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Paul M, Chattopadhyay A. Magneto-Luminescent Two-Dimensional Nanosheets of Gadolinium and Gold Nanocluster Assemblies with Surface Molecular Functionalization for White Light Emission. J Phys Chem Lett 2024; 15:8584-8592. [PMID: 39141067 DOI: 10.1021/acs.jpclett.4c01888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
We report the formation of photoluminescent two-dimensional (2D) crystalline nanosheet assemblies of gadolinium ions and ligand-stabilized gold nanoclusters (Gd-Au NCs). Transmission electron microscopy, selected area electron diffraction in conjunction with atomic force microscopy, and field-emission scanning electron microscopy analyses substantiated the 2D nature of Gd-Au NC nanosheets. The optical and magnetic properties of the nanosheets were investigated by photoluminescence measurements and vibrating-sample magnetometry analyses. The so-formed crystalline product was further utilized to generate a synchronous tricolor (orange, green, and blue) emission from a single excitation wavelength through an inorganic surface complexation reaction. The independent emissions were tunable after ligand functionalization by acetylsalicylic acid and fluorescein on the Gd-Au NC assembly. Interestingly, the assembled superstructure with augmented quantum yield led to white light emission at λexc ≈ 325 nm with CIE of (0.34, 0.33) and CRI value of >85 in the liquid phase. Furthermore, the ability to modulate the luminescence properties through the surface complexation of the 2D nanosheets of Au NCs may bring about new avenues toward applications in light-emitting devices, sensing, and biomedical imaging.
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Affiliation(s)
- Manideepa Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
- Department of Chemistry and Biochemistry, Sharda University, Greater Noida, Uttar Pradesh 201306, India
| | - Arun Chattopadhyay
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Assam 781039, India
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2
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Mondal A, Price CG, Tang J, Layfield RA. Targeted Synthesis of End-On Dinitrogen-Bridged Lanthanide Metallocenes and Their Reactivity as Divalent Synthons. J Am Chem Soc 2023; 145:20121-20131. [PMID: 37656516 PMCID: PMC10510326 DOI: 10.1021/jacs.3c07600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Indexed: 09/03/2023]
Abstract
High-yield syntheses of the lanthanide dinitrogen complexes [(Cp2tttM)2(μ-1,2-N2)] (1M, M = Gd, Tb, Dy; Cpttt = 1,2,4-C5tBu3H2), in which the [N2]2- ligands solely adopt the rare end-on or 1,2-bridging mode, are reported. The bulk of the tert-butyl substituents and the smaller radii of gadolinium, terbium, and dysprosium preclude formation of the side-on dinitrogen bonding mode on steric grounds. Elongation of the nitrogen-nitrogen bond relative to N2 is observed in 1M, and their Raman spectra show a major absorption consistent with N═N double bonds. Computational analysis of 1Gd identifies that the local symmetry of the metallocene units lifts the degeneracy of two 5dπ orbitals, leading to differing overlap with the π* orbitals of [N2]2-, a consequence of which is that the dinitrogen ligand occupies a singlet ground state. Magnetic measurements reveal antiferromagnetic exchange in 1M and single-molecule magnet (SMM) behavior in 1Dy. Ab initio calculations show that the magnetic easy axis in the ground doublets of 1Tb and 1Dy align with the {M-N═N-M} connectivity, in contrast to the usual scenario in dysprosium metallocene SMMs, where the axis passes through the cyclopentadienyl ligands. The [N2]2- ligands in 1M allow these compounds to be regarded as two-electron reducing agents, serving as synthons for divalent gadolinium, terbium, and dysprosium. Proof of principle for this concept is obtained in the reactions of 1M with 2,2'-bipyridyl (bipy) to give [Cp2tttM(κ2-bipy)] (2M, M = Gd, Tb, Dy), in which the lanthanide is ligated by a bipy radical anion, with strong metal-ligand direct exchange coupling.
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Affiliation(s)
- Arpan Mondal
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Brighton BN1 9QJ, U.K.
| | - Christopher G.
T. Price
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Brighton BN1 9QJ, U.K.
| | - Jinkui Tang
- State
Key Laboratory of Rare Earth Resource Utilization, Changchun Institute
of Applied Chemistry, Chinese Academy of
Sciences, Changchun 130022, P.R. China
| | - Richard A. Layfield
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Brighton BN1 9QJ, U.K.
