Andreas Purath - Academia.edu (original) (raw)
Papers by Andreas Purath
Inorg Chem, 2001
A disproportionation process of a metastable AlCl solution with a simultaneous ligand exchange-Cl... more A disproportionation process of a metastable AlCl solution with a simultaneous ligand exchange-Cl is substituted by N(SiMe(3))(2)-leads to a [Al(69)[N(SiMe(3))(2)](18)](3-) cluster compound that can be regarded as an intermediate on the way to bulk metal formation. The cluster was characterized by an X-ray crystal structural analysis. Regarding its structure and the packing within the crystal, this metalloid cluster with 4 times more Al atoms than ligands is compared to the [Al(77)N(SiMe(3))(2)](20)](2-) cluster that has been published four years ago. Although there is a similar packing density of the Al atoms in both clusters as well as in Al metal, the X-ray structural analysis shows significant differences in topology and distance proportions. The differences between these-at a first glance almost identical-Al clusters demonstrate that results of physical measuring, e.g., of nanostructured surfaces which carry supposedly identical cluster species, have to be interpreted with great caution.
Angewandte Chemie, 1999
Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyld... more Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyldigallanyl R*3 Ga2 (ein bei Raumtemperatur metastabiles Folgeprodukt des Digallans R*4 Ga2) in Heptan bei 1008C in Tetrasupersilyl-tetrahedro-tetraalan 1a bzw. -tetragallan 1b, wogegen die ...
Organometallics, 1998
... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t... more ... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t-Bu 3 SiNa was prepared ... investigation concerning the preparation and the constitution of {Al 4 O 4 [Si(t-Bu) 3 ] 4 } is under way: Amelunxen, K.; Ecker, A.; Nöth, H.; Schwenk, H.; Schnöckel ...
Laser Technik Journal, 2010
Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking... more Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking for new methods and cell concepts to reduce production costs and increase cell efficiency. Developments which have been of more academic interest over the past years are close to find their way into volume production. While laser applications are already standard for structuring of thin film PV glass panels, they are not yet widely established in the silicon-wafer-based cell manufacturing, which still represents more than 80% of the photovoltaic market. However, without adding too much complexity to the process flow most of the new cell concepts are only feasible by introduction of laser processes.
Laser Technik Journal, 2010
Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking... more Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking for new methods and cell concepts to reduce production costs and increase cell efficiency. Developments which have been of more academic interest over the past years are close to find their way into volume production. While laser applications are already standard for structuring of thin film PV glass panels, they are not yet widely established in the silicon-wafer-based cell manufacturing, which still represents more than 80% of the photovoltaic market. However, without adding too much complexity to the process flow most of the new cell concepts are only feasible by introduction of laser processes.
Zeitschrift für anorganische und allgemeine Chemie, 1999
ABSTRACT
Organometallics, 1998
... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t... more ... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t-Bu 3 SiNa was prepared ... investigation concerning the preparation and the constitution of {Al 4 O 4 [Si(t-Bu) 3 ] 4 } is under way: Amelunxen, K.; Ecker, A.; Nöth, H.; Schwenk, H.; Schnöckel ...
Journal of the American Chemical Society, 2000
A metastable AlCl solution obtained by co-condensation of the high-temperature molecule AlCl and ... more A metastable AlCl solution obtained by co-condensation of the high-temperature molecule AlCl and a mixture of toluene/diethyl ether reacted with SiCp* 2 or SiCl 4 /AlCp*, giving a unique SiAl 14 cluster species that bears six Cp* ligands protecting the compound from disproportionation and formation of the bulk material (elemental Al or an Si/Al alloy). The structure of the SiAl 14 core represents a section of the bodycentered packing where a Si atom resides in the center of an Al cube. Each of the six faces of the cube is capped by an additional Al(η 5 Cp*) moiety. This cluster compound was investigated by mass spectrometry, X-ray diffraction, 27 Al NMR spectroscopy, and ab initio theory. The solid-state structure contains minor amounts of molecules with additional Cl atoms bonded to the Al atoms at the corners of the cube, and the presence of Cl-containing molecules in the crystal is rationalized on basis of the suggested reaction path.
