scholarly journals Mixed ligand complexes of alkaline earth metals: Part XII. Mg(II), Ca(II), Sr(II) and Ba(II) complexes with 5-chlorosalicylaldehyde and salicylaldehyde or hydroxyaromatic ketones

2002 ◽  
Vol 67 (4) ◽  
pp. 229-234 ◽  
Author(s):  
R.N. Prasad ◽  
M. Agrawal ◽  
M. Sharma
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Mixed Ligand ◽  
Alkaline Earth Metals ◽  
1H Nmr Spectra ◽  
Mixed Ligand Complexes ◽  
Alkaline Earth Metal ◽  
Metal Chlorides

The reactions of alkaline earth metal chlorides with 5-chlorosalicylaldehyde and salicylaldehyde, 2-hydroxyacetophenone or 2-hydroxypropiophenone have been carried out in 1: 1: 1 mole ratio and the mixed ligand complexes of the type MLL?(H2O)2 (where M = Mg(II), Ca(II), Sr(II) and Ba(II),HL= 5-chlorosalicylaldehyde and HL?= salicylaldehyde, 2-hydroxyacetophenone or 2-hydroxypropiophenone) have been isolated. These complexes were characterized by TLC, conductance measurements, IR and 1H-NMR spectra.

Alkaline Earth Metal Organoamide Complexes Displaying Close Ae–F(C) (Ae = Ca, Mg) Interactions

2013 ◽  
Vol 66 (10) ◽  
pp. 1288 ◽  
Author(s):  
Glen B. Deacon ◽  
Peter C. Junk ◽  
Rory P. Kelly
Keyword(s):  
Crystal Structures ◽  
1H Nmr ◽  
Low Temperatures ◽  
Nmr Spectra ◽  
Alkaline Earth ◽  
Earth Metal ◽  
1H Nmr Spectra ◽  
Alkaline Earth Metal ◽  
X Ray ◽  
Bond Lengths

Protolysis of [Ca{N(SiMe3)2(thf)2] (thf = tetrahydrofuran) with the N,N-dialkyl-N′-2,3,5,6-tetrafluorophenylethane-1,2-diamines, p-HC6F4NH(CH2)2NR2 (LRH; R = Me or Et), yields [Ca(p-HC6F4N(CH2)2NR2)2(thf)2], whilst protolysis of di-n-butylmagnesium by the same amines yields [Mg(p-HC6F4N(CH2)2NR2)2] complexes. X-Ray crystal structures show that the calcium derivatives contain eight-coordinate calcium atoms, with tridentate (N,N′,o-F) coordination of the organoamide ligands and cisoid thf donors. It is noteworthy that the Ca–F(C) bond lengths are shorter than the Ca–NR2 bond lengths. By contrast, magnesium forms centrosymmetric, six-coordinate, homoleptic complexes, in which the Mg–NR2 bond lengths are shorter than the Mg–F(C) bond lengths. 19F{1H} NMR spectra of the R = Me complexes support retention of Ae–F(C) linkages in solution at low temperatures. Heating the complexes for a prolonged period in C6D6 at 80°C showed no evidence of C–F activation reactions.

scholarly journals Synthesis and Spectroscopic Studies of New Palladium(II) Complexes of N-hydroxymethyl Saccharin (Sac-CH2OH) and Amines or Diaminas Ligands

2019 ◽  
Vol 35 (1) ◽  
pp. 186-192 ◽  
Author(s):  
Ahmed S. Al-Janabi ◽  
Adnan A. Al-Dulaimi ◽  
Hayfa M. Gergees ◽  
Mohammed H. Saleh
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Spectroscopic Studies ◽  
Mixed Ligand ◽  
1H Nmr Spectra ◽  
Ethylene Diamine ◽  
Mixed Ligand Complexes ◽  
Conductivity Measurements

Treatment of the chelated palladium(II) complex, trans-[Pd(K2-Sac-CH2O)2].2H2O with one mole equivalent of the diammines (L-L), L-L = 2,2'-bipyridine (bipy),. ethylene diamine (en), 1,10-phenanthroline (phen), or N,N-dimethyl ethylene diammine (dmen) in EtOH solvent afforded mixed ligand complexes of the type [Pd(K1-Sac-CH2O)2(L-L)] in 82-93% yield. While treatment of trans-[Pd(K2-Sac-CH2O)2].2H2O with two mole equivalents of the monoamines (L), L=pyridine (py), 3-methylpyridine (3-mpy) or 3-aminopyridine (3-apy) in EtOH solvent gave trans-[Pd(K1-Sac-CH2O)2(L)2] complexes in 86-89% yield The prepared complexes were characterized by elemental CHN analysis, .conductivity measurements,. infrared and 1H nmr spectra.