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3
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Magneto-thermal and magnetization relaxation dynamics of a family of di-nuclear lanthanide complexes. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Wytrych P, Utko J, Kłak J, Ptak M, Stefanski M, Lis T, Ejfler J, John Ł. Synthesis, Crystal Structures, and Spectroscopic Properties of Novel Gadolinium and Erbium Triphenylsiloxide Coordination Entities. MOLECULES (BASEL, SWITZERLAND) 2021; 27:molecules27010147. [PMID: 35011379 PMCID: PMC8746333 DOI: 10.3390/molecules27010147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/20/2021] [Accepted: 12/23/2021] [Indexed: 11/16/2022]
Abstract
In alkali metal and lanthanide coordination chemistry, triphenylsiloxides seem to be unduly underappreciated ligands. This is as surprising as that such substituents play a crucial role, among others, in stabilizing rare oxidation states of lanthanide ions, taking a part of intramolecular and molecular interactions stabilizing metal-oxygen cores and many others. This paper reports the synthesis and characterization of new lithium [Li4(OSiPh3)4(THF)2] (1), and sodium [Na4(OSiPh3)4] (2) species, which were later used in obtaining novel gadolinium [Gd(OSiPh3)3(THF)3]·THF (3), and erbium [Er(OSiPh3)3(THF)3]·THF (4) configuration, it can result in res were determined for all 1-4 compounds, and in addition, IR, Raman, absorption spectroscopy studies were conducted for 3 and 4 lanthanide compounds. Furthermore, direct current (dc) variable-temperature magnetic susceptibility measurements on polycrystalline samples of 3 and 4 were carried out in the temperature range 1.8-300 K. The 3 shows behavior characteristics for the paramagnetism of the Gd3+ ion. In contrast, the magnetic properties of 4 are dominated by the crystal field effect on the Er3+ ion, masking the magnetic interaction between magnetic centers of neighboring molecules.
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Affiliation(s)
- Patrycja Wytrych
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland; (P.W.); (J.U.); (J.K.); (T.L.); (J.E.)
| | - Józef Utko
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland; (P.W.); (J.U.); (J.K.); (T.L.); (J.E.)
| | - Julia Kłak
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland; (P.W.); (J.U.); (J.K.); (T.L.); (J.E.)
| | - Maciej Ptak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 2 Okólna, 50-422 Wrocław, Poland; (M.P.); (M.S.)
| | - Mariusz Stefanski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 2 Okólna, 50-422 Wrocław, Poland; (M.P.); (M.S.)
| | - Tadeusz Lis
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland; (P.W.); (J.U.); (J.K.); (T.L.); (J.E.)
| | - Jolanta Ejfler
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland; (P.W.); (J.U.); (J.K.); (T.L.); (J.E.)
| | - Łukasz John
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland; (P.W.); (J.U.); (J.K.); (T.L.); (J.E.)
- Correspondence:
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5
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Durr CB, Williams CK. New Coordination Modes for Modified Schiff Base Ti(IV) Complexes and Their Control over Lactone Ring-Opening Polymerization Activity. Inorg Chem 2018; 57:14240-14248. [PMID: 30376308 DOI: 10.1021/acs.inorgchem.8b02271] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A series of eight new bis(alkoxy)bis(phenoxy-imine)titanium(IV) catalysts, coordinated by Schiff base ligands derived from o-vanillin (2-hydroxy-3-methoxybenzaldehyde), show good activity and control for the ring-opening polymerization of ε-caprolactone and ω-pentadecalactone. The new complexes are easily prepared in two high-yield steps from commercial reagents. The new ligands can all adopt two different coordination modes, depending on the steric bulk on the imine: a six-membered N-O chelate and/or a five-membered O-O chelate. The complexes show three different structures, depending on the ligand coordination mode: type A (N-O:N-O), type B (N-O:O-O), and type C (O-O:O-O). In all cases, the structures were confirmed in solution using variable temperature NMR spectroscopy and in the solid state using X-ray crystallography. The complex structure influences the polymerization rate, with the catalytic activities decreasing in the order: type C > type B > type A for both monomers. Overall, the work demonstrates potential to use these new ligands to access particular coordination modes, which allows enhancement of catalytic activity.
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Affiliation(s)
- Christopher B Durr
- Chemistry Research Laboratory, Department of Chemistry , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , United Kingdom
| | - Charlotte K Williams
- Chemistry Research Laboratory, Department of Chemistry , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , United Kingdom
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Rasamsetty A, Das C, Sañudo EC, Shanmugam M, Baskar V. Effect of coordination geometry on the magnetic properties of a series of Ln2 and Ln4 hydroxo clusters. Dalton Trans 2018; 47:1726-1738. [DOI: 10.1039/c7dt00172j] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Tetra and di-nuclear Lanthanide hydroxo clusters have been synthesized and characterized magnetically.
