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Koller TJ, Endraß SMJ, Rösch M, Witthaut K, Klapötke TM, Schnick W. On Tautomerism and Amphoterism: An In-Depth Structural and Physicochemical Characterization of Ammeline and Some of Its Salts. Angew Chem Int Ed Engl 2024; 63:e202404927. [PMID: 38746974 DOI: 10.1002/anie.202404927] [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: 03/12/2024] [Indexed: 06/28/2024]
Abstract
Ammeline is a simple, readily available, molecular compound, which has been known for nearly 200 years. Despite that, no proper structural characterization of ammeline has been conducted so far. For this reason, the prevalent tautomeric form of ammeline in the solid remained unknown to this date. In the course of this study, its crystal structure was finally established by single-crystal X-ray diffraction. In this structure, ammeline is exclusively found as its 4,6-diamino-1,3,5-triazin-2(1H)-one tautomer and adopts layered structure with an exceptionally high hydrogen bond density. Ammeline shows an interesting amphoteric behavior. Therefore, the synthesis and structural characterization of some of its salts were carried out to investigate the influence of the protonation degree on its molecular structure. In particular, the crystal structure of silver ammelinate monohydrate was solved as the first reported structure containing deprotonated ammeline. Moreover, the crystal structures of three different modifications of ammelinium perchlorate were elucidated and the transformation conditions between them were studied. Lastly, the crystal structure of ammelinediium diperchlorate monohydrate, containing unprecedented doubly protonated ammeline, was determined. The products' thermal behavior was studied by differential thermal analysis and thermogravimetric analysis. The perchlorate salts were additionally examined for their potential as insensitive high-energy-density materials.
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Affiliation(s)
- Thaddäus J Koller
- Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377, Munich, Germany
| | - Simon M J Endraß
- Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377, Munich, Germany
| | - Markus Rösch
- Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377, Munich, Germany
| | - Kristian Witthaut
- Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377, Munich, Germany
| | - Thomas M Klapötke
- Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377, Munich, Germany
| | - Wolfgang Schnick
- Department of Chemistry, University of Munich (LMU), Butenandtstraße 5-13, 81377, Munich, Germany
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2
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Almacellas D, Fonseca Guerra C, Poater J. Strengthened cooperativity of DNA-based cyclic hydrogen-bonded rosettes by subtle functionalization. Org Biomol Chem 2023; 21:8403-8412. [PMID: 37830458 DOI: 10.1039/d3ob01391j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2023]
Abstract
Cooperative effects cause extra stabilization of hydrogen-bonded supramolecular systems. In this work we have designed hydrogen-bonded rosettes derived from a guanine-cytosine Janus-type motif with the aim of finding a monomer that enhances the synergy of supramolecular systems. For this, relativistic dispersion-corrected density functional theory computations have been performed. Our proposal involves a monomer with three hydrogen-bonds pointing in the same direction, which translates into shorter bonds, stronger donor-acceptor interactions, and more attractive electrostatic interactions, thus giving rise to rosettes with strengthened cooperativity. This newly designed rosette has triple the cooperativity found for the naturally occurring guanine quadruplex.
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Affiliation(s)
- David Almacellas
- Departament de Química Inorgànica i Orgànica & IQTCUB, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
| | - Célia Fonseca Guerra
- Department of Chemistry and Pharmaceutical Sciences, AIMMS, Vrije Universiteit Amsterdam, De Boelelaan 1108, 1081 HZ Amsterdam, The Netherlands
| | - Jordi Poater
- Departament de Química Inorgànica i Orgànica & IQTCUB, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
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Borges A, de Oliveira IP, Lescano CH, Parreira RLT, Orenha RP, da Silva de Laurentiz R. Molecular interaction analysis of the lignans from Piper cubeba in complex with Haemonchus contortus phosphomethyltransferase. Vet Parasitol 2023; 321:110001. [PMID: 37549491 DOI: 10.1016/j.vetpar.2023.110001] [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: 04/18/2023] [Revised: 07/27/2023] [Accepted: 07/29/2023] [Indexed: 08/09/2023]
Abstract
In vitro larvicidal assays carried out previously by our research group with cubebin, dihydrocubebin and hinokinin, lignans extracted from the fruits of Piper cubeba, against Haemonchus contortus larvae showed strong action larvicidal these compounds. Hinokinin was the most active (EC50 = 0.34 µg/mL) with strong action on the cuticle of the larvae as observed by scanning electron microscopy of the L3 stage. Therefore, to understand the mechanism of action of these compounds in silico studies were carried out using the enzyme phosphomethyltransferase of Haemonchus contortus that contain PMT-1 and PMT-2 di-domains responsible for phosphocholine synthesis, which is one of the main lipids in nematodes. This pathway is not found in mammals, so this enzyme is an important biological target for the development of new anthelmintics. Results of molecular docking, molecular dynamic and a density functional theory calculations studies with the three lignans show few interactions with PMT-1. However, hinokinin has important interactions with PMT-2, that can deactivate the enzyme and interrupt the phosphocholine synthesis, which is an essential compound for the development and maintenance of the nematode cuticle and its survive. Therefore, the previous results of the in vitro assay allied with in silico results, now realized; suggest that hinokinin may be a possible selective target for the development of new anthelmintics against Haemonchus contortus since the PMT-2 domain is present in this nematode.
