1
|
Araar H, Benounis M, Direm A, Touati A, Atailia S, Barhoumi H, Jaffrezic-Renault N. A new thin film modified glassy carbon electrode based on melaminium chloride pentachlorocuprate(II) for selective determination of nitrate in water. MONATSHEFTE FUR CHEMIE 2019. [DOI: 10.1007/s00706-019-02483-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
2
|
Kessler FK, Schuhbeck AM, Schnick W. Melamium Thiocyanate Melam, a Melamium Salt with Disordered Anion Sites. Z Anorg Allg Chem 2019. [DOI: 10.1002/zaac.201900054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fabian K. Kessler
- Department of Chemistry; Chair in Inorganic Solid-State Chemistry; University of Munich (LMU); Butenandtstraße 5-13 81377 Munich Germany
| | - Alexander M. Schuhbeck
- Department of Chemistry; Chair in Inorganic Solid-State Chemistry; University of Munich (LMU); Butenandtstraße 5-13 81377 Munich Germany
| | - Wolfgang Schnick
- Department of Chemistry; Chair in Inorganic Solid-State Chemistry; University of Munich (LMU); Butenandtstraße 5-13 81377 Munich Germany
| |
Collapse
|
3
|
Lakshminarasimhan N, Sangeetha D, Nivetha G. Metachromasy of methylene blue due to aggregation over phosphate–modified polymeric carbon nitride. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.03.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
4
|
Chakarawet K, Knopf I, Nava M, Jiang Y, Stauber JM, Cummins CC. Crystalline Metaphosphate Acid Salts: Synthesis in Organic Media, Structures, Hydrogen-Bonding Capability, and Implication of Superacidity. Inorg Chem 2016; 55:6178-85. [DOI: 10.1021/acs.inorgchem.6b00749] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Khetpakorn Chakarawet
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Ioana Knopf
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Matthew Nava
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Yanfeng Jiang
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Julia M. Stauber
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Christopher C. Cummins
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| |
Collapse
|
5
|
Mangstl M, Celinski VR, Johansson S, Weber J, An F, Schmedt auf der Günne J. Low temperature synthesis of ionic phosphates in dimethyl sulfoxide. Dalton Trans 2014; 43:10033-9. [DOI: 10.1039/c4dt00544a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new synthesis route for phosphates in an organic solvent at low temperatures is presented.
Collapse
Affiliation(s)
- Martin Mangstl
- Inorganic Materials Chemistry
- University of Siegen
- D-57068 Siegen, Germany
| | | | | | - Johannes Weber
- Inorganic Materials Chemistry
- University of Siegen
- D-57068 Siegen, Germany
| | - Feng An
- Department of Chemistry
- University of Munich
- D-81377 Munich, Germany
| | | |
Collapse
|
6
|
Naik AD, Fontaine G, Samyn F, Delva X, Louisy J, Bellayer S, Bourgeois Y, Bourbigot S. Mapping the multimodal action of melamine-poly(aluminium phosphate) in the flame retardancy of polyamide 66. RSC Adv 2014. [DOI: 10.1039/c4ra02005g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Multimodal action and synergism of melamine poly(aluminum phosphate) in the flame retardancy of polyamide 66.
