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Bakhmutov VI, Contreras-Ramirez A, Drake H, Zhou HC. On phosphorus chemical shift anisotropy in metal (IV) phosphates and phosphonates: A 31 P NMR experimental study. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2023; 61:16-21. [PMID: 36117432 DOI: 10.1002/mrc.5313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 09/14/2022] [Accepted: 09/14/2022] [Indexed: 06/15/2023]
Abstract
The phosphorus chemical shift anisotropies, 31 PΔcs, and asymmetry parameters η were measured by the 31 P{1 H} NMR experiments in static and low-frequency spinning samples of the zirconium phosphates and phosphonates and also in the mixed Zr (IV)/Sn (IV) phosphate/phosphonate material. The data obtained have shown a 111 connectivity in the HPO4 and PO3 groups, which does not change at modification and intercalation of the materials. The 31 PΔcs values of the phosphonate groups (43-49 ppm) significantly surpass the values characterizing the HPO4 groups (23-37 ppm). The 31 P Δcs values obtained for the metal (IV) phosphates were discussed in terms of P-O distances. The 31 P chemical shift anisotropy parameters can help at elucidation of local structures in phosphate and phosphonate materials.
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Affiliation(s)
| | | | - Hannah Drake
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
| | - Hong-Cai Zhou
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas, USA
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2
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Xue W, Zhang X, Zhu W, Zhang X, Wang W, Peng L, Ma X, Li Y. Large-scale Heterogeneous Synthesis of Monodisperse High Performance Colloidal CsPbBr3 Nanocrystals. FUNDAMENTAL RESEARCH 2022. [DOI: 10.1016/j.fmre.2022.05.030] [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] Open
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Dwivedi N, Dubey R, Srivastava S, Sinha N. Unraveling Water-Mediated 31P Relaxation in Bone Mineral. ACS OMEGA 2022; 7:16678-16688. [PMID: 35601291 PMCID: PMC9118412 DOI: 10.1021/acsomega.2c01133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 04/15/2022] [Indexed: 06/09/2023]
Abstract
Bone is a dynamic tissue composed of organic proteins (mainly type I collagen), inorganic components (hydroxyapatite), lipids, and water that undergoes a continuous rebuilding process over the lifespan of human beings. Bone mineral is mainly composed of a crystalline apatitic core surrounded by an amorphous surface layer. The supramolecular arrangement of different constituents gives rise to its unique mechanical properties, which become altered in various bone-related disease conditions. Many of the interactions among the different components are poorly understood. Recently, solid-state nuclear magnetic resonance (ssNMR) has become a popular spectroscopic tool for studying bone. In this article, we present a study probing the interaction of water molecules with amorphous and crystalline parts of the bone mineral through 31P ssNMR relaxation parameters (T 1 and T 2) and dynamics (correlation time). The method was developed to selectively measure the 31P NMR relaxation parameters and dynamics of the crystalline apatitic core and the amorphous surface layer of the bone mineral. The measured 31P correlation times (in the range of 10-6-10-7 s) indicated the different dynamic behaviors of both the mineral components. Additionally, we observed that dehydration affected the apatitic core region more significantly, while H-D exchange showed changes in the amorphous surface layer to a greater extent. Overall, the present work provides a significant understanding of the relaxation and dynamics of bone mineral components inside the bone matrix.
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Affiliation(s)
- Navneet Dwivedi
- Centre
of Biomedical Research, Sanjay Gandhi Postgraduate
Institute of Medical Sciences, Raebareli Road, Lucknow, Uttar Pradesh 226014, India
- Department
of Physics, Integral University, Lucknow, Uttar Pradesh 226026, India
| | - Richa Dubey
- Centre
of Biomedical Research, Sanjay Gandhi Postgraduate
Institute of Medical Sciences, Raebareli Road, Lucknow, Uttar Pradesh 226014, India
| | - Seema Srivastava
- Department
of Physics, Integral University, Lucknow, Uttar Pradesh 226026, India
| | - Neeraj Sinha
- Centre
of Biomedical Research, Sanjay Gandhi Postgraduate
Institute of Medical Sciences, Raebareli Road, Lucknow, Uttar Pradesh 226014, India
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Design of Hybrid PAH Nanoadsorbents by Surface Functionalization of ZrO 2 Nanoparticles with Phosphonic Acids. NANOMATERIALS 2021; 11:nano11040952. [PMID: 33917895 PMCID: PMC8068232 DOI: 10.3390/nano11040952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/01/2021] [Accepted: 04/02/2021] [Indexed: 11/16/2022]
Abstract