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Affiliation(s)
- Alexandre Borges
- Universidade Estadual Paulista, Departamento de Física e Química, Faculdade de Engenharia de Ilha Solteira, Ilha Solteira, SP, Brazil; Faculdade de Medicina, Centro Universitário de Santa Fé do Sul - UNIFUNEC, Santa Fé do Sul, SP, Brazil
| | - Ivan Pires de Oliveira
- Universidade Federal de Minas Gerais, Instituto de Ciências Agrícolas, Montes Claros, MG, Brazil
| | | | | | - Renato Pereira Orenha
- Universidade de Franca, Centro de Pesquisas em Ciências Exatas e Tecnológicas, Franca, SP, Brazil
| | - Rosangela da Silva de Laurentiz
- Universidade Estadual Paulista, Departamento de Física e Química, Faculdade de Engenharia de Ilha Solteira, Ilha Solteira, SP, Brazil.
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Shi Y, Chen S, Xu K, Zhao L, Liu Y, Zou Q, Zhang H, Zhu H, Zhang T, Sun H. Exposure to nitrogenous based flame retardants in Chinese population: Evidence from a national-scale study. JOURNAL OF HAZARDOUS MATERIALS 2023; 445:130653. [PMID: 37056013 DOI: 10.1016/j.jhazmat.2022.130653] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/30/2022] [Accepted: 12/20/2022] [Indexed: 06/19/2023]
Abstract
Extensive use of nitrogen-based flame retardants (NFRs) has resulted in their widespread environmental occurrence. To investigate human exposure to NFRs on a national scale, the abundance and spatial distribution of NFRs were assessed in urine specimens collected from 13 cities in China. Six out of eight target NFRs were detectable in more than half of the urine samples, and the total concentrations of NFRs ranged from 3.22 to 880 ng/mL with a median of 46.7 ng/mL. Cyanuric acid was the most abundant chemical, accounting for 66.2%, followed by melamine (16.3%), ammelide (10.8%), and ammeline (6.11%). Regional differences in concentrations and composition profiles of NFRs were observed within China as a result of different production and application profiles. In addition, we found that urinary NFRs levels were much higher than but statistically correlated with that of organophosphates (r2 = 0.69, p < 0.05), another class of phosphorus-based flame retardant, implying similar emission sources and/or human exposure pathways. Furthermore, the estimated daily intakes and hazard quotients revealed that the Chinese population's exposure to NFRs is within safe limits. To the best of our knowledge, this is the first study to document the ubiquitous occurrence and region-specific variations of human exposure to NFRs in China.
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Affiliation(s)
- Yumeng Shi
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Shucong Chen
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Ke Xu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Leicheng Zhao
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Yarui Liu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Qiang Zou
- Department of Interventional Therapy, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Henglin Zhang
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
| | - Hongkai Zhu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Tao Zhang
- School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
| | - Hongwen Sun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
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Petelski AN, Pamies SC, Márquez MJV, Sosa GL, Peruchena NM. Impact of covalent modifications on the hydrogen bond strengths in diaminotriazine supramolecules. Chemphyschem 2022; 23:e202200151. [PMID: 35420735 DOI: 10.1002/cphc.202200151] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/13/2022] [Indexed: 11/10/2022]
Abstract
Melamine (M) is a popular triamine triazine compound in the field of supramolecular materials. In this work, we have computationally investigated how substituents can be exploited to improve the binding strength of M supramolecules. Two types of covalent modifications were studied: the substitution of an H atom within an amine group -NHR, and the replacement of the whole -NH 2 group (R = H, F, CH 3 and COCH 3 ). Through our dispersion-corrected density functional theory computations, we explain which covalent modification will show the best self-assembling capabilities, and why the binding energy is enhanced. Our charge density and molecular orbital analyses indicate that the best substituents are those that generate a charge accumulation on the endocyclic N atom, providing an improvement of the electrostatic attraction. At the same time the substituent assists the main N-H⋅⋅⋅N hydrogen bonds by interacting with the amino group of the other monomer. We also show how the selected group notably boosts the strength of hexameric rosettes. This research, therefore, provides molecular tools for the rational design of emerging materials based on uneven hydrogen-bonded arrangements.
