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Nazarian R, Darabi HR, Aghapoor K, Sayahi H, Mohsenzadeh F, Atasbili L. Fast, Selective and Sensitive Fluorescence Detection of Levofloxacin, Fe 3+ and Cu 2+ Ions in 100% Aqueous Solution Via Their Reciprocal Recognition. J Fluoresc 2024; 34:1279-1290. [PMID: 37526872 DOI: 10.1007/s10895-023-03362-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Accepted: 07/19/2023] [Indexed: 08/02/2023]
Abstract
The fluorescence detection of ions and pharmaceutical effluents by using organic chemosensors is a valuable surrogate to the currently existing expensive analytical methods. In this regard, the design of multi-functional chemosensors to recognize desirable guests is of utmost importance. In this study, we first show that levofloxacin (LVO) is able to use as a fluorescent chemosensor for the detection of biologically important Cu2+ (turn-off) and Fe3+ (turn-on) ions via independent signal outputs in 100% aqueous buffer solutions. Next, using the reciprocal recognition of LVO and Fe3+ provides a unique emission pattern for the detection of LVO. This approach exhibited a high specificity to LVO among various pharmaceutical samples, namely acetaminophen (AC), azithromycin (AZ), gemifloxacin (GEM) and ciprofloxacin (CIP) and also showed great anti-interference property in urine. The attractive features of this sensing system are availability, easy-to-use, high sensitivity (limit of detection = 18 nM for Cu2+, 22 nM for Fe3+ and 0.12 nM for LVO), rapid response (5 s) with an excellent selectivity.
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Affiliation(s)
- Ramo Nazarian
- Nano & Organic Synthesis Lab, Chemistry and Chemical Engineering Research Center of Iran, Pajoohesh Blvd., km 17, Karaj Hwy, Tehran, 14968-13151, Iran
| | - Hossein Reza Darabi
- Nano & Organic Synthesis Lab, Chemistry and Chemical Engineering Research Center of Iran, Pajoohesh Blvd., km 17, Karaj Hwy, Tehran, 14968-13151, Iran.
| | - Kioumars Aghapoor
- Nano & Organic Synthesis Lab, Chemistry and Chemical Engineering Research Center of Iran, Pajoohesh Blvd., km 17, Karaj Hwy, Tehran, 14968-13151, Iran
| | - Hani Sayahi
- Nano & Organic Synthesis Lab, Chemistry and Chemical Engineering Research Center of Iran, Pajoohesh Blvd., km 17, Karaj Hwy, Tehran, 14968-13151, Iran
| | - Farshid Mohsenzadeh
- Nano & Organic Synthesis Lab, Chemistry and Chemical Engineering Research Center of Iran, Pajoohesh Blvd., km 17, Karaj Hwy, Tehran, 14968-13151, Iran
| | - Leila Atasbili
- Nano & Organic Synthesis Lab, Chemistry and Chemical Engineering Research Center of Iran, Pajoohesh Blvd., km 17, Karaj Hwy, Tehran, 14968-13151, Iran
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2
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Pinto SCS, Gonçalves RCR, Costa SPG, Raposo MMM. Colorimetric Chemosensor for Cu 2+ and Fe 3+ Based on a meso-Triphenylamine-BODIPY Derivative. SENSORS (BASEL, SWITZERLAND) 2023; 23:6995. [PMID: 37571777 PMCID: PMC10422517 DOI: 10.3390/s23156995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 07/29/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023]
Abstract
Optical chemosensors are a practical tool for the detection and quantification of important analytes in biological and environmental fields, such as Cu2+ and Fe3+. To the best of our knowledge, a BODIPY derivative capable of detecting Cu2+ and Fe3+ simultaneously through a colorimetric response has not yet been described in the literature. In this work, a meso-triphenylamine-BODIPY derivative is reported for the highly selective detection of Cu2+ and Fe3+. In the preliminary chemosensing study, this compound showed a significant color change from yellow to blue-green in the presence of Cu2+ and Fe3+. With only one equivalent of cation, a change in the absorption band of the compound and the appearance of a new band around 700 nm were observed. Furthermore, only 10 equivalents of Cu2+/Fe3+ were needed to reach the absorption plateau in the UV-visible titrations. Compound 1 showed excellent sensitivity toward Cu2+ and Fe3+ detection, with LODs of 0.63 µM and 1.06 µM, respectively. The binding constant calculation indicated a strong complexation between compound 1 and Cu2+/Fe3+ ions. The 1H and 19F NMR titrations showed that an increasing concentration of cations induced a broadening and shifting of the aromatic region peaks, as well as the disappearance of the original fluorine peaks of the BODIPY core, which suggests that the ligand-metal (1:2) interaction may occur through the triphenylamino group and the BODIPY core.