Mixed-ligand complexes of alkaline-earth metal trifluoroacetates with monoethanolamine

2010 ◽  
Vol 36 (11) ◽  
pp. 804-809 ◽  
Author(s):  
A. V. Kharchenko ◽  
A. M. Makarevich ◽  
K. A. Lysenko ◽  
N. P. Kuzmina
Keyword(s):  
Alkaline Earth ◽  
Earth Metal ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Alkaline Earth Metal ◽  
Metal Trifluoroacetates

scholarly journals Thermodynamic Stability Areas of Polyvanadates of Alkaline Earth Metals

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Igor Povar ◽  
Inga Zinicovscaia ◽  
Oxana Spinu ◽  
Boris Pintilie
Keyword(s):  
Thermodynamic Stability ◽  
Metal Ion ◽  
Alkaline Earth ◽  
Heterogeneous Systems ◽  
Earth Metal ◽  
Thermodynamic Characteristics ◽  
Alkaline Earth Metals ◽  
Alkaline Earth Metal ◽  
Solution Ph ◽  
Alkaline Earth Element

A thermodynamic method of the global Gibbs energy variation calculation for describing heterogeneous equilibria of transformations of calcium, strontium, and barium polyvanadates, that occur in systems MeO-V2O5-H2O, where Me is the alkaline earth element, has been developed and used. Its quintessence consists in the thermodynamic analysis of the real conditions of various processes on the basis of their total thermodynamic characteristics. On the basis of the selected thermodynamic data for involved species, the thermodynamic stability areas of solid polyvanadates towards the solution pH and vanadium and alkaline earth metal ion concentrations in heterogeneous mixtures have been established, taking into account the complex formation reactions in multicomponent heterogeneous systems. The existing experimental data confirm the results on the thermodynamic stability of polyvanadates obtained in this paper.

scholarly journals Die Kristallstrukturen von Strontium- und Bariumhexacyanoferrat(III)-Hexamethylentetramin-Hydraten. Strukturmodell für Additionsverbindungen der Alkali- und Erdalkalimetallhexacyanoferrate mit Hexamethylentetramin / The Crystal Structures of Hydrates of Strontium and Barium Hexacyanoferrate(III) with Hexamethylenetetramine. Structural Model for Adducts of the Hexacyanoferrates of Alkaline and Alkaline Earth Metals with Hexamethylenetetramine

1989 ◽  
Vol 44 (5) ◽  
pp. 519-525 ◽  
Author(s):  
Hans-Jürgen Meyer ◽  
Joachim Pickardt
Keyword(s):  
Aqueous Solutions ◽  
Crystal Structures ◽  
General Formula ◽  
Alkaline Earth ◽  
Structural Model ◽  
Earth Metal ◽  
Alkaline Earth Metals ◽  
Alkaline Earth Metal ◽  
Monoclinic Space Group ◽  
Space Group

By reaction of methanolic solutions of hexamethylenetetramine with aqueous solutions of hexacyanoferrates(III) of strontium and barium resp., crystals of the compounds were obtained. Sr3[Fe(CN)6]2 · 3 C6H12N4 · 18 H2O, tetragonal, space group P42/nmc, Z = 4, a = 1931.8(4), c = 1579.9(4) pm, 1358 reflections. R = 0.066. Ba3[Fe(CN)6]2 · 2 C6H12N4 · 11 Η2Ο. monoclinic. space group P21/n, Ζ = 2, a = 1148.0(4), b = 1369.7(4), c = 1584.5(4) pm, γ = 95.79(3)°, 2583 reflections, R = 0.057. The crystal structures of these adducts are compared with those of other hexamethylenetetramine adducts of alkaline and alkaline earth metal hexacyanoferrates of the general formula M,[Fe(CN)6]y · zC6H12N4 · vH2O recently investigated by us. A structural model for the adducts is presented.

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