This study focuses on the preparation of innovative nanocomposite materials based on surface modification of commercial nano-ZrO2 optimized from Brønsted acid-base surface reactions. This surface modification was carried out by direct grafting of suitable phosphonic acids bearing a vinylic or phenylic substituent in aqueous solution. Different loading quantities of the anchoring organophosphorus compounds were applied for each materials synthesis. The resulting nanohybrids were thoroughly characterized by infrared spectroscopy (DRIFT), solid-state nuclear magnetic resonance (NMR), nitrogen adsorption-desorption (BET), thermogravimetric analysis (TG), and X-ray photoelectron spectroscopy (XPS), demonstrating the reliability and efficient tunability of the surface functionalization based on the starting Zr/P ratio. Our nanocomposite materials exhibited a high specific surface area as well as complex porosity networks with well-defined meso-pore. The as-prepared materials were investigated for the adsorption of a mixture of 16 polycyclic aromatic hydrocarbons (PAHs) at 200 ng·mL-1 in an aqueous solution. Adsorption kinetics experiments of each individual material were carried out on the prepared PAHs standard solution for a contact time of up to 6 h. Pretreatments of the adsorption test samples were performed by solid-phase extraction (SPE), and the resulting samples were analyzed using an ultrasensitive GC-orbitrap-MS system. The pseudo-first-order and the pseudo-second-order models were used to determine the kinetic data. The adsorption kinetics were best described and fitted by the pseudo-second-order kinetic model. The correlation between the nature of the substituent (vinylic or phenylic) and the parameters characterizing the adsorption process were found. In addition, an increase of PAHs adsorption rates with phosphonic acid loading was observed.
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Abstract
Magnetic shielding depends on molecular structure and noncovalent interactions. This study shows that it is also measurably dependent on the electric field generated by surrounding molecules. This effect has been observed explicitly for 31P nucleus using the adduct under field approach. The results obtained indicate that the field strength experienced by molecules in crystals consisting of molecules with large dipole moments is similar to that in polar solvents. Therefore, magnetic shielding should explicitly depend on solvent polarity. It is important to note that this effect cannot be reproduced correctly within the polarizable continuum model approach.
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Affiliation(s)
- Ilya G Shenderovich
- Institute of Organic Chemistry, University of Regensburg, Universitaetstrasse 31, 93053 Regensburg, Germany
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Shenderovich IG. Experimentally Established Benchmark Calculations of
31
P NMR Quantities. ACTA ACUST UNITED AC 2020. [DOI: 10.1002/cmtd.202000033] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ilya G. Shenderovich
- Ilya G. Shenderovich Institute of Organic Chemistry University of Regensburg Universitaetstrasse 31 93053 Regensburg Germany
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Bakhmutov VI, Elliott DW, Contreras-Ramirez A, Clearfield A, Zhou HC. On Librational and Rotational Motions of Aromatic Rings in Layered Sn(IV) and Zr(IV) Phosphonate Materials: A Variable-Temperature 13C, 31P Solid-State NMR Study. J Phys Chem Lett 2020; 11:4958-4961. [PMID: 32496774 DOI: 10.1021/acs.jpclett.0c01173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
According to the solid-state 13C, 31P NMR study and 13C chemical shift anisotropy (CSA) measurements, aromatic rings in the layered metal(IV) phosphonate materials behave as low-energy rotors at rotation activation energy, Eact, of 1.4-3.0 kcal/mol. The rotational mechanism consists of 180° flips and librations around C(1)-C(4) axis. The amplitude of the librations, added to the flips, grows with temperature, shifting the reorientations toward rotational diffusion at high temperatures.
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Affiliation(s)
- Vladimir I Bakhmutov
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Douglas W Elliott
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Aida Contreras-Ramirez
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Abraham Clearfield
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Hong-Cai Zhou
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3003, United States
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Hubbard PJ, Benzie JW, Bakhmutov VI, Blümel J. Disentangling different modes of mobility for triphenylphosphine oxide adsorbed on alumina. J Chem Phys 2020; 152:054718. [PMID: 32035468 DOI: 10.1063/1.5142568] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Triphenylphosphine oxide (TPPO, 1) has been adsorbed on neutral alumina by dry grinding of the components in the absence of a solvent. The adsorption proves translational mobility of 1 on the surface of alumina. Different surface coverages from a densely packed monolayer (99% coverage) to a dilute sub-monolayer (25%) have been produced. The samples have been studied by diverse multinuclear 1H, 13C, and 31P variable temperature solid-state nuclear magnetic resonance (NMR) techniques. The interactions of 1 with the surface are determined by hydrogen bonding of the P=O group to OH groups on the surface. The 31P solid-state NMR spectra prove that even at low temperatures, the molecules of 1 are highly mobile on the surface. Using T1 and T2 relaxation time analyses of the 31P resonance in the solid state at variable temperatures allowed the identification and quantification of two different modes of mobility. Besides the translational mobility that consists of jumps from one hydrogen-bonding OH site on the surface to an adjacent one, a rotational movement around the axis defined by the P=O group of 1 occurs.