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Affiliation(s)
- Andre Nicolai Petelski
- Universidad Tecnológica Nacional: Universidad Tecnologica Nacional, Chemical Engioneering, French 414, H3500CHJ, Resistencia, ARGENTINA
| | - Silvana Carina Pamies
- Universidad Tecnológica Nacional: Universidad Tecnologica Nacional, Chemical Engineering, French 414, H3500CHJ, Resistencia, ARGENTINA
| | - María Josefina Verónica Márquez
- Universidad Tecnológica Nacional: Universidad Tecnologica Nacional, Chemical Engineering, French 414, H3500CHJ, Resistencia, ARGENTINA
| | - Gladis Laura Sosa
- Universidad Tecnológica Nacional: Universidad Tecnologica Nacional, Chemical Engineering, French 414, H3500CHJ, Resistencia, ARGENTINA
| | - Nélida María Peruchena
- National University of the Northeast: Universidad Nacional del Nordeste, Chemistry, Avenida Libertad 5460, 3400, Corrientes, ARGENTINA
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Orenha RP, da Silva VB, Caramori GF, Piotrowski MJ, Nagurniak GR, Parreira RLT. The design of anion-π interactions and hydrogen bonds for the recognition of chloride, bromide and nitrate anions. Phys Chem Chem Phys 2021; 23:11455-11465. [PMID: 33956017 DOI: 10.1039/d1cp00113b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of anions in several biochemical processes has given rise to enormous interest in the identification/exploration of compounds with the potential ability to recognize anions. Here, an anthracene-squaramide conjugated compound, O2C4[NH(C14H10)][(NH(C6H6)], has been modified through the substitutions (i) H → F and (ii) H → OH at the anthracene and benzene rings to improve the capabilities of these structures for recognizing chloride, bromide, and nitrate anions. Through an energy decomposition analysis method, the recognition of the anions is chiefly identified as a non-covalent process. H → F substitutions at the benzene ring and, principally, the anthracene ring favor anion recognition, since H → F substitutions create a π-acid region in the aromatic ring, as indicated based on the molecular electrostatic potential surfaces. Similarly, H → OH substitutions also improve the recognition of anions, which is related to the establishment of partly covalent chemical bonds of the form O-H(Cl-, Br- and O-), which are verified based on the quantitative analysis of the maximum and minimum values of the molecular electrostatic potential surfaces and the quantum theory of atoms in molecules method. The presence of large electron density has a key role in the recognition of Cl- anions, and the more favorable electrostatic interactions between the anthracene structure and Br- anions, relative to NO3- anions, mean that receptorBr- interactions are more attractive than receptorNO3- ones. These data can contribute to the design of structures with the relevant abilities to interact with anions.
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Affiliation(s)
- Renato Pereira Orenha
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil.
| | - Vanessa Borges da Silva
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil.
| | - Giovanni Finoto Caramori
- Departamento de Química, Universidade Federal de Santa Catarina, Campus Universitário Trindade, CP 476, Florianópolis, SC 88040-900, Brazil
| | | | - Glaucio Regis Nagurniak
- Department of Exact Sciences and Education, Federal University of Santa Catarina, 89036-004, Blumenau, SC, Brazil
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Orenha RP, Cintra CH, Natal MLL, Colaço MC, Caramori GF, Piotrowski MJ, Parreira RLT. Design of supramolecular systems capable of recognizing anions uniquely by aliphatic C–H⋯anion hydrogen bonds: theoretical insights. NEW J CHEM 2021. [DOI: 10.1039/d1nj03320d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Anions play important roles in the environment. The anionic recognition through –CH polarized groups has been elucidated from DFT calculations.
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Affiliation(s)
- Renato Pereira Orenha
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil
| | - Claudia Haber Cintra
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil
| | - Maria Laura Lucas Natal
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil
| | - Matheus Cachoeira Colaço
- Departamento de Química, Universidade Federal de Santa Catarina, Campus Universitário Trindade, CP 476, Florianópolis, SC, 88040-900, Brazil
| | - Giovanni Finoto Caramori
- Departamento de Química, Universidade Federal de Santa Catarina, Campus Universitário Trindade, CP 476, Florianópolis, SC, 88040-900, Brazil
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Petelski AN, Fonseca Guerra C. Designing Self-Assembled Rosettes: Why Ammeline is a Superior Building Block to Melamine. ChemistryOpen 2019; 8:135-142. [PMID: 30740288 PMCID: PMC6356174 DOI: 10.1002/open.201800210] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 10/25/2018] [Indexed: 01/16/2023] Open
Abstract
In supramolecular chemistry, the rational design of self-assembled systems remains a challenge. Herein, hydrogen-bonded rosettes of melamine and ammeline have been theoretically examined by using dispersion-corrected density functional theory (DFT-D). Our bonding analyses, based on quantitative Kohn-Sham molecular orbital theory and corresponding energy decomposition analyses (EDA), show that ammeline is a much better building block than melamine for the fabrication of cyclic complexes based on hydrogen bonds. This superior capacity is explained by both stronger hydrogen bonding and the occurrence of a strong synergy.
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Affiliation(s)
- Andre Nicolai Petelski
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale ModelingVrije Universiteit AmsterdamDe Boelelaan 10831081HVAmsterdamThe Netherlands
- Departamento de Ingeniería QuímicaGrupo de Investigación en Química Teórica y Experimental (QuiTEx)Facultad Regional ResistenciaUniversidad Tecnológica NacionalFrench 414H3500CHJResistenciaChacoArgentina
| | - Célia Fonseca Guerra
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale ModelingVrije Universiteit AmsterdamDe Boelelaan 10831081HVAmsterdamThe Netherlands
- Leiden Institute of Chemistry, Gorlaeus LaboratoriesLeiden UniversityThe Netherlands
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