![Research paper thumbnail of Tetrakis[tris(trimethylsilyl)silylaluminium(I)] Al4[Si(SiMe3)3]4—eine siliziumreicheVerbindung mit zentralem tetraedrischem Al4-Kern](https://attachments.academia-assets.com/53132463/thumbnails/1.jpg)
](Journal of Organometallic Chemistry, 1999
The first neutral aluminium(I) compound
Journal of Organometallic Chemistry, 1999
In order to investigate the bonding of the carbene-like ligand AlCp* towards a transition metal, ... more In order to investigate the bonding of the carbene-like ligand AlCp* towards a transition metal, the compound Cp*AlCr(CO) 5 has been prepared starting from Cr(CO) 5 COT and AlCp*. With the help of its crystal structure, some IR spectroscopic data and ab initio calculations, the Al-Cr bonding is discussed. The strong reducing ability of AlCp* leads to a shift in electron density towards the chromium atom and finally to the CO ligands.
Chemical Communications, 1999
ABSTRACT
Angewandte Chemie, 1999
Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyld... more Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyldigallanyl R*3 Ga2 (ein bei Raumtemperatur metastabiles Folgeprodukt des Digallans R*4 Ga2) in Heptan bei 1008C in Tetrasupersilyl-tetrahedro-tetraalan 1a bzw. -tetragallan 1b, wogegen die ...
Angewandte Chemie, 1999
ABSTRACT
Angewandte Chemie International Edition, 1999
A doubly capped In(6) octahedron characterizes the structure of the dark green octaindane (tBu(3)... more A doubly capped In(6) octahedron characterizes the structure of the dark green octaindane (tBu(3)Si)(6)In(8) (see picture), which is obtained from (C(5)Me(5))In and tBu(3)SiNa in pentane at -78 degrees C. In1/In1' are the capping atoms, and In2/In2' form the apexes of the stretched In(6) octahedron. Thus, in agreement with the results of ab initio calculations, the compound can be classified as a hypoprecloso-indane.
Angewandte Chemie International Edition, 1999
ABSTRACT
European Journal of Inorganic Chemistry, 2002
ABSTRACT
Inorg Chem, 2001
A disproportionation process of a metastable AlCl solution with a simultaneous ligand exchange-Cl... more A disproportionation process of a metastable AlCl solution with a simultaneous ligand exchange-Cl is substituted by N(SiMe(3))(2)-leads to a [Al(69)[N(SiMe(3))(2)](18)](3-) cluster compound that can be regarded as an intermediate on the way to bulk metal formation. The cluster was characterized by an X-ray crystal structural analysis. Regarding its structure and the packing within the crystal, this metalloid cluster with 4 times more Al atoms than ligands is compared to the [Al(77)N(SiMe(3))(2)](20)](2-) cluster that has been published four years ago. Although there is a similar packing density of the Al atoms in both clusters as well as in Al metal, the X-ray structural analysis shows significant differences in topology and distance proportions. The differences between these-at a first glance almost identical-Al clusters demonstrate that results of physical measuring, e.g., of nanostructured surfaces which carry supposedly identical cluster species, have to be interpreted with great caution.
Angewandte Chemie, 1999
Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyld... more Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyldigallanyl R*3 Ga2 (ein bei Raumtemperatur metastabiles Folgeprodukt des Digallans R*4 Ga2) in Heptan bei 1008C in Tetrasupersilyl-tetrahedro-tetraalan 1a bzw. -tetragallan 1b, wogegen die ...
Organometallics, 1998
... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t... more ... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t-Bu 3 SiNa was prepared ... investigation concerning the preparation and the constitution of {Al 4 O 4 [Si(t-Bu) 3 ] 4 } is under way: Amelunxen, K.; Ecker, A.; Nöth, H.; Schwenk, H.; Schnöckel ...
Laser Technik Journal, 2010
Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking... more Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking for new methods and cell concepts to reduce production costs and increase cell efficiency. Developments which have been of more academic interest over the past years are close to find their way into volume production. While laser applications are already standard for structuring of thin film PV glass panels, they are not yet widely established in the silicon-wafer-based cell manufacturing, which still represents more than 80% of the photovoltaic market. However, without adding too much complexity to the process flow most of the new cell concepts are only feasible by introduction of laser processes.