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Affiliation(s)
| | | | | | - M. Manuela M. Raposo
- Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.C.S.P.); (R.C.R.G.)
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3
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Hao C, Zhang F, Jiang T, Ma Y, Ji W, Shi Z. Perylene tetra-(alkoxycarbonyl) based ‘turn-on’ fluorescent probe for selective recognition of Cu(Ⅱ) and its fluorescence imaging in living cells. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Kim H, Suh B, Kim C. A pyridine‐dicarbohydrazide‐based chemosensor for detecting Al
3+
by fluorescence turn‐on. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Hyeongjin Kim
- Department of Fine Chemistry Seoul National University of Science and Technology Seoul South Korea
- Department of New and Renewable Energy Convergence Seoul National University of Science and Technology Seoul South Korea
| | - Boeon Suh
- Department of Fine Chemistry Seoul National University of Science and Technology Seoul South Korea
- Department of New and Renewable Energy Convergence Seoul National University of Science and Technology Seoul South Korea
| | - Cheal Kim
- Department of Fine Chemistry Seoul National University of Science and Technology Seoul South Korea
- Department of New and Renewable Energy Convergence Seoul National University of Science and Technology Seoul South Korea
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5
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6
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So H, Lee M, Kim C. A Unique Thiosemicarbazide‐Based Colorimetric Chemosensor for Fe
2+
in Pure Aqueous Solution with the Lowest Detection Limit. ChemistrySelect 2020. [DOI: 10.1002/slct.202002062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Haeri So
- Department of Fine Chemistry Seoul National Univ. of Sci. and Tech. (SNUT) Seoul 01188 Korea
| | - Minji Lee
- Department of Fine Chemistry Seoul National Univ. of Sci. and Tech. (SNUT) Seoul 01188 Korea
| | - Cheal Kim
- Department of Fine Chemistry Seoul National Univ. of Sci. and Tech. (SNUT) Seoul 01188 Korea
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7
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Yin G, Yao J, Hong S, Zhang Y, Xiao Z, Yu T, Li H, Yin P. A dual-responsive colorimetric probe for the detection of Cu 2+ and Ni 2+ species in real water samples and human serum. Analyst 2019; 144:6962-6967. [PMID: 31621707 DOI: 10.1039/c9an01451a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The monitoring of heavy transition metals has increasingly attracted great attention because they pollute the environment and have unique physiological functions. Chemosensors are useful tools for monitoring heavy transition metals due to their simple visualization, excellent sensitivity and high selectivity. Herein, we have developed a novel chemosensor for the detection of water-soluble Cu2+ and Ni2+ species with different mechanisms, and low detection limits of 2.1 nM for Cu2+ and 1.2 nM for Ni2+ were obtained. The colorimetric probe CPH has been applied to qualitative and quantitative detection of Cu2+ and Ni2+ species in real samples.
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Affiliation(s)
- Guoxing Yin
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.
