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de Azevedo Santos L, van der Voort S, Burema SR, Fonseca Guerra C, Bickelhaupt FM. Blueshift in Trifurcated Hydrogen Bonds: A Tradeoff between Tetrel Bonding and Steric Repulsion. Chemphyschem 2024; 25:e202300480. [PMID: 37864778 DOI: 10.1002/cphc.202300480] [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: 08/04/2023] [Revised: 10/17/2023] [Accepted: 10/20/2023] [Indexed: 10/23/2023]
Abstract
We have quantum chemically investigated the origin of the atypical blueshift of the H-C bond stretching frequency in the hydrogen-bonded complex X- •••H3 C-Y (X, Y=F, Cl, Br, I), as compared to the corresponding redshift occurring in Cl- •••H3 N and Cl- •••H3 C-H, using relativistic density functional theory (DFT) at ZORA-BLYP-D3(BJ)/QZ4P. Previously, this blueshift was attributed, among others, to the contraction of the H-C bonds as the H3 C moiety becomes less pyramidal. Herein, we provide quantitative evidence that, instead, the blueshift arises from a direct and strong X- •••C interaction of the HOMO of A- with the backside lobe on carbon of the low-lying C-Y antibonding σ* LUMO of the H3 C-Y fragment. This X- •••C bond, in essence a tetrel bond, pushes the H atoms towards a shorter H-C distance and makes the H3 C moiety more planar. The blueshift may, therefore, serve as a diagnostic for tetrel bonding.
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Affiliation(s)
- Lucas de Azevedo Santos
- Department of Chemistry and Pharmaceutical Sciences, AIMMS, Vrije Universiteit, Amsterdam, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands
| | - Storm van der Voort
- Department of Chemistry and Pharmaceutical Sciences, AIMMS, Vrije Universiteit, Amsterdam, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands
| | - Shiri R Burema
- Department of Chemistry and Pharmaceutical Sciences, AIMMS, Vrije Universiteit, Amsterdam, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands
| | - Célia Fonseca Guerra
- Department of Chemistry and Pharmaceutical Sciences, AIMMS, Vrije Universiteit, Amsterdam, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands
| | - F Matthias Bickelhaupt
- Department of Chemistry and Pharmaceutical Sciences, AIMMS, Vrije Universiteit, Amsterdam, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
- Department of Chemical Sciences, University of Johannesburg Auckland Park, Johannesburg, 2006, South Africa
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2
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Łukaszewska I, Bukowczan A, Raftopoulos KN, Pielichowski K. Examining the Water-Polymer Interactions in Non-Isocyanate Polyurethane/Polyhedral Oligomeric Silsesquioxane Hybrid Hydrogels. Polymers (Basel) 2023; 16:57. [PMID: 38201722 PMCID: PMC10780322 DOI: 10.3390/polym16010057] [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: 11/30/2023] [Revised: 12/19/2023] [Accepted: 12/20/2023] [Indexed: 01/12/2024] Open
Abstract
Non-isocyanate polyurethane (NIPU) networks physically modified with octa(3-hydroxy-3-methylbutyldimethylsiloxy)POSS (8OHPOSS, 0-10 wt%) were conditioned in environments of different relative humidities (up to 97%) to study water-polymer interactions. The equilibrium sorption isotherms are of Brunauer type III in a water activity range of 0-0.97 and are discussed in terms of the Guggenheim (GAB) sorption model. The study shows that the introduction of 8OHPOSS, even in a large amount (10 wt%), does not hinder the water affinity of the NIPU network despite the hydrophobic nature of POSS; this is attributable to the homogenous dispersion of POSS in the polymer matrix. The shift in the urethane-derived carbonyl bands toward lower wavenumbers with a simultaneous shift in the urethane N-H bending bands toward higher wavenumbers exposes the breakage of polymer-polymer hydrogen bonds upon water uptake due to the formation of stronger water-polymer hydrogen bonds. Upon water absorption, a notable decrease in the glass transition temperature (Tg) is observed for all studied materials. The progressive reduction in Tg with water uptake is driven by plasticization and slaving mechanisms. POSS moieties are thought to impact slaving indirectly by slightly affecting water uptake at very high hydration levels.
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Affiliation(s)
- Izabela Łukaszewska
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland; (A.B.); (K.N.R.)
| | | | | | - Krzysztof Pielichowski
- Department of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland; (A.B.); (K.N.R.)