Laser Technik Journal, 2010
Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking... more Driven by falling prices and competitive pressure manufacturers of photovoltaic cells are seeking for new methods and cell concepts to reduce production costs and increase cell efficiency. Developments which have been of more academic interest over the past years are close to find their way into volume production. While laser applications are already standard for structuring of thin film PV glass panels, they are not yet widely established in the silicon-wafer-based cell manufacturing, which still represents more than 80% of the photovoltaic market. However, without adding too much complexity to the process flow most of the new cell concepts are only feasible by introduction of laser processes.
Zeitschrift für anorganische und allgemeine Chemie, 1999
ABSTRACT
Organometallics, 1998
... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t... more ... t-Bu) 3 ] 4 (2). A solid mixture of 73 mg (0.29 mmol) of AlI·NEt 3 and 64 mg (0.29 mmol) of t-Bu 3 SiNa was prepared ... investigation concerning the preparation and the constitution of {Al 4 O 4 [Si(t-Bu) 3 ] 4 } is under way: Amelunxen, K.; Ecker, A.; Nöth, H.; Schwenk, H.; Schnöckel ...
Journal of the American Chemical Society, 2000
A metastable AlCl solution obtained by co-condensation of the high-temperature molecule AlCl and ... more A metastable AlCl solution obtained by co-condensation of the high-temperature molecule AlCl and a mixture of toluene/diethyl ether reacted with SiCp* 2 or SiCl 4 /AlCp*, giving a unique SiAl 14 cluster species that bears six Cp* ligands protecting the compound from disproportionation and formation of the bulk material (elemental Al or an Si/Al alloy). The structure of the SiAl 14 core represents a section of the bodycentered packing where a Si atom resides in the center of an Al cube. Each of the six faces of the cube is capped by an additional Al(η 5 Cp*) moiety. This cluster compound was investigated by mass spectrometry, X-ray diffraction, 27 Al NMR spectroscopy, and ab initio theory. The solid-state structure contains minor amounts of molecules with additional Cl atoms bonded to the Al atoms at the corners of the cube, and the presence of Cl-containing molecules in the crystal is rationalized on basis of the suggested reaction path.
Journal of Organometallic Chemistry, 1999
The first neutral aluminium(I) compound
Journal of Organometallic Chemistry, 1999
In order to investigate the bonding of the carbene-like ligand AlCp* towards a transition metal, ... more In order to investigate the bonding of the carbene-like ligand AlCp* towards a transition metal, the compound Cp*AlCr(CO) 5 has been prepared starting from Cr(CO) 5 COT and AlCp*. With the help of its crystal structure, some IR spectroscopic data and ab initio calculations, the Al-Cr bonding is discussed. The strong reducing ability of AlCp* leads to a shift in electron density towards the chromium atom and finally to the CO ligands.
Chemical Communications, 1999
ABSTRACT
Angewandte Chemie, 1999
Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyld... more Wie wir kürzlich mitteilten,[1] verwandeln sich Tetrasuper-silyldialan R*4 Al2 und Trisupersilyldigallanyl R*3 Ga2 (ein bei Raumtemperatur metastabiles Folgeprodukt des Digallans R*4 Ga2) in Heptan bei 1008C in Tetrasupersilyl-tetrahedro-tetraalan 1a bzw. -tetragallan 1b, wogegen die ...
Angewandte Chemie, 1999
ABSTRACT
Angewandte Chemie International Edition, 1999
A doubly capped In(6) octahedron characterizes the structure of the dark green octaindane (tBu(3)... more A doubly capped In(6) octahedron characterizes the structure of the dark green octaindane (tBu(3)Si)(6)In(8) (see picture), which is obtained from (C(5)Me(5))In and tBu(3)SiNa in pentane at -78 degrees C. In1/In1' are the capping atoms, and In2/In2' form the apexes of the stretched In(6) octahedron. Thus, in agreement with the results of ab initio calculations, the compound can be classified as a hypoprecloso-indane.
Angewandte Chemie International Edition, 1999
ABSTRACT
European Journal of Inorganic Chemistry, 2002
ABSTRACT