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Shu T, Deng X, Dong C, Ruan Y, Yu Y. Diaminomaleonitrile-based Fluorophores as Highly Selective Sensing Platform for Cu 2. ANAL SCI 2019; 35:987-993. [PMID: 31105087 DOI: 10.2116/analsci.19p117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A colorimetric and turn-on fluorescent chemodosimeter 1 based on diaminomaleonitrile was synthesized for Cu2+ detection. It showed high selectivity and sensitivity towards Cu2+ over the other tested metal ions. Probe 1 in acetonitrile exhibited a strong absorption band at 530 nm and weak fluorescence emission when excited at 480 nm, while the addition of Cu2+ could lead to a 30-nm blue shift of the absorption band and a remarkable fluorescence enhancement. Moreover, the detection limit of probe 1 for Cu2+ was calculated to be 28 nM. Quite different from the reported mechanism based on a metal-complexation induced fluorescence enhancement, the sensing mechanism was proved to be based on the Cu2+-promoted hydrolysis reaction, which was confirmed by 1H NMR, 13C NMR and mass spectrum analysis. Studies on probe 2 were carried out to verify the universality of this sensing mechanism.
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Affiliation(s)
- Tingting Shu
- Institute for Interdisciplinary Research, Jianghan University
| | | | - Changzhi Dong
- University Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR CNRS 7086
| | - Yibin Ruan
- Technology Center of China Tobacco Guizhou Industrial Co. Ltd
| | - Yanhua Yu
- Institute for Interdisciplinary Research, Jianghan University
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Bai CB, Fan HY, Qiao R, Wang SN, Wei B, Meng Q, Wang ZQ, Liao JX, Zhang J, Zhang L, Chen SS, Miao H. Synthesis of methionine methyl ester-modified coumarin as the fluorescent-colorimetric chemosensor for selective detection Cu 2+ with application in molecular logic gate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 216:45-51. [PMID: 30877893 DOI: 10.1016/j.saa.2019.03.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 03/07/2019] [Accepted: 03/07/2019] [Indexed: 05/14/2023]
Abstract
A methionine methyl ester-modified coumarin derivative was designed and synthesized, which could discriminate Cu2+ from other metal ions in HEPES buffer (10 mM, pH 7.4)/CH3CN (40:60, V/V). The detection limit of WM toward Cu2+ was 1.84 × 10-7 M, which was lower than the concentration of Cu2+ in drinking water suggested by WHO and EPA. And the proposed coordination mode exhibiting the interaction between WM and Cu2+ was studied by UV-Vis, fluorescence spectrum, ESI-MS and FT-IR. Based on the fluorescent reversibility of WM, WM was considered as a molecular logic gate and molecular keypad lock. In addition, the test strips and the silica gel plates prepared from the solution of WM also demonstrate the favorable selectivity toward Cu2+.
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Affiliation(s)
- Cui-Bing Bai
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China; Anhui Province Key Laboratory for Degradation and Monitoring of Pollution of the Environment, 236037, China
| | - Hai-Yun Fan
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China
| | - Rui Qiao
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China; Anhui Province Key Laboratory for Degradation and Monitoring of Pollution of the Environment, 236037, China.
| | - Sheng-Nan Wang
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China
| | - Biao Wei
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China; Anhui Province Key Laboratory for Degradation and Monitoring of Pollution of the Environment, 236037, China
| | - Qian Meng
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China
| | - Zi-Qian Wang
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China
| | - Jia-Xin Liao
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China
| | - Jie Zhang
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China
| | - Lin Zhang
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China; Anhui Province Key Laboratory for Degradation and Monitoring of Pollution of the Environment, 236037, China
| | - Shui-Sheng Chen
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China; Anhui Province Key Laboratory for Degradation and Monitoring of Pollution of the Environment, 236037, China
| | - Hui Miao
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang, Anhui Province 236037, China; Anhui Province Key Laboratory for Degradation and Monitoring of Pollution of the Environment, 236037, China
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10
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Liu X, Li N, Xu MM, Wang J, Jiang C, Song G, Wang Y. Specific colorimetric detection of Fe 3+ ions in aqueous solution by squaraine-based chemosensor. RSC Adv 2018; 8:34860-34866. [PMID: 35547042 PMCID: PMC9087219 DOI: 10.1039/c8ra07345g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 10/02/2018] [Indexed: 11/21/2022] Open
Abstract
A new squaraine based chemosensor TSQ was developed for colorimetric detection of Fe3+ ions. A thymine moiety in TSQ was constructed to act as an ion acceptor. The sensor displayed an instant colorimetric response specific to Fe3+ over the other metal ions in 20% AcOH-H2O solution. The limit of detection was much lower than that of the environmental protection agency guideline (5.37 μM) in drinking water. A 1 : 1 binding between TSQ and Fe3+ ion was evidenced by Job's plot measurement, ESI-MS and Fourier transform infrared (IR) measurements. Moreover, the proposed sensing mechanism of the receptor towards Fe3+ was strongly supported by DFT calculation. Finally, the sensor has proven to be suitable in real sample applications.