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3
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Hernández HM, Sun Q, Rosati M, Gieseking RLM, Johnson CJ. Bonding and Acidity of the Formal Hydride in the Prototypical Au 9 (PPh 3 ) 8 H 2+ Nanocluster. Angew Chem Int Ed Engl 2023; 62:e202307723. [PMID: 37419865 DOI: 10.1002/anie.202307723] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/05/2023] [Accepted: 07/07/2023] [Indexed: 07/09/2023]
Abstract
The role of hydrogen atoms as surface ligands on metal nanoclusters is of profound importance but remains difficult to directly study. While hydrogen atoms often appear to be incorporated formally as hydrides, evidence suggests that they donate electrons to the cluster's delocalized superatomic orbitals and may consequently behave as acidic protons that play key roles in synthetic or catalytic mechanisms. Here we directly test this assertion for the prototypical Au9 (PPh3 )8 H2+ nanocluster, formed by addition of a hydride to the well-characterized Au9 (PPh3 )8 3+ . Using gas-phase infrared spectroscopy, we were able to unambiguously isolate Au9 (PPh3 )8 H2+ and Au9 (PPh3 )8 D2+ , revealing an Au-H stretching mode at 1528 cm-1 that shifts to 1038 cm-1 upon deuteration. This shift is greater than the maximum expected for a typical harmonic potential, suggesting a potential governing cluster-H bonding that has some square-well character consistent with the hydrogen nucleus behaving as a metal atom in the cluster core. Complexing this cluster with very weak bases reveals a redshift of 37 cm-1 in the Au-H vibration, consistent with those typically seen for moderately acidic groups in gas phase molecules and providing an estimate of the acidity of Au9 (PPh3 )8 H2+ , at least with regard to its surface reactivity.
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Affiliation(s)
- Hanna Morales Hernández
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, NY 11794, USA
| | - Qiwei Sun
- Department of Chemistry, Brandeis University, 415 South St., Waltham, MA 02453, USA
| | - Matthew Rosati
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, NY 11794, USA
| | | | - Christopher J Johnson
- Department of Chemistry, Stony Brook University, 100 Nicolls Rd., Stony Brook, NY 11794, USA
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4
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Liu X, Chen X, Zhang L, Twum KJ, Wang X, Xu Y, Zeng X. Crystalline silica particle functionalized by PEG for its collision-enhanced detection at ultramicroelectrode. Anal Chim Acta 2023; 1260:341178. [PMID: 37121651 DOI: 10.1016/j.aca.2023.341178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/27/2023] [Accepted: 04/05/2023] [Indexed: 05/02/2023]
Abstract
Detecting individual particulate matter is highly significant in many areas, such as mine safety, environment, and human health. The analytical method based on single entity electrochemistry (SEE) has shown great potential in detecting, counting, and measuring individual particles, especially conductive metals or carbon particles, based on their unique charge transfer reactions at an ultramicroelectrode (UME). In this study, we report an innovative SEE method for improving the sensitivity of the detection of electrochemical inert crystalline silica particles by functionalizing silica particles with polyethylene glycol (PEG) molecules. The PEG surface functionalization of the silica was characterized by Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) techniques. The morphology of silica particles was characterized by a scanning electron microscope (SEM), and a transmission electron microscope (TEM) was employed to calibrate size distribution and determine the elemental composition of silica particles. The surface charges of silica particles were measured by dynamic light scattering techniques. The collision behaviors of crystalline silica particles with UME were investigated by cyclic voltammetric experiments, which are rarely reported in the literature. The crystalline silica particles were detected based on electrochemically blocking the flux of the redox mediator at the surface of UME, which showed significant signal amplification in the proposed method. Our method was demonstrated for detecting crystalline silica functionalized with or without PEG, acquiring the limit of quantification (LOQ) values of 0.391 μM (23.45 μg/L) and 0.824 μM (49.45 μg/L), respectively, which confirmed that a more than two times improvement in LOQ could be achieved over the PEG functionalized silica particles. We further presented a theoretical model using finite element simulations with COMSOL Multiphysics. We deduced a quantitative relation between the distribution of the current step size and the size distribution of silica particles. Therefore, the reported method here provides a paradigm for SEE-based detection of electrochemically inert crystalline silica particles, which extends the previous report substantially concerning particle detection.
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Affiliation(s)
- Xiaojun Liu
- Department of Chemistry, Oakland University, Rochester Hills, MI, 48309, USA
| | - Xiaoyu Chen
- College of Engineering, Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI, 48202, USA
| | - Lei Zhang
- Department of Mechanical Engineering, Oakland University, Rochester Hills, MI, 48309, USA
| | - Kwaku Junior Twum
- Department of Chemistry, Oakland University, Rochester Hills, MI, 48309, USA
| | - Xia Wang
- Department of Mechanical Engineering, Oakland University, Rochester Hills, MI, 48309, USA
| | - Yong Xu
- College of Engineering, Department of Electrical and Computer Engineering, Wayne State University, Detroit, MI, 48202, USA
| | - Xiangqun Zeng
- Department of Chemistry, Oakland University, Rochester Hills, MI, 48309, USA.
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Two Facile Aniline-Based Hypercrosslinked Polymer Adsorbents for Highly Efficient Iodine Capture and Removal. Int J Mol Sci 2022; 24:ijms24010370. [PMID: 36613814 PMCID: PMC9820307 DOI: 10.3390/ijms24010370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/20/2022] [Accepted: 12/23/2022] [Indexed: 12/28/2022] Open
Abstract
Effective capture and safe disposal of radioactive iodine (129I or 131I) during nuclear power generation processes have always been a worldwide environmental concern. Low-cost and high-efficiency iodine removal materials are urgently needed. In this study, we synthesized two aniline-based hypercrosslinked polymers (AHCPs), AHCP-1 and AHCP-2, for iodine capture in both aqueous and gaseous phases. They are obtained by aniline polymerization through Friedel-Crafts alkylation and Scholl coupling reaction, respectively, with high chemical and thermal stability. Notably, AHCP-1 exhibits record-high static iodine adsorption (250 wt%) in aqueous solution. In the iodine vapor adsorption, AHCP-2 presents an excellent total iodine capture (596 wt%), surpassing the most reported amorphous polymer adsorbents. The rich primary amine groups of AHCPs promote the rapid physical capture of iodine from iodine water and iodine vapor. Intrinsic features such as low-cost preparation, good recyclability, as well as excellent performance in iodine capture indicate that the AHCPs can be used as potential candidates for the removal of iodine from radioactive wastewater and gas mixtures.
