- Full text PDF available (5)
- This year (4)
- Last 5 years (6)
- Last 10 years (12)
Journals and Conferences
In enzymes, the electronic and steric environments of active centres, and therefore their activity in biological processes, are controlled by the surrounding amino acids. In a similar manner, organic ligands have been used for the 'passivation' of metal clusters, that is, inhibition of their aggregation and control of their environment. However, the ability… (More)
A closed Ir4 carbonyl cluster, 1, comprising a tetrahedral metal frame and three sterically bulky tert-butyl-calixarene(OPr)3(OCH2PPh2) (Ph = phenyl; Pr = propyl) ligands at the basal plane, was characterized with variable-temperature 13C NMR spectroscopy, which show the absence of scrambling of the CO ligands at temperatures up to 313 K. This… (More)
Isolated and patterned assemblies of Ir(4)-based metal polyhedra are described, in which a coordinated calixarene phosphine ligand enforces the desired cluster organization. The compounds are characterized by single-crystal X-ray diffraction and infrared spectroscopy.
We investigate the synthesis of accessible calixarene-bound gold clusters consisting of open "coordinatively unsaturated" active sites, using a comparative approach that relies on calixarene ligands with various upper- and lower-rim substituents. In contrast with a reported Au(I)-tert-butyl-calixarene phosphine complex, which exhibits a single cone… (More)
The synthesis of high surface-area colloidal assemblies of calixarene-phosphine-capped nanoporous gold is reported under reductive electrochemical conditions. These materials uniquely exhibit a remarkably thin wall thickness down to 10 nm, while possessing pore sizes on the order of up to hundreds of nanometers, which can be controlled via choice of organic… (More)
The low-energy isomers of Irx(CO)y(NHC)z (x = 1, 2, 4) are investigated with density functional theory (DFT) and correlated molecular orbital theory at the coupled cluster CCSD(T) level. The structures, relative energies, ligand dissociation energies, and natural charges are calculated. The energies of tetrairidium cluster are predicted at the CAM-B3LYP… (More)
Dielectric and acid-base bifunctional effects are elucidated in heterogeneous aminocatalysis using a synthetic strategy based on bulk silica imprinting. Acid-base cooperativity between silanols and amines yields a bifunctional catalyst for the Henry reaction that forms alpha,beta-unsaturated product via quasi-equilibrated iminium intermediate. Solid-state… (More)
Results of research specially created of a breadboard model and model of an electromagnetic drive with digital control executed with use hardware and software LabVIEW are submitted.
Justin M. Notestein, Jarred Ghirladucci, John D. Bass, Leandro R. Andrini,2, Andrew Solovyov, Felix G. Requejo, Enrique Iglesia, and Alexander Katz* Department of Chemical Engineering, University of California at Berkeley, Berkeley, California 94720 (USA) Departamento de Fisica, Facultad de Ciencias Exactas, Universidad Nacional de La Plata and IFLP-INFTA… (More)