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Affiliation(s)
- Patrick J Hubbard
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, USA
| | - Jordon W Benzie
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, USA
| | - Vladimir I Bakhmutov
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, USA
| | - Janet Blümel
- Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, USA
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Bakhmutov VI, Elliott DW, Wylie GP, Clearfield A, Contreras-Ramirez A, Zhou HC. Pyridine-d 5 as a 2H NMR probe for investigation of macrostructure and pore shapes in a layered Sn( iv) phosphonate–phosphate material. Chem Commun (Camb) 2020; 56:3653-3656. [DOI: 10.1039/c9cc09254d] [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
Isotropic and anisotropic motions and molecular states of pyridine-d5, adsorbed on the surface within the pores of a layered Sn(iv) phosphonate–phosphate material (1) have been characterized thermodynamically and kinetically by solid-state NMR.
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Affiliation(s)
| | | | | | | | | | - Hong-Cai Zhou
- Department of Chemistry
- Texas A&M University
- College Station
- USA
- Department of Materials Science and Engineering
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Bakhmutov VI, Elliott DW, Contreras AR, Clearfield A. Guest Molecules in a Layered Microporous Tin(IV) Phosphonate-Phosphate Material: Solid State NMR Studies. J Phys Chem A 2018; 122:9901-9909. [PMID: 30500193 DOI: 10.1021/acs.jpca.8b09144] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
There is little systematic understanding of pore surfaces in layered microporous metal(IV) phosphate-phosphonate materials and their interactions with guest molecules. In this paper, we show how to probe the mobility of guest molecules in such poorly crystalline systems using multinuclear solid-state NMR and relaxation time measurements. Anisotropic motions of benzene- d6 molecules absorbed on the pore walls of material Sn(O3PC6H4PO3)0.85(O3POH)0.33 (1) have been recognized as the fast in-plane C6 rotation due to metal-π interactions with pore walls. The benzene- d6 absorption enthalpy due to Sn···π interactions has been determined as -Δ H = 5.9 kcal/mol. Specific interactions between pyridine and the pore walls of 1 have been observed as immobile pyridine, the population of which grows strongly at low temperatures to show thermodynamic parameters -Δ H of 5.0 kcal/mol and Δ S of -11.0 e.u. It has been suggested that these parameters characterize N···H-OP hydrogen bonding as a driving force for accumulation of immobile pyridine molecules in pores of compound 1.
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Affiliation(s)
- Vladimir I Bakhmutov
- Department of Chemistry , Texas A&M University , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Douglas W Elliott
- Department of Chemistry , Texas A&M University , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Aida R Contreras
- Department of Chemistry , Texas A&M University , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Abraham Clearfield
- Department of Chemistry , Texas A&M University , P.O. Box 30012, College Station , Texas 77842-3012 , United States
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Contreras AR, Bakhmutov VI, Elliott DW, Clearfield A. Benzene-d 6 and toluene-d 8 as guest molecules in micropores of a layered zirconium phosphonate: 2 H, 13 C{ 1 H}, and 31 P{ 1 H} solid-state NMR, deuterium NMR relaxation, and molecular motions. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:1158-1167. [PMID: 29974552 DOI: 10.1002/mrc.4779] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 06/04/2018] [Accepted: 06/26/2018] [Indexed: 06/08/2023]
Abstract
For the first time, pore spaces in the Zr (IV) phosphonate (1) as a representative of layered metal (IV) phosphonate materials have been investigated by studying mobility of guest molecules, benzene-d6 , and toluene-d8 . Guest molecules located in micropores of 1 have been characterized by solid-state 13 C{1 H} and 2 H NMR spectra in static samples with varying temperatures. At moderately low temperatures, the benzene and toluene molecules experience fast isotropic reorientations and show the motionally averaged liquid-like carbon and deuterium line shapes in the NMR spectra. At lower temperatures, two anisotropic motional modes have been found for benzene molecules by analyzing the 2 H NMR line shapes: the well-known in-plane C6 rotation and composite motions. Interpretation of the variable-temperature 2 H T1 relaxation times identifies the composite motions as 120° flips around the C6 axis perpendicular to the molecular plane and the rotations around the molecular para-C-C axis. The data obtained resulted in the idealized (cylinder-shaped) model of micropores in compound 1 with the diameter of 20-30 Å. Furthermore, the activation energy of 20.1 kJ/mol determined for the benzene motions classifies the molecule-surface interactions as weak but enough for absorption.
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Affiliation(s)
- Aida R Contreras
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
| | | | - Douglas W Elliott
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
| | - Abraham Clearfield
- Department of Chemistry, Texas A&M University, College Station, Texas, USA
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