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Maltol-Incorporated Acetylated Cassava Starch Films for Shelf-Life-Extension Packaging of Bakery Products. Polymers (Basel) 2022; 14:polym14245342. [PMID: 36559709 PMCID: PMC9782678 DOI: 10.3390/polym14245342] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/02/2022] [Accepted: 12/04/2022] [Indexed: 12/12/2022] Open
Abstract
Maltol is widely used as a flavor enhancer in baked goods and has an antimicrobial function. Maltol can also be incorporated into biopolymer films to produce active biodegradable packaging for bakery products. This research investigated the incorporation of 1-10% maltol into acetylated cassava starch films as functional packaging for shelf-life extension of butter cake. Films were determined for morphology, chemical interaction and packaging properties. Infrared absorption indicated H-bonding between starch and maltol, while plasticization effects decreased mechanical relaxation temperature. Microstructures showed enhanced smoothness at up to 3% maltol, while maltol crystallization occurred at higher concentrations, giving non-homogeneous matrices. Tensile strength and elongation at break reduced by 37% and 34%, respectively, with the addition of maltol up to 10%. Maltol concentration modified the hydrophilicity and molecular mobility of the matrices, impacting water vapor and oxygen permeability. Films incorporated with maltol were used as packaging for preservative-free butter cake and delayed visible mold growth at room temperature. Starch films with maltol at 1-5% delayed fungal growth by up to 2.7-times, while films containing 10% maltol inhibited mold growth by 6-times (up to 19 days of storage). Incorporating maltol into starch films produced bioactive materials, extending shelf-life while maintaining the aroma of bakery products.
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Uyguner-Demirel CS, Turkten N, Kaya D, Bekbolet M. Effect of oxidative and non-oxidative conditions on molecular size fractionation of humic acids: TiO 2 and Cu-doped TiO 2 photocatalysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:85413-85432. [PMID: 35790638 DOI: 10.1007/s11356-022-21754-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/26/2022] [Indexed: 06/15/2023]
Abstract
Natural waters contain some carbonaceous materials referred to as dissolved organic matter, which is mainly composed of humic acids (HA). Owing to its polydispersed character related to the presence of diverse molecular size fractions (< 450 kDa to even < 1 kDa), HA displays curious reactivity in natural waters and during water treatment train. In this study, a system-based stepwise approach was tracked by characterizing HA following photolysis, adsorptive interactions, and solar photocatalysis using bare TiO2, sol-gel prepared TiO2, and their respective Cu-doped specimens complementary to kinetic evaluation on this respect. For this purpose, prior to and following each treatment, HA was monitored by dissolved organic carbon content, UV-vis parameters, and fluorescence features. Attenuated total reflection Fourier transform infrared (FTIR), surface-enhanced Raman scattering spectroscopy (SERS), XRD, SEM, EDAX XPS, and DRS were used to characterize the materials and solutions reported in this study. Most significant quantitative variations were attained in UV-vis spectroscopic parameters along with fluorescence characteristics; however, infrared and Raman profiles displayed slight deviations in qualitative measures. Differentiation between the selected photocatalyst specimens could be visualized through molecular size effects pointing out the significance of HA 10 kDa fraction. For the first time, this study reports the degradation of specific fractions of HA as a function of their molecular size fraction. Cu-TiO2 seems to photocatalyze more effectively the degradation of the diverse HA fractions due to their more extended absorption of solar light by this photocatalyst.
