An X-Ray Diffraction Study on the Stucture of 18-Crown-6 Ether Complexes with Alkali Metal Ions in Aqueous Solution

1989 ◽  
Vol 62 (9) ◽  
pp. 2807-2818 ◽  
Author(s):  
Kazuhiko Ozutsumi ◽  
Masahiko Natsuhara ◽  
Hitoshi Ohtaki
Keyword(s):  
Aqueous Solution ◽  
Alkali Metal ◽  
Metal Ions ◽  
Diffraction Study ◽  
Alkali Metal Ions ◽  
X Ray Diffraction ◽  
X Ray

The influence of alkali-metal ions on the molecular and supramolecular structure of manganese(II) complexes with tetrachlorophthalate ligands

2015 ◽  
Vol 70 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Hong-Dan Wang ◽  
Ming-Yang He ◽  
Qun Chen ◽  
Sheng-Chun Chen
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Supramolecular Structure ◽  
Critical Role ◽  
Alkali Metal Ions ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Space Groups ◽  
Dinuclear Structure

AbstractIn our efforts to investigate the influence of alkali-metal ions on the formation of metal complexes with polyhalogen-substituted benzenedicarboxylates, two manganese(II) complexes of tetrachlorophthalic acid (1,2-H2BDC-Cl4), [Mn2(1,2-BDC-Cl4)2(H2O)9]·H2O (1) and [MnK2(1,2-BDC-Cl4)2(H2O)4]n (2), were synthesized and structurally characterized. Single-crystal X-ray diffraction studies have revealed that complexes 1 and 2 crystallize in space groups P1̅ and Pbcn, respectively. Complex 1 shows a discrete dinuclear structure, while complex 2 features a two-dimensional heterometallic framework containing rare Mn–O–K linkages. The results clearly suggest that the introduction of alkali metal ions does play a critical role in the construction of complexes 1 and 2 with distinct dimensionality and connectivity. Their spectroscopic, thermal, and fluorescence properties have also been studied briefly.

Removal of Heavy Metals from Aqueous Solution by Hydroxyapatite/Chitosan Composite

2013 ◽  
Vol 789 ◽  
pp. 176-179 ◽  
Author(s):  
Eny Kusrini ◽  
Nofrijon Sofyan ◽  
Dwi Marta Nurjaya ◽  
Santoso Santoso ◽  
Dewi Tristantini
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Removal Of Heavy Metals ◽  
Sem Micrograph ◽  
Pseudo Second Order ◽  
Chitosan Composite

Hydroxyapatite/chitosan (HApC) composite has been prepared by precipitation method and used for removal of heavy metals (Cr6+, Zn2+and Cd2+) from aqueous solution. The HAp and 3H7C composite with HAp:chitosan ratio of 3:7 (wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy. The SEM results showed that HAp is spherical-shaped and crystalline, while chitosan has a flat structure. SEM micrograph of 3H7C composite reveals crystalline of HAp uniformly spread over the surface of chitosan. The crystal structure of HAp is maintained in 3H7C composite. Chitosan affects the adsorption capacity of HAp for heavy metal ions; it binds the metal ions as well as HAp. The kinetic data was best described by the pseudo-second order. Surface adsorption and intraparticle diffusion take place in the mechanism of adsorption process. The binding of HAp powder with chitosan made the capability of composite to removal of Cr6+, Zn2+and Cd2+from aqueous solution effective. The order of removal efficiency (Cr6+> Cd2+> Zn2+) was observed.

scholarly journals Dynamic ionic radius of alkali metal ions in aqueous solution: a pulsed-field gradient NMR study

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20252-20257
Author(s):  
Kikuko Hayamizu ◽  
Yusuke Chiba ◽  
Tomoyuki Haishi
Keyword(s):  
Aqueous Solution ◽  
Alkali Metal ◽  
Metal Ions ◽  
Field Gradient ◽  
Ionic Radius ◽  
Alkali Metal Ions ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Nmr Study ◽  
Stokes Radius

Stokes radius (dynamic ionic radius) of the alkali metal ions versus the ionic radius (Rion) at 303 K. The dotted line is a guide for the 1 : 1 relation.

X-ray diffraction study of a “three-ion” aqueous solution

1977 ◽  
Vol 47 (2) ◽  
pp. 275-278 ◽  
Author(s):  
R. Caminiti ◽  
G. Licheri ◽  
G. Piccaluga ◽  
G. Pinna
Keyword(s):  
Aqueous Solution ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray

An EXAFS Investigation of Local Structure around Rb+ in Aqueous Solution

1994 ◽  
Vol 49 (6) ◽  
pp. 727-729 ◽  
Author(s):  
Yoshihiro Kubozono ◽  
Akiko Hirano ◽  
Hironobu Maeda ◽  
Setsuo Kashino ◽  
Shuichi Emura ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Coordination Number ◽  
Local Structure ◽  
The Other ◽  
Alkaline Metal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Exafs Spectra

Abstract EXAFS spectra have been measured in order to elucidate the local structure around Rb+ in aqueous solution. It has been found that the Rb+ is surrounded by ca. six O atoms of H2O molecules. The Rb -O distance was determined to be 2.90 (3) Å. The coordination number and Rb -O distance compare well with those of the other alkaline metal ions estimated by X-ray diffraction.

The sulphate ion in aqueous solution: an X-ray diffraction study of a ZnSO4solution

1982 ◽  
Vol 15 (6) ◽  
pp. 621-625 ◽  
Author(s):  
A. Musinu ◽  
G. Paschina ◽  
G. Piccaluga ◽  
M. Magini
Keyword(s):  
Aqueous Solution ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray
Sign in / Sign up

Export Citation Format

Share Document