Spectral Differences of the Molecule-ion Adducts of β-Cyclodextrin and Lithium Carbonate

Bai, Lei; Song, Lexin; Wang, Mang; Zhu, Lin-Hong

doi:10.1088/1674-0068/23/01/117-124

Cited by 3 publications

(22 citation statements)

References 32 publications

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“…2.1 Group 1 ( 1 H, 2 H, 3 H, 6,7 Li, 23 Na, 39 K, 87 Rb, 133 Cs) 2.1.1 Hydrogen ( 1 H) (I = 1/2). The equilibrium geometry, various bonding features and harmonic vibrational frequencies of antiproliferative drug methotrexate (MTX) were studied by calculations using B3LYP density functional theory (DFT) and time-dependent density functional theory (TD-DFT).…”

Section: Shielding Of Particular Nuclear Speciesmentioning

confidence: 99%

“…A small shielding effect on the hydrogen atoms of chiral carbons of bcyclodextrin (b-CD) was detected by 1 H NMR and a large environmental change caused by Li 2 CO 3 was observed by polarimetry in aqueous solution. 7 The relationship between the formation conditions and spectral performances for complexes formed from b-CD and Li 2 CO 3 was studied. The racemisation barrier and 1 H and 13 C chemical shieldings for tris(2-methylbenzimidazol-1-yl)methane were studied.…”

Section: Shielding Of Particular Nuclear Speciesmentioning

confidence: 99%

“…41 6 Li DOSY provides the identification means for peaks in the 6 Li spectrum and the evidence of mixed aggregates based on relative diffusion coefficients. The layered Li 2 TiO 3 was investigated by using a combination of 6,7 Li NMR over a wide temperature range (150-500 K) and molecular dynamics (MD) simulations. 42 The high-field (21.1 T) 6 Li MAS NMR shows a new tetrahedral lithium site along with the three crystallographic octahedral sites in Li 2 TiO 3 and the 7 Li static NMR and stimulated echo experiments show slow and partial lithium diffusion in Li 2 TiO 3 .…”

Section: Tritium ( 3 H) (I = 1/2) a Simple Sensitive And Accurate Amentioning

confidence: 99%

“…The layered Li 2 TiO 3 was investigated by using a combination of 6,7 Li NMR over a wide temperature range (150-500 K) and molecular dynamics (MD) simulations. 42 The high-field (21.1 T) 6 Li MAS NMR shows a new tetrahedral lithium site along with the three crystallographic octahedral sites in Li 2 TiO 3 and the 7 Li static NMR and stimulated echo experiments show slow and partial lithium diffusion in Li 2 TiO 3 . The Li-mobility in Li 3 Fe 2 (PO 4 ) 3 was elucidated by using solid-state 6 Li NMR and three crystallographic unique Li sites were resolved by MAS technique with paramagnetic shifts arising at 45 ppm, 102 ppm and 216 ppm.…”

Section: Tritium ( 3 H) (I = 1/2) a Simple Sensitive And Accurate Amentioning

confidence: 99%

“…43 The structural features of xLi[Mn 1.5 Ni 0.5 ]O 4 Á (1 À x)(Li 2 MnO 3 Á Li[Mn 0.5 Ni 0.5 ]O 2 ), were studied and the existence of a layered and a spinel component in samples with 0oxo1 was confirmed by both x-ray diffraction and 6 Li MAS NMR spectroscopy. 44 The coordination mode of phenantroline (phen) and bipyridine (bipy) to Li þ ions was found to be [Li(phen) 2 ] þ and [Li(bipy) 2 ] þ in the weakly coordinating solvent nitromethane by using 7 Li NMR spectroscopy. 45 The interaction among the metal centre, the ligand and solvents was studied on the basis of the chemical shift of the 7 Li signal with using DFT (RB3LYP/LANL2DZp) calculations.…”

Section: Tritium ( 3 H) (I = 1/2) a Simple Sensitive And Accurate Amentioning

confidence: 99%

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Applications of nuclear shielding