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Affiliation(s)
- Xiaoqian Liu
- School of Pharmaceutical Engineering and Life Science, Changzhou University 213164 Jiangsu China
| | - Na Li
- School of Pharmaceutical Engineering and Life Science, Changzhou University 213164 Jiangsu China
| | - Min-Min Xu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 PR China
| | - Jianhao Wang
- School of Pharmaceutical Engineering and Life Science, Changzhou University 213164 Jiangsu China
| | - Chunhui Jiang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology 2 Mengxi Road Zhenjiang Jiangsu 212003 China
| | - Guoqiang Song
- School of Pharmaceutical Engineering and Life Science, Changzhou University 213164 Jiangsu China
| | - Yong Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 PR China
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11
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A high selective “ Turn-Off ” aminopyrene based cyclotriphosphazene fluorescent chemosensors for Fe 3+ /Cu 2+ ions. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.04.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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12
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Jakubek M, Kejík Z, Kaplánek R, Veselá H, Sýkora D, Martásek P, Král V. Perimidine-based synthetic receptors for determination of copper(II) in water solution. Supramol Chem 2017. [DOI: 10.1080/10610278.2017.1414216] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Milan Jakubek
- First Faculty of Medicine, Charles University , Prague, Czech Republic
- Faculty of Chemical Engineering, Department of Analytical Chemistry, University of Chemistry and Technology , Prague, Czech Republic
| | - Zdeněk Kejík
- First Faculty of Medicine, Charles University , Prague, Czech Republic
| | - Robert Kaplánek
- First Faculty of Medicine, Charles University , Prague, Czech Republic
- Faculty of Chemical Engineering, Department of Analytical Chemistry, University of Chemistry and Technology , Prague, Czech Republic
| | - Hana Veselá
- Faculty of Chemical Engineering, Department of Analytical Chemistry, University of Chemistry and Technology , Prague, Czech Republic
| | - David Sýkora
- Faculty of Chemical Engineering, Department of Analytical Chemistry, University of Chemistry and Technology , Prague, Czech Republic
| | - Pavel Martásek
- First Faculty of Medicine, Charles University , Prague, Czech Republic
| | - Vladimír Král
- First Faculty of Medicine, Charles University , Prague, Czech Republic
- Faculty of Chemical Engineering, Department of Analytical Chemistry, University of Chemistry and Technology , Prague, Czech Republic
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13
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Dongare PR, Gore AH, Kondekar UR, Kolekar GB, Ajalkar BD. A Quinazolinone based fluorescent chemosensor for selective detection of Fe(III) in aqueous media: Applications to pharmaceutical and environmental analysis. INORG NANO-MET CHEM 2017. [DOI: 10.1080/24701556.2017.1357631] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Pravin R. Dongare
- Department of Chemistry, Shivraj College of Arts, Commerce and D. S. Kadam Science College, Gadhinglaj, Maharashtra, India
| | - Anil H. Gore
- Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
| | - Uttam R. Kondekar
- Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
| | - Govind B. Kolekar
- Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India
| | - Balu D. Ajalkar
- Department of Chemistry, Shivraj College of Arts, Commerce and D. S. Kadam Science College, Gadhinglaj, Maharashtra, India
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Yang J, Xu X, Rui J, Wang Z, Zhang Y, Wang S, Wu L. Synthesis, optical properties and application of a set of novel pyrazole nopinone derivatives. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 183:60-67. [PMID: 28437686 DOI: 10.1016/j.saa.2017.04.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 03/19/2017] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
