Consecutive fragmentations of the cubane-like zinc cluster [CH3Zn(O-i-C3H7)]4upon electron ionization

Schröder, Detlef; Schwarz, Helmut; Polarz, Sebastian; Drieß, Matthias

doi:10.1039/b415078c

Cited by 47 publications

(31 citation statements)

References 54 publications

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“…1a). [31,33,34] The latter results are the basis for the work presented here. Because quite high temperatures are applied in CVS but nanoscale particles are still obtained, the idea was that this would allow the preparation of stable but still very active ZnO sensors.…”

Section: Sensor Preparationmentioning

confidence: 89%

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Polarz

Roy

Lehmann

et al. 2007

Adv Funct Materials

107

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Chemical sensing on oxide sensors is a complex phenomenon involving catalytic activity as well as electronic properties. Thus, the properties of oxide sensors are highly sensitive towards structural changes. Effects like surface area, grain size, and, in addition, the occurrence of defects give separate contributions to the current. Structure–property–function relationships can be elucidated using a combination of state‐of‐the‐art analytical techniques. It is shown, that impurity atoms in the oxide lattice influence the performance of ZnO sensors more strongly than the other factors.

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Section: Sensor Preparationmentioning

confidence: 89%

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Polarz

Roy

Lehmann

et al. 2007

Adv Funct Materials

107

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“…[17,19] We tested our hypothesis whether the elimination of acetone is truly crucial for the formation of oxygen vacancies by comparison with a sample prepared from the tert-butoxy derivative [CH 3 ZnOC(CH 3 ) 3 ] 4 . Clearly, the elimination of an oxygen-containing leaving group from the tert-butoxy-substituted Zn 4 O 4 core is rather unlikely because no b hydrogen atom is present.…”

mentioning

confidence: 99%

“…We recently identified an organometallic precursor system from which ZnO can be prepared at temperatures as low as 150 8C. [16][17][18][19] These molecular precursors are characterized by a central Zn 4 O 4 heterocubane cluster and thus represent zinc oxide preorganized on the molecular scale. In Figure 1 a 4 is highly sensitive to kinetic factors in the decomposition process.…”

mentioning

confidence: 99%

On the Role of Oxygen Defects in the Catalytic Performance of Zinc Oxide

et al. 2006

Self Cite

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“…Mo 2 (O 2 CR) 4 compounds are kinetically labile to scrambling, and so in examining the thermotropic properties of mixtures of Mo 2 (O 2 CR) 4 and Mo 2 (O 2 CRЈ) 4 compounds, it was not surprising to find that properties of closely related R and RЈ e.g., an octanoate and a nonanoate, showed near ideal behavior and conformed to predictions based on the Shrodervan-Laar equation (10). However, mixtures of n-alkanoates and perf luoro-n-alkanoates showed markedly different properties (9).…”

Section: Mesogensmentioning

confidence: 98%

Metal to Metal Multiple Bonds in Ordered Assemblies

Chisholm¹

2007

ChemInform

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The synthesis and properties of metal-metal (MM) quadruply bonded compounds of molybdenum and tungsten in liquid crystalline phases are described. Covalently linked MM quadruply bonded complexes, dimers of dimers, are shown to give rise to mixed valence complexes upon oxidation and the degree of electron delocalization is shown to be correlated with the M 2␦ bridge interactions. Class III behavior or complete delocalization is observed to M 2 to M2 distances of up to 14 Å. When the M2 unit is attached to oligothiophenes via a carboxylate tether, the photophysical properties of the thienyl units are greatly modified due to M 2␦-thienyl conjugation and spin-orbit coupling. This leads to long-lived emissive states and electroluminescence in solid-state devices. 4 (1). If the MM axis is defined as the z axis, then the metal-ligand bonds can be considered to use metal s, p x , p y and d x2-y2 orbitals thus leaving the metal d z2 to form a bond, the degenerate d xz and d yz interact to form the bonds and lastly the d xy to form the ␦ bond which has two nodes intersecting along the MM axis. The dinuclear center is redox active and upon oxidation electrons are removed from the ␦ orbital to give MM configurations of 2 4 ␦ and 2 4 leading, respectively, to MM bond orders of 3.5 and 3. These compounds have challenged our understanding of chemical bonding and their attendant spectral features such as the assignment of (MM) or the ␦ to ␦* transition have often been the subject of intense debate (2-5). This article focuses on chemistry derived from M 2 (O 2 CR) 4 compounds, where M ϭ Mo and W, and covers work completed in my laboratory principally over the past decade.The M 2 (O 2 CR) 4 compounds can be viewed as coordinatively unsaturated in as much as the metal ions only attain a share of 16 valence electrons as a result of forming four metal-ligand bonds and the MM quadruple bond. By the use of the metal p z orbital (or an s, p z

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Consecutive fragmentations of the cubane-like zinc cluster [CH₃Zn(O-i-C₃H₇)]₄upon electron ionization

Cited by 47 publications

References 54 publications

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

Structure–Property–Function Relationships in Nanoscale Oxide Sensors: A Case Study Based on Zinc Oxide

On the Role of Oxygen Defects in the Catalytic Performance of Zinc Oxide

Metal to Metal Multiple Bonds in Ordered Assemblies

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