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Grebenyuk D, Shaulskaya M, Shevchenko A, Zobel M, Tedeeva M, Kustov A, Sadykov I, Tsymbarenko D. Tuning the Cerium-Based Metal-Organic Framework Formation by Template Effect and Precursor Selection. ACS OMEGA 2023; 8:48394-48404. [PMID: 38144061 PMCID: PMC10733954 DOI: 10.1021/acsomega.3c07906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/14/2023] [Accepted: 11/17/2023] [Indexed: 12/26/2023]
Abstract
The novel metal-organic framework [(CH3)2NH2]2[Ce2(bdc)4(DMF)2]·2H2O (Ce-MOF, H2bdc-terephthalic acid, DMF-N,N-dimethylformamide) was synthesized by a simple solvothermal method. Ce-MOF has 3D connectivity of bcu type with a dinuclear fragment connected with eight neighbors, while three types of guest species are residing in its pores: water, DMF, and dimethylammonium cations. Dimethylamine was demonstrated to have a decisive templating effect on the formation of Ce-MOF, as its deliberate addition to the solvothermal reaction allows the reproducible synthesis of the new framework. Otherwise, the previously reported MOF Ce5(bdc)7.5(DMF)4 (Ce5) or its composite with nano-CeO2 (CeO2@Ce5) was obtained. Various Ce carboxylate precursors and synthetic conditions were explored to evidence the major stability of Ce-MOF and Ce5 within the Ce carboxylate-H2bdc-DMF system. The choice of precursor impacts the surface area of Ce-MOF and thus its reactivity in an oxidative atmosphere. The in situ PXRD and TG-DTA-MS study of Ce-MOF in a nonoxidative atmosphere demonstrates that it eliminates H2O and DMF along with (CH3)2NH guest species in two distinct stages at 70 and 250 °C, respectively, yielding [Ce2(bdc)3(H2bdc)]. The H2bdc molecule is removed at 350 °C with the formation of novel modification of Ce2(bdc)3, which is stable at least up to 450 °C. According to the total X-ray scattering study with pair distribution function analysis, the most pronounced local structure transformation occurs upon departure of DMF and (CH3)2NH guest species, which is in line with the in situ PXRD experiment. In an oxidative atmosphere, Ce-MOF undergoes combustion to CeO2 at a temperature as low as 390 °C. MOF-derived CeO2 from Ce-MOF, Ce5, and CeO2@Ce5 exhibits catalytic activity in the CO oxidation reaction.
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Affiliation(s)
- Dimitry Grebenyuk
- Lomonosov
Moscow State University, Moscow 119991, Russia
- Faculty
of Materials Science, MSU-BIT University, Shenzhen 518172, China
| | | | - Artem Shevchenko
- Lomonosov
Moscow State University, Moscow 119991, Russia
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Mirijam Zobel
- Institute
of Crystallography, RWTH Aachen University, Aachen 52066, Germany
| | - Marina Tedeeva
- Lomonosov
Moscow State University, Moscow 119991, Russia
| | - Alexander Kustov
- Lomonosov
Moscow State University, Moscow 119991, Russia
- N.
D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia
| | - Ilia Sadykov
- Paul
Scherrer
Institute, Villigen 5232, Switzerland
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Gashigullin R, Kendin M, Martynova I, Tsymbarenko D. Diverse Coordination Chemistry of the Whole Series Rare-Earth L-Lactates: Synthetic Features, Crystal Structure, and Application in Chemical Solution Deposition of Ln 2O 3 Thin Films. Molecules 2023; 28:5896. [PMID: 37570867 PMCID: PMC10421212 DOI: 10.3390/molecules28155896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/25/2023] [Accepted: 08/04/2023] [Indexed: 08/13/2023] Open
Abstract
Rare-earth (RE, Ln) carboxylates are widely studied as precursors of RE oxide-based nanomaterials; however, no systematic studies of RE L-lactates (HLact = 2-hydroxypropanoic acid) have been reported to date. In the present work, a profound structural investigation of RE L-lactates is carried out. A family of RE lactate complexes of the general formula LnLact3∙nH2O (Ln = La, Ce-Nd, Sm-Lu, Y; n = 2-3) are synthesized and characterized by CHN, TGA, and FTIR as well as by powder and single-crystal XRD methods.The existence of four novel structural types (1-Ln-4-Ln) is revealed. Compounds of the 1-Ln type (Ln = La, Ce, Pr) exhibit a chain polymeric structure, whereas 2-Ln-4-Ln compounds are molecular crystals consisting of dimeric (2-Ln; Ln = La, Ce-Nd) or monomeric (3-Ln-Ln = Sm-Lu, Y; 4-Ln-Ln = Sm-Gd, Y) species. The crystal structures of 1-Ln-4-Ln compounds are discussed in terms of their coordination geometry and supramolecular arrangement. Solutions of yttrium and lanthanum lactates with diethylenetriamine are applied for the chemical deposition of Y2O3 and La2O3 thin films.