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Affiliation(s)
| | - Nazli Turkten
- Department of Chemistry, Faculty of Arts and Sciences, Kirsehir Ahi Evran University, Kirsehir, 40100, Turkey
| | - Dila Kaya
- Department of Chemistry, Faculty of Engineering and Natural Sciences, Istanbul Medeniyet University, Istanbul, 34700, Turkey
| | - Miray Bekbolet
- Institute of Environmental Sciences, Bogazici University, Bebek, Istanbul, 34342, Turkey
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8
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Cho K, Tarté R, Acevedo NC. Development and characterization of the freeze-thaw and oxidative stability of edible rice bran wax-gelatin biphasic gels. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.114330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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9
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Du K, Zhang L, Shan J, Guo J, Mao J, Yang CC, Wang CH, Hu Z, Ling T. Interface engineering breaks both stability and activity limits of RuO2 for sustainable water oxidation. Nat Commun 2022; 13:5448. [PMID: 36114207 PMCID: PMC9481627 DOI: 10.1038/s41467-022-33150-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 09/06/2022] [Indexed: 11/18/2022] Open
Abstract
Designing catalytic materials with enhanced stability and activity is crucial for sustainable electrochemical energy technologies. RuO2 is the most active material for oxygen evolution reaction (OER) in electrolysers aiming at producing ‘green’ hydrogen, however it encounters critical electrochemical oxidation and dissolution issues during reaction. It remains a grand challenge to achieve stable and active RuO2 electrocatalyst as the current strategies usually enhance one of the two properties at the expense of the other. Here, we report breaking the stability and activity limits of RuO2 in neutral and alkaline environments by constructing a RuO2/CoOx interface. We demonstrate that RuO2 can be greatly stabilized on the CoOx substrate to exceed the Pourbaix stability limit of bulk RuO2. This is realized by the preferential oxidation of CoOx during OER and the electron gain of RuO2 through the interface. Besides, a highly active Ru/Co dual-atom site can be generated around the RuO2/CoOx interface to synergistically adsorb the oxygen intermediates, leading to a favourable reaction path. The as-designed RuO2/CoOx catalyst provides an avenue to achieve stable and active materials for sustainable electrochemical energy technologies. RuO2 encounters critical electrochemical dissolution issues during oxygen evolution reaction and it remains a grand challenge to achieve stable and active RuO2 electrocatalyst. Here, the authors report breaking stability and activity limits of RuO2 by constructing a RuO2/CoOx interface.
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10
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Synthesis, structural characterization, therotical and electrical properties of novel sulpho-coumarin based methacrylate polymer. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03034-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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11
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Klimek K, Benko A, Vandrovcova M, Travnickova M, Douglas TEL, Tarczynska M, Broz A, Gaweda K, Ginalska G, Bacakova L. Biomimetic biphasic curdlan-based scaffold for osteochondral tissue engineering applications - Characterization and preliminary evaluation of mesenchymal stem cell response in vitro. BIOMATERIALS ADVANCES 2022; 135:212724. [PMID: 35929204 DOI: 10.1016/j.bioadv.2022.212724] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 02/15/2022] [Accepted: 02/18/2022] [Indexed: 06/15/2023]
Abstract
Osteochondral defects remain a huge problem in medicine today. Biomimetic bi- or multi-phasic scaffolds constitute a very promising alternative to osteochondral autografts and allografts. In this study, a new curdlan-based scaffold was designed for osteochondral tissue engineering applications. To achieve biomimetic properties, it was enriched with a protein component - whey protein isolate as well as a ceramic ingredient - hydroxyapatite granules. The scaffold was fabricated via a simple and cost-efficient method, which represents a significant advantage. Importantly, this technique allowed generation of a scaffold with two distinct, but integrated phases. Scanning electron microcopy and optical profilometry observations demonstrated that phases of biomaterial possessed different structural properties. The top layer of the biomaterial (mimicking the cartilage) was smoother than the bottom one (mimicking the subchondral bone), which is beneficial from a biological point of view because unlike bone, cartilage is a smooth tissue. Moreover, mechanical testing showed that the top layer of the biomaterial had mechanical properties close to those of natural cartilage. Although the mechanical properties of the bottom layer of scaffold were lower than those of the subchondral bone, it was still higher than in many analogous systems. Most importantly, cell culture experiments indicated that the biomaterial possessed high cytocompatibility towards adipose tissue-derived mesenchymal stem cells and bone marrow-derived mesenchymal stem cells in vitro. Both phases of the scaffold enhanced cell adhesion, proliferation, and chondrogenic differentiation of stem cells (revealing its chondroinductive properties in vitro) as well as osteogenic differentiation of these cells (revealing its osteoinductive properties in vitro). Given all features of the novel curdlan-based scaffold, it is worth noting that it may be considered as promising candidate for osteochondral tissue engineering applications.
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Affiliation(s)
- Katarzyna Klimek
- Medical University of Lublin, Chair and Department of Biochemistry and Biotechnology, Chodzki 1 Street, 20-093 Lublin, Poland.
