Oxygen, sulfur, selenium, tellurium and polonium

Martin, Caleb D.; Ragogna, Paul J.

doi:10.1039/c1ic90020j

Cited by 8 publications

(3 citation statements)

References 88 publications

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“…For an understanding of the role and importance of intermolecular interactions involving chalcogens, the atom selenium represents an ideal option because it plays an important role in chemistry as well as in biology. Selenium is a very important member of the chalcogen family because it has a soft metal-like behavior and also due to its applications in ligand chemistry − and asymmetric synthesis. − Also synthesis and biological applications of organoselenium have been well researched and documented. − Selenium also plays a very important role in immune system, − selenoproteins, − and cancer therapy. , On account of the immense potential and applications in the chemical and biological word, it was of interest to explore the formation of noncovalent bonds involving selenium.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Role of Substitution on the Formation of Se···O/N Noncovalent Bonds

Shukla

Chopra

2015

J. Phys. Chem. B

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In this article, we have examined the effect of substitution on the formation of neutral XHSe···O/N (X = -H, -F, -CH3, -CF3, -Cl, -OH, -OCH3, -NH2, -NHCH3, -CN) noncovalent bonds with the oxygen atom from H2O molecule and the nitrogen atom from NH3 being the electron donor atoms, respectively. In addition to this, analysis has also been performed on XMeSe···O/N complexes to study the effect of the role of hydrogen bonding with the hydrogen atoms of the methyl group on Se···O/N interactions. Binding energy calculations were performed to determine the strength of these contacts. The obtained results establish the fact that the presence of a methyl group influences the strength of the observed Se···O/N interactions. Also in some cases, the O-H···Se interaction was observed to be more preferable over the Se···O interaction. The major contribution for stabilization of such Se···O/N interactions is from an interplay among the electrostatics and the exchange energy. To obtain deeper insights and understanding of such Se···O/N contacts, a topological analysis, using the QTAIM approach were also performed. This analysis showed that although the presence of a Me group modifies the Se···O/N interaction, it does not necessitate the formation of hydrogen bonds. To obtain insights into the orbital contributions, a natural bond orbital (NBO) analysis were performed which depicts that the strength of such interactions were derived via charge transfer from the oxygen/nitrogen lone pair to the σ* orbital of the Se-X bond.

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Section: Introductionmentioning

confidence: 99%

Exploring the Role of Substitution on the Formation of Se···O/N Noncovalent Bonds

Shukla

Chopra

2015

J. Phys. Chem. B

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“…The latter included solvated telluride salts. Since then, a large progress has been made in the area of non‐classical tellurides, including one, two and three‐dimensional telluride architectures,2f,4a,4b rings and cage formations,4c heterometallic, macrocyclic and carbene analogeous tellurium compounds4d,4e,4f,4g as well as the syntheses of a large variety of telluronium, tellurolate,4h,4i and polycationic tellurium salts 4j,4k,4l,4m. Nevertheless, the total number of so‐called “organic cation” tellurides, which contain either alkali metal or alkaline‐earth metal cations in solvent, crown ether or cryptand complexes, or ammonium or phosphonium ions, is still small.…”

Section: Introductionmentioning

confidence: 99%

Syntheses, Structures, and Electronic Properties of a New Series of Tellurides of the Type [Sequestered Cation]₂(Te_x) (x = 1–4)

Thiele

Lichtenberger

Tonner

et al. 2013

Zeitschrift anorg allge chemie

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The list of "classical" tellurides with organic cations was expanded by the synthesis of single-crystalline salts [Li 2 (en) n ](Te x ) (en = ethylenediamine) with n = 4, x = 1 (1), n = 4, x = 2 (2), and n = 5, x = 3 (3), [K(18c6)] 2 (Te x ) (18c6 = 1,4,7,10,13,16-hexaoxacyclooctadecane) with x = 2 (4), 4 (5), [K(18c6)] 2 [K(en)] 2 (Te 2 ) 2 (6), and [K([2.2.2]crypt)] 2 (Te 2 ) (7) ([2.2.2]crypt = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]-hexacosane). Electronic structure calculations * Prof. Dr. S. Dehnen 2809on free molecules and periodic approaches are discussed and compared with experimental UV/Vis spectra, providing a correlation of the bandgaps with the telluride chain length, and a possibility for affecting the gap by according choice of the counterions. Additionally, 125 Te NMR chemical shifts of the presented series of en solvated lithium tellurides are presented.

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“…In the past decade, there has been an interest in synthesizing monocationic and polycationic main group centered molecules to study the nature of their structure, bonding, and reactivity. Although there are a variety of synthetic methods used to produce these species, nitrogen-based ligands have been the dominant support for the cations. , Many of the reports have focused on producing novel complexes using ligands where the substituents (alkyl or aryl) can be varied within the ligand framework; however, examples of these common supports that feature pendant redox active (i.e., ferrocene) fragments are relatively rare (Figure ). It is known that transition metal based complexes containing redox active ligands or ligands substituted with redox active components have been used in a diverse array of applications including catalysis, optical materials, or in the manufacture of biological sensors. − The appeal of ligands with redox active functional groups stems from their ability to change the electronic properties of the central metal without the need for further synthetic modifications.…”

Section: Introductionmentioning

confidence: 99%

The Syntheses and Electrochemical Studies of a Ferrocene Substituted Diiminopyridine Ligand and Its P, S, Se, and Te Complexes

et al. 2012

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A new reversible, redox active diiminopyridine ligand (1Fc) containing pendant ferrocene functionalities was isolated and fully characterized. The reaction of 1Fc with chalcogen pseudohalides of sulfur, selenium, and tellurium yielded the respective N,N',N″-chelated chalcogen dications. Phosphorus chemistry proceeded in a related manner but, in this case, by the direct addition of 1Fc with PI(3) to yield the N,N',N″-chelated P(I) cation. These species represent the first synthesized main group complexes involving a redox active diiminopyridine ligand containing pendant ferrocenes. Electrochemical studies of the free ligand shows a reversible two-electron process. The chelated phosphorus cation, however, displayed three events, the first being a quasi-reversible two-electron process, involving the oxidation at the P(I) center, resulting in a P(III) cation. The subsequent reversible one- and two-electron processes arise from the ligand framework and pendant ferrocenes, respectively.

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Oxygen, sulfur, selenium, tellurium and polonium

Cited by 8 publications

References 88 publications

Exploring the Role of Substitution on the Formation of Se···O/N Noncovalent Bonds

Exploring the Role of Substitution on the Formation of Se···O/N Noncovalent Bonds

Syntheses, Structures, and Electronic Properties of a New Series of Tellurides of the Type [Sequestered Cation]₂(Te_x) (x = 1–4)

The Syntheses and Electrochemical Studies of a Ferrocene Substituted Diiminopyridine Ligand and Its P, S, Se, and Te Complexes

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Oxygen, sulfur, selenium, tellurium and polonium

Cited by 8 publications

References 88 publications

Exploring the Role of Substitution on the Formation of Se···O/N Noncovalent Bonds

Exploring the Role of Substitution on the Formation of Se···O/N Noncovalent Bonds

Syntheses, Structures, and Electronic Properties of a New Series of Tellurides of the Type [Sequestered Cation]2(Tex) (x = 1–4)

The Syntheses and Electrochemical Studies of a Ferrocene Substituted Diiminopyridine Ligand and Its P, S, Se, and Te Complexes

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Syntheses, Structures, and Electronic Properties of a New Series of Tellurides of the Type [Sequestered Cation]₂(Te_x) (x = 1–4)