Collapse
Affiliation(s)
- Anil D. Naik
- ISP/UMET – UMR/CNRS 8207
- Ecole Nationale Supérieure de Chimie de Lille (ENSCL)
- 59652 Villeneuve d'Ascq Cedex, France
| | - Gaëlle Fontaine
- ISP/UMET – UMR/CNRS 8207
- Ecole Nationale Supérieure de Chimie de Lille (ENSCL)
- 59652 Villeneuve d'Ascq Cedex, France
| | - Fabienne Samyn
- ISP/UMET – UMR/CNRS 8207
- Ecole Nationale Supérieure de Chimie de Lille (ENSCL)
- 59652 Villeneuve d'Ascq Cedex, France
| | | | | | - Séverine Bellayer
- ISP/UMET – UMR/CNRS 8207
- Ecole Nationale Supérieure de Chimie de Lille (ENSCL)
- 59652 Villeneuve d'Ascq Cedex, France
| | | | - Serge Bourbigot
- ISP/UMET – UMR/CNRS 8207
- Ecole Nationale Supérieure de Chimie de Lille (ENSCL)
- 59652 Villeneuve d'Ascq Cedex, France
| |
Collapse
|
7
|
Ilyukhin AB, Koroteev PS, Kiskin MA, Dobrokhotova ZV, Novotortsev VM. Supramolecular interactions in the structures of carboxylate derivatives of cymantrene and single-charged cations. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.08.038] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
8
|
Weng DF, Wang BW, Wang ZM, Gao S. Polymorphism of (H2mela)2[CuCl5]Cl (mela = melamine): structures, transformation and magnetic properties. CrystEngComm 2011. [DOI: 10.1039/c1ce05143a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
9
|
Toumi Akriche S, Rzaigui M, Elothman ZA, Mahfouz RM. Bis(2-amino-3-nitropyridinium) dihydrogendiphosphate. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o358. [PMID: 21579783 PMCID: PMC2979822 DOI: 10.1107/s1600536810000942] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Accepted: 01/07/2010] [Indexed: 11/30/2022]
Abstract
The structure of the title compound, 2C5H6N3O2+·H2P2O72−, contains infinite (H2P2O72−)n layers stacked perpendicular to the a axis. The 2-amino-3-nitropyridinium cations are arranged in pairs and are anchored between these layers, linking them by N—H⋯O and C—H⋯O hydrogen-bonding and electrostatic interactions between anionic and cationic species to form a three-dimensional network.
Collapse
|
10
|
Salager E, Stein RS, Pickard CJ, Elena B, Emsley L. Powder NMR crystallography of thymol. Phys Chem Chem Phys 2009; 11:2610-21. [PMID: 19421517 DOI: 10.1039/b821018g] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A protocol for the structure determination of powdered solids at natural abundance by NMR is presented and illustrated for the case of the small drug molecule thymol. The procedure uses proton spin-diffusion data from two-dimensional NMR experiments in combination with periodic DFT refinements incorporating (1)H and (13)C NMR chemical shifts. For thymol, the method yields a crystal structure for the powdered sample, which differs by an atomic root-mean-square-deviation (all atoms except methyl group protons) of only 0.07 A from the single crystal X-ray diffraction structure with DFT-optimized proton positions.
Collapse
Affiliation(s)
- Elodie Salager
- Université de Lyon, (CNRS/ENS-Lyon/UCB Lyon 1), Centre de RMN à Très Hauts Champs, 5 rue de la Doua, 69100, Villeurbanne, France
| | | | | | | | | |
Collapse
|
11
|
Coelho C, Rocha J, Madhu PK, Mafra L. Practical aspects of Lee-Goldburg based CRAMPS techniques for high-resolution 1H NMR spectroscopy in solids: implementation and applications. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 194:264-282. [PMID: 18703365 DOI: 10.1016/j.jmr.2008.07.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 07/15/2008] [Accepted: 07/18/2008] [Indexed: 05/26/2023]
Abstract
Elucidating the local environment of the hydrogen atoms is an important problem in materials science. Because (1)H spectra in solid-state nuclear magnetic resonance (NMR) suffer from low resolution due to homogeneous broadening, even under magic-angle spinning (MAS), information of chemical interest may only be obtained using certain high-resolution (1)H MAS techniques. (1)H Lee-Goldburg (LG) CRAMPS (Combined Rotation And Multiple-Pulse Spectroscopy) methods are particularly well suited for studying inorganic-organic hybrid materials, rich in (1)H nuclei. However, setting up CRAMPS experiments is time-consuming and not entirely trivial, facts that have discouraged their widespread use by materials scientists. To change this status quo, here we describe and discuss some important aspects of the experimental implementation of CRAMPS techniques based on LG decoupling schemes, such as FSLG (Frequency Switched), and windowed and windowless PMLG (Phase Modulated). In particular, we discuss the influence on the quality of the (1)H NMR spectra of the different parameters at play, for example LG (Lee-Goldburg) pulses, radio-frequency (rf) phase, frequency switching, and pulse imperfections, using glycine and adamantane as model compounds. The efficiency and robustness of the different LG-decoupling schemes is then illustrated on the following materials: organo-phosphorus ligand, N-(phosphonomethyl)iminodiacetic acid [H(4)pmida] [I], and inorganic-organic hybrid materials (C(4)H(12)N(2))[Ge(2)(pmida)(2)OH(2)] x 4H(2)O [II] and (C(2)H(5)NH(3))[Ti(H(1.5)PO(4))(PO(4))](2) x H(2)O [III].