| | - Aleksandra Benko
- AGH University of Science and Technology, Faculty of Materials Science and Ceramics, 30 A. Mickiewicza Av., 30-059 Krakow, Poland
| | - Marta Vandrovcova
- Institute of Physiology of the Czech Academy of Sciences, Laboratory of Biomaterials and Tissue Engineering, Videnska 1083 Street, 14220 Prague, Czech Republic
| | - Martina Travnickova
- Institute of Physiology of the Czech Academy of Sciences, Laboratory of Biomaterials and Tissue Engineering, Videnska 1083 Street, 14220 Prague, Czech Republic
| | - Timothy E L Douglas
- Engineering Department, Lancaster University, Gillow Avenue, LA1 4YW Lancaster, United Kingdom; Materials Science Institute (MSI), Lancaster University, Lancaster, United Kingdom
| | - Marta Tarczynska
- Medical University of Lublin, Department and Clinic of Orthopaedics and Traumatology, Jaczewskiego 8 Street, 20-090 Lublin, Poland
| | - Antonin Broz
- Institute of Physiology of the Czech Academy of Sciences, Laboratory of Biomaterials and Tissue Engineering, Videnska 1083 Street, 14220 Prague, Czech Republic
| | - Krzysztof Gaweda
- Medical University of Lublin, Department and Clinic of Orthopaedics and Traumatology, Jaczewskiego 8 Street, 20-090 Lublin, Poland
| | - Grazyna Ginalska
- Medical University of Lublin, Chair and Department of Biochemistry and Biotechnology, Chodzki 1 Street, 20-093 Lublin, Poland
| | - Lucie Bacakova
- Institute of Physiology of the Czech Academy of Sciences, Laboratory of Biomaterials and Tissue Engineering, Videnska 1083 Street, 14220 Prague, Czech Republic
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Chuasaard T, Thammakan S, Semakul N, Konno T, Rujiwatra A. Structure and photoluminescence of two-dimensional lanthanide coordination polymers of mixed phthalate and azobenzene dicarboxylate. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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13
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Fan Y, Luo H, Zhu C, Li W, Wu D, Wu H. Hydrophobic natural alcohols based deep eutectic solvents: Effective solvents for the extraction of quinine. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119112] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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14
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de Azevedo Santos L, Cesario D, Vermeeren P, van der Lubbe SCC, Nunzi F, Fonseca Guerra C. σ-Electrons Responsible for Cooperativity and Ring Equalization in Hydrogen-Bonded Supramolecular Polymers. Chempluschem 2021; 87:e202100436. [PMID: 34709769 DOI: 10.1002/cplu.202100436] [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: 09/29/2021] [Revised: 10/18/2021] [Indexed: 11/08/2022]
Abstract
We have quantum chemically analyzed the cooperative effects and structural deformations of hydrogen-bonded urea, deltamide, and squaramide linear chains using dispersion-corrected density functional theory at BLYP-D3(BJ)/TZ2P level of theory. Our purpose is twofold: (i) reveal the bonding mechanism of the studied systems that lead to their self-assembly in linear chains; and (ii) rationalize the C-C bond equalization in the ring moieties of deltamide and squaramide upon polymerization. Our energy decomposition and Kohn-Sham molecular orbital analyses reveal cooperativity in all studied systems, stemming from the charge separation within the σ-electronic system by charge transfer from the carbonyl oxygen lone pair donor orbital of one monomer towards the σ* N-H antibonding acceptor orbital of the neighboring monomer. This key orbital interaction causes the C=O bonds to elongate, which, in turn, results in the contraction of the adjacent C-C single bonds that, ultimately, makes the ring moieties of deltamide and squaramide to become more regular. Notably, the π-electron delocalization plays a much smaller role in the total interaction between the monomers in the chain.
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Affiliation(s)
- Lucas de Azevedo Santos
- Department of Theoretical Chemistry, Amsterdam Institute for Molecular and Life Sciences (AIMMS) Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081, HV Amsterdam, The Netherlands
| | - Diego Cesario
- Department of Theoretical Chemistry, Amsterdam Institute for Molecular and Life Sciences (AIMMS) Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081, HV Amsterdam, The Netherlands
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, I-06123, Perugia, Italy
| | - Pascal Vermeeren
- Department of Theoretical Chemistry, Amsterdam Institute for Molecular and Life Sciences (AIMMS) Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081, HV Amsterdam, The Netherlands
| | - Stephanie C C van der Lubbe
- Department of Theoretical Chemistry, Amsterdam Institute for Molecular and Life Sciences (AIMMS) Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081, HV Amsterdam, The Netherlands
| | - Francesca Nunzi
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, I-06123, Perugia, Italy
- Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (CNR-SCITEC), Via Elce di Sotto 8, 06123, Perugia, Italy
| | - Célia Fonseca Guerra
- Department of Theoretical Chemistry, Amsterdam Institute for Molecular and Life Sciences (AIMMS) Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081, HV Amsterdam, The Netherlands
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, Einsteinweg 55, 2333, CC Leiden, The Netherlands
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15
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Mahani M, Mahmoudi F, Fassihi J, Hasani Z, Divsar F. Carbon dots-embedded N-acetylneuraminic acid and glucuronic acid-imprinted polymers for targeting and imaging of cancer cells. Mikrochim Acta 2021; 188:224. [PMID: 34101046 DOI: 10.1007/s00604-021-04876-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 05/25/2021] [Indexed: 11/26/2022]
Abstract
Diagnosis, treatment, and prediction of cancer progression require new targeting agents to specifically target cell surface receptors. Herein, we demonstrated fluorescent carbon quantum dots-molecularly imprinted polymer (CQD-MIP) for selective targeting and imaging of cancer cells. Carbon quantum dots (CQDs) were synthesized and characterized. The synthesized CQDs had average size of 1.5 nm and show intense fluorescence emission at wavelength of 450 nm with excitation at 370 nm. CQD-MIP nanoparticles imprinted with N-acetylneuraminic acid and glucuronic acid were prepared and characterized. CQD-MIPs were successfully applied for selective targeting and imaging of MCF-7, HepG-2, and NIH-3T3 cell lines. Non-imprinted polymer (NIP) showed no binding properties toward a target molecule. Non-imprinted polymer (NIP) and non-cancerous human cell lines were used for controlling the imprinting and targeting effects, respectively. Acceptable results were obtained with imprinted polymers on cancer cells.
