by using Gd(III) center as an MRI signal output unit and fluoride binding site, and the 4-(diethylamino)-coumarin-3-carboxylic acid (CA) as a fluorescence reporter. Upon the addition of fluoride ions to the solution of DO3A-Gd-CA, the liberation of the coordinated CA ligand led to a 5.7-fold fluorescence enhancement and a 75% increase in the longitudinal relaxivity (r1). The fluorescent detection limit for fluoride ions was determined to be 8 μM based on a 3σ/slope. The desirable features of the proposed DO3A-Gd-CA, such as high sensitivity and specificity, reliability at physiological pH and low cytotoxicity enable its application in visualization of fluoride ion in mice. The successful in vivo imaging indicates that DO3A-Gd-CA could be potentially used in biomedical diagnosis fields.

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Five novel lanthanide complexes with 2-chloroquinoline-4-carboxylic acid and 1,10-phenanthroline: Crystal structures, molecular spectra, thermal properties and bacteriostatic activities

Cited by 19 publications

References 30 publications

Four novel lanthanide complexes with 4‐ethylbenzoic acid and 5,5′‐dimethy‐2,2′‐bipyridine: Structures, luminescent, thermal properties and bacteriostatic activities

Four novel lanthanide complexes with 4‐ethylbenzoic acid and 5,5′‐dimethy‐2,2′‐bipyridine: Structures, luminescent, thermal properties and bacteriostatic activities

Lanthanide Complexes with 2,3-Dimethoxybenzoic Acid and Terpyridine: Crystal Structures, Thermal Properties, and Antibacterial Activities

Visualization of Fluoride Ions In Vivo Using a Gadolinium(III)-Coumarin Complex-Based Fluorescence/MRI Dual-Modal Probe

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