<i>cyclo</i>‐As<sub>8</sub>, as Complex Ligand

Scherer, Otto J.; Winter, Rainer F.; Heckmann, Gert; Wolmershäuser, Gotthelf

doi:10.1002/anie.199108501

Cited by 24 publications

(22 citation statements)

References 10 publications

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“…A similar reaction of As 4 with the [Cp″Nb(CO) 4 ] performed at thermolytic conditions (decalin 170 °C) gave the complex [(Cp″Nb) 2 (μ,η 4:4 -As 8 )] (6.1-4). 109 This compound features a distorted As 8 ring coordinated to two NbCp″ fragments, representing the arsenic analogue of cyclooctatetraene. The reaction with [Cr(CO) 5 -(thf)] resulted in compound 6.1-5 wherein a Cr(CO) 5 fragment is coordinated by one As atom of the As 8 ring (Figure 8).…”

Section: Reactivity Of As 4 Toward Transition Metal Complexesmentioning

confidence: 99%

“…Complex 6.1-3 features a slightly distorted square-planar cyclo -As 4 unit with As–As distances between 2.345(4) and 2.409(4) Å (Figure ). A similar reaction of As 4 with the [Cp″Nb(CO) 4 ] performed at thermolytic conditions (decalin 170 °C) gave the complex [(Cp″Nb) 2 (μ,η 4:4 -As 8 )] ( 6.1-4 ) . This compound features a distorted As 8 ring coordinated to two NbCp″ fragments, representing the arsenic analogue of cyclooctatetraene.…”

Section: Reactivity Of As4 Toward Transition Metal Complexesmentioning

confidence: 99%

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The Chemistry of Yellow Arsenic

2019

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The generation and handling of the light-sensitive and metastable yellow arsenic (As4) is extremely challenging. In view of recent breakthroughs in synthesizing As4 storage materials and transfer reagents, the more intensive use of yellow arsenic as a source for further reactions can be expected. Given these aspects, the current stage of knowledge of the direct use of As4 is comprehensively summarized in the present review, which lists the activation of As4 by main group elements as well as transition metal compounds (including the f-block elements). Moreover, it also partly compares the reaction outcomes in relation to the corresponding reactions of P4. The possibility of using alternative sources for generating arsenic moieties and compounds is also discussed. The release of As4 molecules from precursor compounds and the use of transfer reagents for polyarsenic entities open up new synthetic pathways to avoid the direct generation of yellow arsenic solutions and to ensure its smooth usage for subsequent reactions.

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Section: Reactivity Of As 4 Toward Transition Metal Complexesmentioning

confidence: 99%

Section: Reactivity Of As4 Toward Transition Metal Complexesmentioning

confidence: 99%

The Chemistry of Yellow Arsenic

2019

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“…Looking closer to the area of the Erichest E n ligand complexes: for phosphorus [{(Bu 3 P) 2 Ni} 4 (P 14 )] is the largest one reported so far, synthesised by Fenske et al 13 using Li 3 P 7 as a phosphorus source. For arsenic, [(Cp Nb) 2 (cyclo-As 8 )] (Cp = g 5 -C 5 H 3 tBu 2 ) 14 is, so far, the largest arsenic-rich complex obtained by using yellow As 4 as starting material. For antimony, the cyclo-Sb 5 unit in [(Cp Mo) 2 (l,g 5 : g 5 -Sb 5 )] (Cp = g 5 -C 5 H 2 tBu 3 ) 15 is the largest 'naked' antimony moiety reported so far, synthesised by using (tBuSb) 4 as the antimony source.…”

Section: Introductionmentioning

confidence: 99%

The coordination chemistry of group 15 element ligand complexes—a developing area

Scheer

2008

Dalton Trans.

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A survey of the contemporary challenges of the field of unsubstituted group 15 element ligand complexes (excluding N) is given. The focus of the article is on the coordination chemistry behaviour of such E(n) ligand complexes. This field is subdivided into two areas of reactivity: E(n) ligand complexes with (i) noncoordinated Lewis-acidic cations and (ii) Lewis-acidic coordination compounds containing at least one permanently coordinating ligand. In the latter case, insoluble 1D and 2D polymers respectively are obtained; however, under special conditions soluble, spherical, fullerene-like giant molecules are formed. These nano-sized molecules are up to 2.4 nm in diameter and are able to encapsulate small molecules in their holes. In contrast, the first-mentioned field uses weakly coordinating anions to obtain readily soluble di- and polycationic products. These show depolymerisation tendencies in solution under the formation of oligomer-monomer equilibria and thus reveal dynamic supramolecular aggregation processes.

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“…Die Kristallstrukturanalyse [10] weist den Arsen-Achtring als das die Struktur pra È gende Geru È st aus. cyclo-As 8 , formal ein stark verzerrtes Arsen-Analogon des isovalenzelektronischen Cyclooctatetraens, (CH) 8 , bildet zu den Cp@Ta-Fragmenten eine l-g 4 : g 4 -As 8 -Koordination aus. Die sehr unterschiedlichen As±As-Bindungsla È ngen reichen von zwei sehr kurzen (2.371(2) A Ê , As3(3')±As 4 (4')) bis zu 2.537(2) A Ê (As1±As1' [14]).…”

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