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Affiliation(s)
- Mohamad Mahani
- Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Graduate University of Advanced Technology, Kerman, 7631818356, Iran.
| | - Firouze Mahmoudi
- Department of Nanotechnology, Faculty of Sciences and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran
| | | | - Zahra Hasani
- Department of New Materials, Institute of Science, High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, 7631133131, Iran
| | - Faten Divsar
- Department of Chemistry, Payame Noor University, PO BOX 19395-3697, Tehran, Iran
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Nguyen TN, Rangel A, Grainger DW, Migonney V. Influence of spin finish on degradation, functionalization and long-term storage of polyethylene terephthalate fabrics dedicated to ligament prostheses. Sci Rep 2021; 11:4258. [PMID: 33608601 PMCID: PMC7895958 DOI: 10.1038/s41598-021-83572-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 02/01/2021] [Indexed: 11/29/2022] Open
Abstract
Polyethylene terephthalate (PET) fibers and fabrics are widely used for medical device applications such as vascular and anterior cruciate ligament prostheses. Several years ago, we began functionalizing PET fabrics using anionic polymers to enhance their biocompatibility, cell adhesion, proliferation and functional performance as PET ligament prostheses. Polymer functionalization followed a grafting-from process from virgin PET surfaces subject to spin-finish oil additive removal under Soxhlet extraction to remove residual fiber manufacturing oil. Nevertheless, with increasing time from manufacture, PET fabrics stored without a spin finish removal step exhibited degradation of spin finish oil, leading to (1) incomplete surface cleaning, and (2) PET surface degradation. Moreover, oxidizing agents present in the residual degraded oil prevented reliable functionalization of the prosthesis fibers in these PET fabrics. This study compares effects of PET fabric/spin finish oil storage on PET fabric anionic polymer functionalization across two PET fabric ligament storage groups: (1) 2- and 10- year old ligaments, and (2) 26-year old ligaments. Strong interactions between degraded spin finish oil and PET fiber surfaces after long storage times were demonstrated via extraction yield; oil chemistry changed assessed by spectral analysis. Polymer grafting/functionalization efficiency on stored PET fabrics was correlated using atomic force microscopy, including fiber surface roughness and relationships between grafting degree and surface Young’s modulus. New PET fabric Young’s modulus significantly decreased by anionic polymer functionalization (to 96%, grafting degree 1.6 µmol/g) and to reduced modulus and efficiency (29%) for 10 years storage fabric (grafting degree ~ 1 µmol/g). As fiber spin finish is mandatory in biomedically applicable fiber fabrication, assessing effects of spin finish oil on commercial polymer fabrics after longer storage under various conditions (UV light, temperature) is necessary to understand possible impacts on fiber degradation and surface functionalization.
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Affiliation(s)
- Tuan Ngoc Nguyen
- Chemistry, Structures and Properties of Biomaterials and Therapeutic Agents Laboratory, LBPS-CSPBAT, UMR CNRS 7244, Université Sorbonne Paris Nord, Villetaneuse, France
| | - Andre Rangel
- Chemistry, Structures and Properties of Biomaterials and Therapeutic Agents Laboratory, LBPS-CSPBAT, UMR CNRS 7244, Université Sorbonne Paris Nord, Villetaneuse, France
| | - David W Grainger
- Department of Biomedical Engineering, and Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Véronique Migonney
- Chemistry, Structures and Properties of Biomaterials and Therapeutic Agents Laboratory, LBPS-CSPBAT, UMR CNRS 7244, Université Sorbonne Paris Nord, Villetaneuse, France.
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17
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Rangel A, Nguyen TN, Egles C, Migonney V. Different real‐time degradation scenarios of functionalized poly(ε‐caprolactone) for biomedical applications. J Appl Polym Sci 2021. [DOI: 10.1002/app.50479] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- André Rangel
- Laboratoire de Biomatériaux pour la Santé (LBPS), Laboratoire de Chimie Structures, Proprietés de Biomateriaux et d'Agents Thérapeutiques (CSPBAT), UMR CNRS 7244, Université Sorbonne Paris Nord Villetaneuse France
| | - Tuan Ngoc Nguyen
- Laboratoire de Biomatériaux pour la Santé (LBPS), Laboratoire de Chimie Structures, Proprietés de Biomateriaux et d'Agents Thérapeutiques (CSPBAT), UMR CNRS 7244, Université Sorbonne Paris Nord Villetaneuse France
| | - Christophe Egles
- BioMécanique et BioIngénierie (BMBI) Alliance Sorbonne université, Université de Technologie de Compiègne, CNRS, UMR 7338 , Centre de recherche Royallieu Compiègne cedex France
| | - Véronique Migonney
- Laboratoire de Biomatériaux pour la Santé (LBPS), Laboratoire de Chimie Structures, Proprietés de Biomateriaux et d'Agents Thérapeutiques (CSPBAT), UMR CNRS 7244, Université Sorbonne Paris Nord Villetaneuse France
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18
