scholarly journals Kinetic versus thermodynamic metalation enables synthesis of isostructural homo- and heterometallic trinuclear clusters

2020 ◽  
Vol 56 (44) ◽  
pp. 5893-5896
Author(s):  
Sung-Min Hyun ◽  
Apoorva Upadhyay ◽  
Anuvab Das ◽  
Corey P. Burns ◽  
Siyoung Sung ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Temperature Dependent ◽  
Trinuclear Clusters

Temperature-dependent metalation of a new hexadentate enables the selective synthesis of both mononuclear (i.e. kinetic product) and trinuclear (i.e. thermodynamic product) complexes.

scholarly journals Kinetic Versus Thermodynamic Metalation Enables Synthesis of Isostructural Homo- and Heterometallic Trinuclear Clusters

2020 ◽  
Author(s):  
Sung-Min Hyun ◽  
Apoorva Upadhyay ◽  
Anuvab Das ◽  
Corey Burns ◽  
Siyoung Sung ◽  
...  
Keyword(s):  
Cluster Expansion ◽  
Metal Clusters ◽  
Systematic Variation ◽  
Selective Synthesis ◽  
Temperature Dependent ◽  
Ion Content ◽  
Trinuclear Complexes ◽  
Trinuclear Clusters ◽  
Hexadentate Ligand ◽  
Programmed Assembly

Temperature-dependent metalation of the new hexadentate ligand (tris(5-(pyridin-2-yl)-1<i>H</i>-pyrrol-2-yl)methane; H<sub>3</sub>TPM) enables the selective synthesis of both mononuclear (<i>i.e. </i>Na(THF)<sub>4</sub>[Fe(TPM)], kinetic product) and trinuclear (<i>i.e.</i> Fe<sub>3</sub>(TPM)<sub>2</sub>, thermodynamic product) complexes. Exposure of Na(THF)<sub>4</sub>[Fe(TPM)] to FeCl<sub>2</sub> or ZnCl<sub>2</sub> triggers cluster expansion to generate homo- or heterometallic trinuclear complexes, respectively. The developed approach enables systematic variation of ion content in isostructural metal clusters via programmed assembly.

scholarly journals Kinetic Versus Thermodynamic Metalation Enables Synthesis of Isostructural Homo- and Heterometallic Trinuclear Clusters

2020 ◽  
Author(s):  
Sung-Min Hyun ◽  
Apoorva Upadhyay ◽  
Anuvab Das ◽  
Corey Burns ◽  
Siyoung Sung ◽  
...  
Keyword(s):  
Cluster Expansion ◽  
Metal Clusters ◽  
Systematic Variation ◽  
Selective Synthesis ◽  
Temperature Dependent ◽  
Ion Content ◽  
Trinuclear Complexes ◽  
Trinuclear Clusters ◽  
Hexadentate Ligand ◽  
Programmed Assembly

Temperature-dependent metalation of the new hexadentate ligand (tris(5-(pyridin-2-yl)-1<i>H</i>-pyrrol-2-yl)methane; H<sub>3</sub>TPM) enables the selective synthesis of both mononuclear (<i>i.e. </i>Na(THF)<sub>4</sub>[Fe(TPM)], kinetic product) and trinuclear (<i>i.e.</i> Fe<sub>3</sub>(TPM)<sub>2</sub>, thermodynamic product) complexes. Exposure of Na(THF)<sub>4</sub>[Fe(TPM)] to FeCl<sub>2</sub> or ZnCl<sub>2</sub> triggers cluster expansion to generate homo- or heterometallic trinuclear complexes, respectively. The developed approach enables systematic variation of ion content in isostructural metal clusters via programmed assembly.

ChemInform Abstract: Temperature Dependent Selective Synthesis of Linear 2-Bromo and 2-Alkoxyfuro[2,3-b]quinolines: Reaction of 3-(2,2-Dibromovinyl-)quinolin-2(1H)-ones with Alcoholic KOH.

ChemInform ◽  
2015 ◽  
Vol 46 (15) ◽  
pp. no-no
Author(s):  
Durgesh Nandini ◽  
Mrityunjaya Asthana ◽  
Kalpana Mishra ◽  
R. P. Singh ◽  
Radhey M. Singh
Keyword(s):  
Selective Synthesis ◽  
Temperature Dependent

Temperature dependent selective synthesis of linear 2-bromo and 2-alkoxyfuro[2,3-b]quinolines: reaction of 3-(2,2-dibromovinyl-)quinolin-2(1H)-ones with alcoholic KOH

2014 ◽  
Vol 55 (45) ◽  
pp. 6257-6262 ◽  
Author(s):  
Durgesh Nandini ◽  
Mrityunjaya Asthana ◽  
Kalpana Mishra ◽  
R.P. Singh ◽  
Radhey M. Singh
Keyword(s):  
Selective Synthesis ◽  
Temperature Dependent

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

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