Pyrazole derivatives (4-6) were directly synthesized from β-pinene derivative nopinone, and they were characterized by Fourier transform infrared (FTIR) spectoscope, nuclear magnetic resonance (NMR), and mass spectrometry. Their optical properties were investigated by ultraviolet-visible spectroscopy and fluorescence spectroscopy. The three compounds emitted strong blue fluorescence in ethanol. Using a fluorescence quenching method, compound 4 could be used to detect the content (100.57%) of copper sulfate pentahydrate (≥99%) with a RSD of 1.98%, y=-0.1127×+2.7148, R2=0.9703 (Cu2+: 0.5-8.0×10-5mol/L), and compounds 4-6 also had utility of calculating the content of anhydrous ferric chloride at a wide range of concentration. Thus, compounds 4-6 are new functional fluorescents for detecting the content of some purchased products.
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Affiliation(s)
- Jinlai Yang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China; China National Bamboo Research Center, Hangzhou 310012, Zhejiang, China; Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province, Hangzhou 310012, Zhejiang, China
| | - Xu Xu
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China; Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing 210037, People's Republic of China
| | - Jian Rui
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China
| | - Zhonglong Wang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China
| | - Yan Zhang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China
| | - Shifa Wang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, People's Republic of China; Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing 210037, People's Republic of China.
| | - Liangru Wu
- China National Bamboo Research Center, Hangzhou 310012, Zhejiang, China; Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province, Hangzhou 310012, Zhejiang, China.
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15
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Boontom S, Boonkitpatarakul K, Sukwattanasinitt M, Niamnont N. Highly selective detection of Cu 2+ based on a thiosemicarbazone triphenylacetylene fluorophore. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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16
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Gorla L, Martí-Centelles V, Altava B, Burguete MI, Luis SV. Cu 2+ recognition by N,N'-benzylated bis(amino amides). Dalton Trans 2017; 46:2660-2669. [PMID: 28168262 DOI: 10.1039/c6dt04756d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Two new C2-symmetric N,N'-benzylated bis(amino amides) have been synthesised and their interaction with different transition metals studied using a variety of techniques including UV-Vis and CD spectroscopy or ESI-MS. The determination of the corresponding stability constants with Cu2+ has been possible, in H2O/CH3CN 7/3 v/v, for one of these ligands (4) using potentiometric titrations. The results obtained reveal that N-benzylation affords significant changes to their properties and is accompanied by an appreciable decrease in the corresponding complexation stability constants. However, this, along with the low kinetics associated to Ni2+, facilitates the recognition of Cu2+ by 4 that can be followed by the naked-eye up to the submillimolar range. Very interestingly, the chiral nature of this ligand provides an intense and well defined CD curve for the corresponding Cu2+ complex, very sensitive to the coordination geometry, facilitating the analysis of this interaction even at the μM range. The formation by both ligands (3 and 4) of square planar complexes with Cu2+ and Ni2+ displaying a 1 : 1 stoichiometry was confirmed by their X-ray crystal structures.
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Affiliation(s)
- Lingaraju Gorla
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Avda. Sos Baynat s/n., 12071 Castellón, Spain.
| | - Vicente Martí-Centelles
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Avda. Sos Baynat s/n., 12071 Castellón, Spain.
| | - Belén Altava
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Avda. Sos Baynat s/n., 12071 Castellón, Spain.
| | - M Isabel Burguete
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Avda. Sos Baynat s/n., 12071 Castellón, Spain.
| | - Santiago V Luis
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Avda. Sos Baynat s/n., 12071 Castellón, Spain.
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