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Sruthi PK, Chandra S, Ramanathan N, Sundararajan K. Unusual blue to red shifting of C-H stretching frequency of CHCl 3 in co-operatively P⋯Cl phosphorus bonded POCl 3-CHCl 3 heterodimers at low temperature inert matrixes. J Chem Phys 2020; 153:174305. [PMID: 33167652 DOI: 10.1063/5.0031162] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Heterodimers of POCl3-CHCl3 were generated in Ne, Ar, and Kr matrixes at low temperatures and were studied using infrared spectroscopy. The remarkable role of co-operative pentavalent phosphorus bonding in the stabilization of the structure dictated by hydrogen bonding is deciphered. The complete potential energy surface of the heterodimer was scanned by ab initio and density functional theory computational methodologies. The hydrogen bond between the phosphoryl oxygen of POCl3 and C-H group of CHCl3 in heterodimers induces a blue-shift in the C-H stretching frequency within the Ne matrix. However, in Ar and Kr matrixes, the C-H stretching frequency is exceptionally red-shifted in stark contrast with Ne. The plausibility of the Fermi resonance by the C-H stretching vibrational mode with higher order modes in the heterodimers has been eliminated as a possible cause within Ar and Kr matrixes by isotopic substitution (CDCl3) experiments. To evaluate the influence of matrixes as a possible cause of red-shift, self-consistent Iso-density polarized continuum reaction field model was applied. This conveyed the important role of the dielectric matrixes in inducing the fascinating vibrational shift from blue (Ne) to red (Ar and Kr) due to the matrix specific transmutation of the POCl3-CHCl3 structure. The heterodimer produced in the Ne matrix possesses a cyclic structure stabilized by hydrogen bonding with co-operative phosphorus bonding, while in Ar and Kr the generation of an acyclic open structure stabilized solely by hydrogen bonding is promoted. Compelling justification regarding the dispersion force based influence of matrix environments in addition to the well-known dielectric influence is presented.
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Affiliation(s)
- P K Sruthi
- Homi Bhabha National Institute, Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - Swaroop Chandra
- Homi Bhabha National Institute, Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - N Ramanathan
- Homi Bhabha National Institute, Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - K Sundararajan
- Homi Bhabha National Institute, Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
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Santos GFN, Carvalho LC, Oliveira DAS, Rego DG, Bueno MA, Oliveira BG. The definitive challenge of forming uncommon pseudo‐π···H–F and C···H–F hydrogen bonds on cyclic and cubic nonpolar hydrocarbons. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Leila Cardoso Carvalho
- Centro das Ciências Exatas e das Tecnologias Universidade Federal do Oeste da Bahia Barreiras Brazil
| | | | - Danilo Guimarães Rego
- Centro das Ciências Exatas e das Tecnologias Universidade Federal do Oeste da Bahia Barreiras Brazil
| | - Mauro Alves Bueno
- Centro das Ciências Exatas e das Tecnologias Universidade Federal do Oeste da Bahia Barreiras Brazil
| | - Boaz Galdino Oliveira
- Centro das Ciências Exatas e das Tecnologias Universidade Federal do Oeste da Bahia Barreiras Brazil
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20
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Bhattacharya I, Sadhukhan J, Biswas S, Chakraborty T. Medium-Dependent Crossover from the Red to Blue Shift of the Donor’s Stretching Fundamental in the Binary Hydrogen-Bonded Complexes of CDCl3 with Ethers and Ketones. J Phys Chem A 2020; 124:7259-7270. [DOI: 10.1021/acs.jpca.0c03946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Indrani Bhattacharya
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Jayshree Sadhukhan
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
- Department of Chemistry, Govt. General Degree College, Singur, Hooghly 712409, West Bengal, India
| | - Souvick Biswas
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Tapas Chakraborty
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
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21
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Xu L, Zhang Y, Pan H, Xu N, Mei C, Mao H, Zhang W, Cai J, Xu C. Preparation and Performance of Radiata-Pine-Derived Polyvinyl Alcohol/Carbon Quantum Dots Fluorescent Films. MATERIALS 2019; 13:ma13010067. [PMID: 31877792 PMCID: PMC6981502 DOI: 10.3390/ma13010067] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/09/2019] [Accepted: 12/19/2019] [Indexed: 11/16/2022]
Abstract
In this study, the low-cost processing residue of Radiata pine (Pinus radiata D. Don) was used as the lone carbon source for synthesis of CQDs (Carbon quantum dots) with a QY (The quantum yield of the CQDs) of 1.60%. The CQDs were obtained by the hydrothermal method, and +a PVA-based biofilm was prepared by the fluidized drying method. The effects of CQDs and CNF (cellulose nanofibers) content on the morphology, optical, mechanical, water-resistance, and wettability properties of the PVA/CQDs and PVA/CNF/CQDs films are discussed. The results revealed that, when the excitation wavelength was increased from 340 to 390 nm, the emission peak became slightly red-shifted, which was induced by the condensation between CQDs and PVA. The PVA composite films showed an increase in fluorescence intensity with the addition of the CNF and CQDs to polymers. The chemical structure of prepared films was determined by the FTIR spectroscopy, and no new chemical bonds were formed. In addition, the UV transmittance was inversely proportional to the change of CQDs content, which indicated that CQDs improved the UV barrier properties of the films. Furthermore, embedding CQDs Nano-materials and CNF into the PVA matrix improved the mechanical behavior of the Nano-composite. Tensile modulus and strength at break increased significantly with increasing the concentration of CQDs Nano-materials inside the Nano-composite, which was due to the increased in the density of crosslinking behavior. With the increase of CQDs content (>1 mL), the water absorption and surface contact angle of the prepared films decreased gradually, and the water-resistance and surface wettability of the films were improved. Therefore, PVA/CNF/CQDs bio-nanocomposite films could be used to prepare anti-counterfeiting, high-transparency, and ultraviolet-resistant composites, which have potential applications in ecological packaging materials.