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Affiliation(s)
- Ruslan Gashigullin
- Department of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Mikhail Kendin
- Department of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Irina Martynova
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Dmitry Tsymbarenko
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
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Xing J, Wang W, Huang S, Du M, Huang B, Liu Y, He S, Yao T, Li S, Liu Y. Effects of Grain Refinement and Thermal Aging on Atomic Scale Local Structures of Ultra-Fine Explosives by X-ray Total Scattering. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6835. [PMID: 36234175 PMCID: PMC9572120 DOI: 10.3390/ma15196835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
The atomic scale local structures affect the initiation performance of ultra-fine explosives according to the stimulation results of hot spot formation. However, the experimental characterization of local structures in ultra-fine explosives has been rarely reported, due to the difficulty in application of characterization methods having both high resolution in and small damage to unstable organic explosive materials. In this work, X-ray total scattering was explored to investigate the atomic scale local distortion of two widely applicable ultra-fine explosives, LLM-105 and HNS. The experimental spectra of atomic pair distribution function (PDF) derived from scattering results were fitted by assuming rigid ring structures in molecules. The effects of grain refinement and thermal aging on the atomic scale local structure were investigated, and the changes in both the length of covalent bonds have been identified. Results indicate that by decreasing the particle size of LLM-105 and HNS from hundreds of microns to hundreds of nanometers, the crystal structures remain, whereas the molecular configuration slightly changes and the degree of structural disorder increases. For example, the average length of covalent bonds in LLM-105 reduces from 1.25 Å to 1.15 Å, whereas that in HNS increases from 1.25 Å to 1.30 Å, which is possibly related to the incomplete crystallization process and internal stress. After thermal aging of ultra-fine LLM-105 and HNS, the degree of structural disorder decreases, and the distortion in molecules formed in the synthesis process gradually healed. The average length of covalent bonds in LLM-105 increases from 1.15 Å to 1.27 Å, whereas that in HNS reduces from 1.30 Å to 1.20 Å. The possible reason is that the atomic vibration in the molecule intensifies during the heat aging treatment, and the internal stress was released through changes in molecular configuration, and thus the atomic scale distortion gradually heals. The characterization method and findings in local structures obtained in this work may pave the path to deeply understand the relationship between the defects and performance of ultra-fine explosives.
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Affiliation(s)
- Jiangtao Xing
- College of Ordnance Engineering, Naval University of Engineering, Wuhan 430033, China
| | - Weili Wang
- College of Ordnance Engineering, Naval University of Engineering, Wuhan 430033, China
| | - Shiliang Huang
- China Academy of Engineering Physics, Institute of Chemical Materials, Mianyang 621900, China
| | - Maohua Du
- College of Ordnance Engineering, Naval University of Engineering, Wuhan 430033, China
| | - Bing Huang
- China Academy of Engineering Physics, Institute of Chemical Materials, Mianyang 621900, China
| | - Yousong Liu
- China Academy of Engineering Physics, Institute of Chemical Materials, Mianyang 621900, China
| | - Shanshan He
- China Academy of Engineering Physics, Institute of Chemical Materials, Mianyang 621900, China
| | - Tianle Yao
- Navy Research Institute, Beijing 100072, China
| | - Shichun Li
- China Academy of Engineering Physics, Institute of Chemical Materials, Mianyang 621900, China
| | - Yu Liu
- China Academy of Engineering Physics, Institute of Chemical Materials, Mianyang 621900, China
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Partially Ordered Lanthanide Carboxylates with a Highly Adaptable 1D Polymeric Structure. Polymers (Basel) 2022; 14:polym14163328. [PMID: 36015584 PMCID: PMC9414554 DOI: 10.3390/polym14163328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/08/2022] [Accepted: 08/12/2022] [Indexed: 11/17/2022] Open
Abstract
A new family of 14 isostructural [Ln(piv)3(en)]∞ lanthanide pivalate (piv−, 2,2-dimethylpropanoate) complexes with ethylenediamine (en) was synthesized by a topology-preserving transformation from 1D coordination polymers [Ln(piv)3]∞. The crystal structures of the compounds were determined by single-crystal and powder X-ray diffraction, which demonstrated that despite the regular ligand arrangement within the chains, the latter are intricately packed within the partially ordered crystal, as only two of four ligands are strictly bound by the translational symmetry. The peculiarities of the lanthanide coordination environment were explored by total X-ray scattering with pair distribution function analysis. Periodic DFT calculations revealed the chain stabilization by intrachain H-bonds and weak interchain interactions. Noticeably, the energy difference was infinitesimally small even between the two considered extreme variants of ordered packing, which is in line with the disturbed packing order of the chains. The luminescent properties of Eu and Tb complexes were investigated in order to prove the energy transfer between lanthanide ions within the heterometallic complex. This opens up the prospect of creating new materials for optical applications. The heterometallic compound Eu0.05Tb0.95(piv)3(en) was synthesized, and was found to demonstrate temperature-dependent luminescence with a linear dependence of the thermometric parameter I(Eu)/I(Tb) within the temperature range from −80 °C to 80 °C, and had a maximum relative sensitivity value of 0.2%/K.
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