6 research outputs found
Hydrocarbon-Soluble Nanocatalysts with No Bulk Phase: Coplanar, Two-Coordinate Arrays of the Base Metals
A structurally unique class of hydrocarbon-soluble,
ancillary-ligand-free,
tetrametallic Co(I) and Ni(I) clusters is reported. The highly unsaturated
complexes are supported by simple, sterically bulky phosphoranimide
ligands, one per metal. The electron-rich nitrogen centers are strongly
bridging but sterically limited to bimetallic interactions. The hydrocarbon-soluble
clusters consist of four coplanar metal centers, mutually bridged
by single nitrogen atoms. Each metal center is monovalent, rigorously
linear, and two-coordinate. The clusters are in essence two-dimensional
atomic-scale “molecular squares,” a structural motif
adapted from supramolecular chemistry. Both clusters exhibit high
solution-phase magnetic susceptibility at room temperature, suggesting
the potential for applications in molecular electronics. Designed
to be catalyst precursors, both clusters exhibit high activity for
catalytic hydrogenation of unsaturated hydrocarbons at low pressure
and temperature
Hydrocarbon-Soluble Nanocatalysts with No Bulk Phase: Coplanar, Two-Coordinate Arrays of the Base Metals
A structurally unique class of hydrocarbon-soluble,
ancillary-ligand-free,
tetrametallic Co(I) and Ni(I) clusters is reported. The highly unsaturated
complexes are supported by simple, sterically bulky phosphoranimide
ligands, one per metal. The electron-rich nitrogen centers are strongly
bridging but sterically limited to bimetallic interactions. The hydrocarbon-soluble
clusters consist of four coplanar metal centers, mutually bridged
by single nitrogen atoms. Each metal center is monovalent, rigorously
linear, and two-coordinate. The clusters are in essence two-dimensional
atomic-scale “molecular squares,” a structural motif
adapted from supramolecular chemistry. Both clusters exhibit high
solution-phase magnetic susceptibility at room temperature, suggesting
the potential for applications in molecular electronics. Designed
to be catalyst precursors, both clusters exhibit high activity for
catalytic hydrogenation of unsaturated hydrocarbons at low pressure
and temperature
Hydrocarbon-Soluble Nanocatalysts with No Bulk Phase: Coplanar, Two-Coordinate Arrays of the Base Metals
A structurally unique class of hydrocarbon-soluble,
ancillary-ligand-free,
tetrametallic Co(I) and Ni(I) clusters is reported. The highly unsaturated
complexes are supported by simple, sterically bulky phosphoranimide
ligands, one per metal. The electron-rich nitrogen centers are strongly
bridging but sterically limited to bimetallic interactions. The hydrocarbon-soluble
clusters consist of four coplanar metal centers, mutually bridged
by single nitrogen atoms. Each metal center is monovalent, rigorously
linear, and two-coordinate. The clusters are in essence two-dimensional
atomic-scale “molecular squares,” a structural motif
adapted from supramolecular chemistry. Both clusters exhibit high
solution-phase magnetic susceptibility at room temperature, suggesting
the potential for applications in molecular electronics. Designed
to be catalyst precursors, both clusters exhibit high activity for
catalytic hydrogenation of unsaturated hydrocarbons at low pressure
and temperature
Catalyst synthesis and evaluation using an integrated atomic layer deposition synthesis-catalysis testing tool.
An integrated atomic layer deposition synthesis-catalysis (I-ALD-CAT) tool was developed. It combines an ALD manifold in-line with a plug-flow reactor system for the synthesis of supported catalytic materials by ALD and immediate evaluation of catalyst reactivity using gas-phase probe reactions. The I-ALD-CAT delivery system consists of 12 different metal ALD precursor channels, 4 oxidizing or reducing agents, and 4 catalytic reaction feeds to either of the two plug-flow reactors. The system can employ reactor pressures and temperatures in the range of 10(-3) to 1 bar and 300-1000 K, respectively. The instrument is also equipped with a gas chromatograph and a mass spectrometer unit for the detection and quantification of volatile species from ALD and catalytic reactions. In this report, we demonstrate the use of the I-ALD-CAT tool for the synthesis of platinum active sites and Al2O3 overcoats, and evaluation of catalyst propylene hydrogenation activity