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Affiliation(s)
- Li Xu
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
- Correspondence: (L.X.); (C.X.); Tel.: +86-0258-542-7519 (C.X.)
| | - Yushu Zhang
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
| | - Haiqing Pan
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
| | - Nan Xu
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
| | - Changtong Mei
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
| | - Haiyan Mao
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
- Jiangsu Chenguang Coating Co., Ltd., Changzhou 213164, China
| | - Wenqing Zhang
- Jiangsu Province Taizhou Efficient Processing Engineering Technology Research Center for Radiata Pine, Taizhou 214500, China;
| | - Jiabin Cai
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
| | - Changyan Xu
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; (Y.Z.); (H.P.); (N.X.); (C.M.); (H.M.); (J.C.)
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
- Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, China
- Correspondence: (L.X.); (C.X.); Tel.: +86-0258-542-7519 (C.X.)
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Mao Y, Head-Gordon M. Probing Blue-Shifting Hydrogen Bonds with Adiabatic Energy Decomposition Analysis. J Phys Chem Lett 2019; 10:3899-3905. [PMID: 31241961 DOI: 10.1021/acs.jpclett.9b01203] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The physical origin of blue-shifting hydrogen bonds remains a subject of debate, although many plausible explanations have been proposed. Using a molecular property decomposition analysis based on absolutely localized molecular orbitals, we investigated several representative F3CH···Y (Y = H2O, NH3, Cl-) complexes. We reveal that features of a blue-shifting H-bond already appear on the frozen surface where both polarization and charge transfer (CT) are "turned off", and that the final frequency shift observed depends on the strength of CT. Further decomposition of forces at the frozen level shows that Pauli repulsion is the only component that shortens the C-H bond in the short-range, while both permanent electrostatics and dispersion lengthen the bond. The effects of these forces from the medium to long-range are also discussed. Our analysis provides a complete picture for blue-shifting H-bonds and suggests two necessary conditions for their features to be observed at equilibrium structures: (i) stronger Pauli repulsion than the combination of electrostatic and dispersion forces; (ii) relatively weak CT that is insufficient to compensate for the blue-shifting effect of the frozen interaction.
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Affiliation(s)
- Yuezhi Mao
- Kenneth S. Pitzer Center for Theoretical Chemistry, Department of Chemistry , University of California at Berkeley , Berkeley , California 94720 , United States
| | - Martin Head-Gordon
- Kenneth S. Pitzer Center for Theoretical Chemistry, Department of Chemistry , University of California at Berkeley , Berkeley , California 94720 , United States
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
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23
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Tang S, Du L. Effects of methylation in acceptors on the hydrogen bond complexes between 2,2,2-trifluoroethanol and cyclic ethers. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 217:237-246. [PMID: 30947132 DOI: 10.1016/j.saa.2019.03.088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/24/2019] [Accepted: 03/25/2019] [Indexed: 05/15/2023]
Abstract
In order to explore the effect of methylation on the stability and spectral shift of hydrogen bond complexes, the complexes of 2,2,2-trifluoroethanol (TFE) with propylene oxide (PO) and isobutylene oxide (IBO) were investigated by Fourier transform infrared (FTIR) spectroscopy and ab initio computations. The comparable OH-stretching red shifts were observed upon complexation, and an enhancement of the OH-stretching band is shown with the partial pressure of monomers increasing. The OH-stretching frequency of TFE is red shifted by 180 and 201 cm-1 with PO and IBO, respectively. By using quantum chemical calculations, we predicted the geometric parameters, binding energies, and spectral shifts of TFEPO/IBO hydrogen bond complexes. The calculated and observed spectral shifts follow the same trends. Compared with the TFEethylene oxide (EO) complex, the strength of the hydrogen bond in complex increases with the addition of methyl group, which likely results from the increase in basicity of the hydrogen bond acceptor. By combining the experimental integrated absorbance and the calculated IR intensity of the OH-stretching vibrational transition, the equilibrium constant for the complex formation was determined. In addition, atoms-in-molecules (AIM) and natural bond orbital (NBO) analyses were carried out to explain the red shift and the nature of the interaction in these complexes.
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Affiliation(s)
- Shanshan Tang
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
| | - Lin Du
- Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China.
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Behera B, Das PK. Blue-Shifted Hydrogen Bonding in the Gas Phase CH/D3CN···HCCl3 Complexes. J Phys Chem A 2019; 123:1830-1839. [DOI: 10.1021/acs.jpca.8b12200] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- B. Behera
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Puspendu K. Das
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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