Spektroskopische Untersuchung der Dissoziationsverhältnisse von Blei- und Thallohalogeniden in wässeriger Lösung1

Fromherz, Hans; Lih, Kun-Hou

doi:10.1515/zpch-1931-15323

Cited by 44 publications

(5 citation statements)

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“…Complexes 2 and 3 are colorless, in contrast to 1 which is a yellow compound. The UV spectra of 2 ( c = 1.23 10 -5 M) and 3 ( c = 4.00 10 -5 M) in aqueous solution both display a band around 201−202 nm which is attributed to the free Pb 2+ ion . Obviously, the complexes dissociate at least partially at these low concentrations.…”

Section: Resultsmentioning

confidence: 92%

Synthesis of and Structural Studies on Lead(II) Cysteamin Complexes

Fleischer

Schollmeyer

2004

Inorg. Chem.

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The novel compounds PbCl(2).(SCH(2)CH(2)NH(3)) (1), Pb(SCH(2)CH(2)NH(2))(2).2PbCl(SCH(2)CH(2)NH(2)) (2), and Pb(SCH(2)CH(2)NH(2))(2) (3) were synthesized by reaction of PbO or PbCl(2) with [HSCH(2)CH(2)NH(3)]Cl and NaOH, and were characterized by elemental analysis, IR-, and UV/vis-spectroscopy. Single-crystal X-ray diffraction revealed different coordination modes for the two Pb atoms in 2. The Pb atom in the Pb(SCH(2)CH(2)NH(2))(2) unit forms two covalent Pb-S and two intramolecular dative Pb...N bonds, leading to a pseudo trigonal bipyramidal configuration with a stereochemically active lone pair. The Pb atom in the PbCl(SCH(2)CH(2)NH(2)) unit, the first moiety structurally characterized of the PbCl(SR) type (R = organic group), forms covalent Pb-Cl and Pb-S bonds, an intramolecular dative Pb...N bond, and two intermolecular Pb...S contacts, giving a pseudo octahedral configuration with a stereochemically active lone pair as well. Despite the Pb(SCH(2)CH(2)NH(2))(2) moiety exhibiting C(2) symmetry in 2, and C(1) symmetry in 3, its structural parameters are rather similar in the two compounds. The influence of the Pb...N bond on molecular structure and thermodynamic stability were estimated by means of quantum chemical ab initio methods. Although an analysis of the wave function in terms of natural bond orbitals (NBO) revealed that n(N) and n(p)(S) compete for the empty p-orbital of the Pb(II) atom, the sigma-type n(N)-6p(Pb) interaction is stronger than the pi-type n(p)(S)-6p(Pb) interaction and hence determines the conformation of the compounds.

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Section: Resultsmentioning

confidence: 92%

Synthesis of and Structural Studies on Lead(II) Cysteamin Complexes

Fleischer

Schollmeyer

2004

Inorg. Chem.

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“…While the theory of the electron-transfer quenching of fluorescence was mainly developed by Weiss (320,322) on the basis of the fundamental ideas of Franck and his school (145,148,158), the importance of the triplet state in dye-photosensitized reactions was recognized by Lewis and his coworkers (c/. review by Kasha ( 202)).…”

Section: Photoexcited Dyes and The Uranyl Ionmentioning

confidence: 99%

Inorganic Free Radicals in Solution.

Uri¹

1952

Chem. Rev.

268

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“…This is sometimes divided out to give approximately: log 7± = -2Ay/µ + 'µ (11) where B' = 2ABd. Substituting for log ± from equation 11 into equation 4 and rearranging terms gives:…”

Section: 8mentioning

confidence: 99%

“…E. C. Righellato and C. W. Davies (24) have studied the anomalous conductance of lead chloride solutions, and they have interpreted the results in terms of formation of PbCl+ complex ion. Independently, H. Fromherz and K. H. Lih (11) have studied the ultraviolet absorption spectra of these solutions, and also have obtained evidence for the formation of PbCl+ in dilute solutions.…”

Section: 8mentioning

confidence: 99%