Synthese von Schwermetallkomplexen mit makrocyklischen Polyaethern als Liganden

Knöchel, A.; Klimes, J.; Oehler, J.; Rudolph, G.

doi:10.1016/0020-1650(75)80101-2

Cited by 26 publications

(5 citation statements)

References 10 publications

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“…Although the limited analytical data for this sample are far from satisfactory (two samples exploded during analysis for tin; oxygen cannot be adequately determined in the presence of heavy metals26), both the available results and the Mossbauer effect data indicate the presence of a single tin site in this complex. This observation is particularly tantalizing in view of the observations of Knochel et al 19 (vide supra), who noted in their study of heavy-metal complexation by polyethers that hydrated salts gave 1:1 complexes, while anhydrous salts (specifically CoCl2) gave rise to 2:1 complexes of metal to ligand. In the present study, this observation appears to be confirmed in the sense that the anhydrous tin(II) salts used as reactants have yielded 2:1 complexes while Sn(C104)2-3H20 results in a 1:1 complex, which, incidently, is free of waters of hydration as judged from the infrared data.…”

Section: Resultsmentioning

confidence: 63%

Synthesis, vibrational spectroscopy, and Moessbauer effect study of tin(II) complexes of crown ethers

Herber¹,

Carrasquillo²

1978

Inorg. Chem.

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The preparation, characterization, and infrared and u9Sn Mossbauer effect spectra for a number of Sn(II) complexes of cyclic polyethers are discussed. 18-Crown-6 forms a solid reaction product with anhydrous tin(II) chloride and tin(II) thiocyanate which contains two distinct tin sites per molecule. On the basis of isomer shift and quadrupole splitting systematics, the Móssbauer spectrum can be analyzed in terms of a cationic moiety, SnL+ (L = Cl or NCS), bonded to the crown ether, and an anionic moiety, SnL3", present as a gegenion. A very similar structure is postulated for the reaction product between dibenzo-18-crown-6 and tin(II) thiocyanate. By contrast, the reaction product obtained with 18-crown-6 and Sn(C104)2-3H20, contains only one tin site per molecule. This tin site is characterized by a sharp singlet Mossbauer spectrum and has an isomer shift which is among the most positive recorded for a tin(II) species. The infrared spectrum of this compound does not indicate the presence of waters of hydration. The temperature dependence of the Mossbauer recoil-free fraction for Sn(C104)2-3H20 and the tin(II) perchlorate-crown ether complex, as well as for the other products isolated in this study, is presented.

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Section: Resultsmentioning

confidence: 63%

Synthesis, vibrational spectroscopy, and Moessbauer effect study of tin(II) complexes of crown ethers

Herber¹,

Carrasquillo²

1978

Inorg. Chem.

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“…1). A more recent report (Kn6chel, Klimes, Oehler & Rudolph, 1975) described the formation of transitionmetal complexes of unsubstituted 18-crown-6; these * Transition-Metal-Crown Ether Complexes. I. t Current address: Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.…”

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confidence: 99%

Tetrahedral and octahedral cobalt(II) in hexaaquacobalt tetrachlorocobaltate–18-crown-6–acetone

Vance¹,

Holt²,

Pierpont³

et al. 1980

Acta Crystallogr Sect B

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“…It is unexpected that the picrate (Pi) and the 2,4-dinitrophenolate separate as homoconjugate salts from methanol or ethanol, as both ions are very poor hydrogen bond acceptors even in protophobic dipolar solvents. Knóchel et al (15) prepared crystalline salts of heavy metals (Ni, Co, Mn, Cd, Zn, Bi, U02, Ag) complexed with 18-crown-6, ©…”

Section: Macromonocyclic Compounds Crown Ethersmentioning

confidence: 99%

“…Tomaja (17) prepared several complexed uranyl chloride hydrates, LU02Cl2'3H20, L being 18-crown-6, 15-crown-5, and 12crown-4, and also some in the anhydrous form. Salts of cadmium iodide, bromide, and chloride with 18-crown-6 (18) and dibenzo-18-crown-6 and 15-crown-5 (19) as ligands have been prepared (17). In most salts, the Cd-L ratio was 1:1.…”

Section: Macromonocyclic Compounds Crown Ethersmentioning

confidence: 99%

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Application of macrocyclic compounds in chemical analysis

Kolthoff¹

1979

Anal. Chem.

254

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Macrocyclic compounds are uncharged and contain a cavity in which a cation can be encapsuled. The complexes thus formed are of great analytical interest, but relatively few papers dealing with these compounds have been published in analytical journals as compared to hundreds of publications in a variety of nonanalytical journals.In the present review and discussion, we will often refer to the macrocyclic compounds as ligands and denote them by the symbol L, while a complex with a cation Cn+ is denoted by LCn+.

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Synthese von Schwermetallkomplexen mit makrocyklischen Polyaethern als Liganden

Cited by 26 publications

References 10 publications

Synthesis, vibrational spectroscopy, and Moessbauer effect study of tin(II) complexes of crown ethers

Synthesis, vibrational spectroscopy, and Moessbauer effect study of tin(II) complexes of crown ethers

Tetrahedral and octahedral cobalt(II) in hexaaquacobalt tetrachlorocobaltate–18-crown-6–acetone

Application of macrocyclic compounds in chemical analysis

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