Kuroki¹,

Matsukawa²,

Yasunaga³

2011

Nuclear Magnetic Resonance

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Section: Shielding Of Particular Nuclear Speciesmentioning

confidence: 99%

Section: Shielding Of Particular Nuclear Speciesmentioning

confidence: 99%

Section: Tritium ( 3 H) (I = 1/2) a Simple Sensitive And Accurate Amentioning

confidence: 99%

Section: Tritium ( 3 H) (I = 1/2) a Simple Sensitive And Accurate Amentioning

confidence: 99%

Section: Tritium ( 3 H) (I = 1/2) a Simple Sensitive And Accurate Amentioning

confidence: 99%

See 3 more Smart Citations

Applications of nuclear shielding

Kuroki¹,

Matsukawa²,

Yasunaga³

2011

Nuclear Magnetic Resonance

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Low-Temperature Carbonization and More Effective Degradation of Carbohydrates Induced by Ferric Trichloride

2012

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The present work is devoted to an attempt to understand the effect of an inorganic salt such as ferric trichloride (FeCl(3)) on the carbonization and degradation of carbohydrates such as β-cyclodextrin (CD), amylose, and cellulose. Our data revealed two important observations. First, the presence of FeCl(3) led to the occurrence of a low carbonization temperature of 373 K. This is a rare phenomenon, in which carbonization improvement is present even if a small amount of FeCl(3) was added. Experimental results had provided evidence for the fact that a redox process was started during the low-temperature carbonization of β-CD, causing the reduction of FeCl(3) to ferrous chloride (FeCl(2)) by carbon materials formed in the carbonization process in air. However, the reduction process of FeCl(3) produced the in situ composite nanomaterial of Fe-FeCl(2) combination in nitrogen. Second, a molecule-ion interaction emerged between FeCl(3) and the carbohydrates in aqueous solution, resulting in a more effective degradation of the carbohydrates. Moreover, our results demonstrated that FeCl(3) played the role of a catalyst during the degradation of the carbohydrates in solution. We believe that the current work not only has a significant potential application in disposal of waste carbohydrates but also could be helpful in many fields such as environmental protection, biomass energy development, and inorganic composite nanomaterials.

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Functional significance of molecule–ion interactions between a series of inorganic salts and β-cyclodextrin

Song

Pan

Bai

et al. 2011

Supramolecular Chemistry

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2011) Functional significance of molecule-ion interactions between a series of inorganic salts and β-cyclodextrin, Supramolecular Chemistry, 23:6, 447-454, In the present work, b-cyclodextrin (CD) was employed to form molecule -ion adducts with a series of inorganic salts, in order to investigate whether there is a relation between the change in thermal behaviour of b-CD and the presence and properties of inorganic salts. Our results indicated that all the adducted b-CDs decomposed earlier than free b-CD. In particular, significant changes in maximum decomposition temperature (T m ) and maximum decomposition rate (V m ) of b-CD upon adduct had a close connection with the nature of inorganic salts. For example, the effects of chlorides and sodium oxysalts on T m of b-CD decreased in the order: CaCl 2 . LiCl . KCl . NaCl and Na 3 PO 4 . Na 2 CO 3 . NaNO 3 , respectively. Interestingly, the orders were in good accord with the effects of b-CD on the molar conductivities of the salt solutions. Furthermore, mass spectral data indicated that the thermal release behaviour of the adducted products was quite different not only from one another but also from free b-CD based on comparisons of relative abundances of decomposed fragments at the same heating times. We believe that the results obtained from this study provide a new understanding of how the nature of inorganic salts relates to the thermal degradation of a carbohydrate.

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Spectral Differences of the Molecule-ion Adducts of β-Cyclodextrin and Lithium Carbonate

Cited by 3 publications

References 32 publications

Applications of nuclear shielding

Applications of nuclear shielding

Low-Temperature Carbonization and More Effective Degradation of Carbohydrates Induced by Ferric Trichloride

Functional significance of molecule–ion interactions between a series of inorganic salts and β-cyclodextrin

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