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Affiliation(s)
| | - Chinmoy Das
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India
| | - E. Carolina Sañudo
- Departament de Química Inorgànica i Institut de Nanociència i Nanotecnologia
- Universitat de Barcelona
- Barcelona
- Spain
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Upadhyay A, Vignesh KR, Das C, Singh SK, Rajaraman G, Shanmugam M. Influence of the Ligand Field on the Slow Relaxation of Magnetization of Unsymmetrical Monomeric Lanthanide Complexes: Synthesis and Theoretical Studies. Inorg Chem 2017; 56:14260-14276. [DOI: 10.1021/acs.inorgchem.7b02357] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Apoorva Upadhyay
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Kuduva R. Vignesh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Chinmoy Das
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Saurabh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Maheswaran Shanmugam
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
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Upadhyay A, Das C, Vaidya S, Singh SK, Gupta T, Mondol R, Langley SK, Murray KS, Rajaraman G, Shanmugam M. Role of the Diamagnetic Zinc(II) Ion in Determining the Electronic Structure of Lanthanide Single-Ion Magnets. Chemistry 2017; 23:4903-4916. [DOI: 10.1002/chem.201700399] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Apoorva Upadhyay
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Chinmoy Das
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Shefali Vaidya
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Saurabh Kumar Singh
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Tulika Gupta
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Ranajit Mondol
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Stuart K. Langley
- School of Science and the Environment; Division of Chemistry; Manchester Metropolitan University; Manchester M15 6BH UK
| | - Keith S. Murray
- School of Chemistry; Monash University; Clayton 3800 Victoria Australia
| | - Gopalan Rajaraman
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
| | - Maheswaran Shanmugam
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai, Maharashtra 400076 India
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9
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Das C, Upadhyay A, Vaidya S, Singh SK, Rajaraman G, Shanmugam M. Origin of SMM behaviour in an asymmetric Er(iii) Schiff base complex: a combined experimental and theoretical study. Chem Commun (Camb) 2015; 51:6137-40. [DOI: 10.1039/c4cc09523e] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The importance of ligand field and origin of SMM behaviour of an asymmetric [ErIII(HL)2(NO3)3] complex investigated in detail which is strongly supported by theoretical calculations. Dipolar interaction in 1 significantly reduced upon dilution which increases the barrier height to 51.5 K.
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Affiliation(s)
- Chinmoy Das
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India-400076
| | - Apoorva Upadhyay
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India-400076
| | - Shefali Vaidya
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India-400076
| | - Saurabh Kumar Singh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India-400076
| | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- India-400076
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10
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Cepeda J, Pérez-Yáñez S, Beobide G, Castillo O, García JÁ, Lanchas M, Luque A. Enhancing luminescence properties of lanthanide(iii)/pyrimidine-4,6-dicarboxylato system by solvent-free approach. Dalton Trans 2015; 44:6972-86. [DOI: 10.1039/c4dt03797a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Solvent-free reaction between lanthanide nitrates and pyrimidine-4,6-dicarboxylic acid led to 3D frameworks with coordinated nitrates showing a photoluminescence improvement and waveguiding behaviour.
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Affiliation(s)
- Javier Cepeda
- Department of Inorganic Chemistry
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
- Polymer Science & Technology Department
| | - Sonia Pérez-Yáñez
- Department of Inorganic Chemistry
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
| | - Garikoitz Beobide
- Department of Inorganic Chemistry
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
| | - Oscar Castillo
- Department of Inorganic Chemistry
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
| | - José Ángel García
- Department of Applied Physics
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
| | - Mónica Lanchas
- Department of Inorganic Chemistry
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
| | - Antonio Luque
- Department of Inorganic Chemistry
- University of the Basque Country UPV/EHU
- Bilbao
- Spain
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Ahmed N, Das C, Vaidya S, Srivastava AK, Langley SK, Murray KS, Shanmugam M. Probing the magnetic and magnetothermal properties of M(ii)–Ln(iii) complexes (where M(ii) = Ni or Zn; Ln(iii) = La or Pr or Gd). Dalton Trans 2014; 43:17375-84. [DOI: 10.1039/c4dt02360a] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the crystal structures of Ni(ii)–Ln(iii) (where Ln = Gd or Pr) complexes and their suitably substituted diamagnetic analogues. Magnetic characterization revealed the nature of the magnetic exchange interactions and the magnetothermal properties.
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Affiliation(s)
- Naushad Ahmed
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai, India-400076
| | - Chinmoy Das
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai, India-400076
| | - Shefali Vaidya
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai, India-400076
| | - Anant Kumar Srivastava
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Pune
- Pune, India-411008
| | | | | | - Maheswaran Shanmugam
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai, India-400076
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