Collapse
Affiliation(s)
- Cristina Coelho
- Department of Chemistry, CICECO, University of Aveiro, Aveiro, Portugal
| | | | | | | |
Collapse
|
12
|
Brinkmann A, Litvinov VM, Kentgens APM. Environmentally friendly flame retardants. A detailed solid-state NMR study of melamine orthophosphate. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45 Suppl 1:S231-S246. [PMID: 18157843 DOI: 10.1002/mrc.2159] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We used solid-state NMR spectroscopy to gain detailed information about the proton positions, proximities and the hydrogen-bonding network in the environmentally friendly flame retardant melamine orthophosphate (MP). High-resolution proton one- and two-dimensional solid-state NMR spectra were obtained at high external magnetic field in combination with fast magic angle spinning of the sample. Furthermore, we recorded homo- and heteronuclear correlation spectra of types (15)N–(15)N, (1)H–(13)C, (1)H–(15)N and (1)H–(31)P. In addition, we determined the geometry of the NH and NH(2) groups in MP by (15)N–(1)H heteronuclear recoupling experiments.We were able to completely assign the different isotropic chemical shifts in MP. Furthermore, we could identify the protonation of the melamine and orthophosphate moieties. The experimental results are discussed in connection with the structural model obtained by powder X-ray diffraction together with a combined molecular modeling-Rietveld refinement approach (De Ridder et al. Helv. Chim. Acta 2004; 87: 1894). We show that the geometry of the NH2 groups can only be successfully estimated by solid-state NMR.
Collapse
Affiliation(s)
- Andreas Brinkmann
- Physical Chemistry/Solid State NMR, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands.
| | | | | |
Collapse
|
13
|
Brodski V, Peschar R, Schenk H, Brinkmann A, Bloemberg TG, van Eck ERH, Kentgens APM. Structural Analysis of a Melaminium Polyphosphate from X-ray Powder Diffraction and Solid-State NMR Data. J Phys Chem B 2005; 109:13529-37. [PMID: 16852693 DOI: 10.1021/jp0512715] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The crystal structure of the environmentally friendly flame retardant melaminium polyphosphate (MPoly) (2,4,6-triamino-1,3,5-triazinium x PO(3))(n)was determined by a direct-space global optimization technique from X-ray powder diffraction data. Solid-state NMR was used to corroborate the proposed hydrogen-bonding model and to determine the average degree of polymerization (n > 100). An analysis of the crystal structure of MPoly reveals aspects of molecular geometry and packing that are characteristic for melamine-containing compounds and polyphosphate salts. A comparison of MPoly with the crystal structures of its precursors melaminium orthophosphate (MP) and melaminium dihydrogenpyrophosphate (MPy) provides insight in the mechanism of the endothermic dehydration processes that takes place in the reaction path MP --> MPy --> MPoly. Solid-state NMR characterization of various samples of the same batch showed inhomogeneities in the MPoly composition. Various quantities of orthophosphates were found, which cannot be assigned to be MP.
Collapse
Affiliation(s)
- Vladimir Brodski
- Universiteit van Amsterdam, van't Hoff Institute for Molecular Sciences, Laboratory for Crystallography, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands.
| | | | | | | | | | | | | |
Collapse
|