Maverick, Andrew - Louisiana State University

个人简介

Bachelor's Degree(s): Carleton College, 1975 PhD: California Institute of Technology, 1982

研究领域

We are studying two different groups of transition-metal complexes: polynuclear “host” molecules with well defined cavities, and volatile metal-organic compounds that can be used to prepare electronic materials. Metal-Organic Supramolecules Here we use organic bridging ligands to join two or more metal atoms into hollow “hosts” into which “guest” molecules can fit. Our goal is to use the hosts as catalysts for reactions of the guests (similar to the way metalloenzymes work), or as sensors for small guest molecules. This work began with our studies of host-guest reactions of bis(β-diketone) complexes such as Cu2(NBA)2, as shown in the sketch below: We are now using other β-diketones that can produce larger rings, 3-dimensional molecules, and crystalline porous framework solids. For example, the bis(β-diketone) m-pbprH2 yields a “molecular square” on reaction with Cu2+. This material is just the right size (diameter ~1.4 nm) to fit buckminsterfullerene (C60). See diagram below. Another ligand we have studied is “pyacH”, which has a β-diketone attached to pyridine so that the two groups can bind to two different metals. This ligand reacts with Cu2+ and Cd2+ to make a porous metal-organic framework, with still larger pores: To develop new catalysts based on these supramolecules, we are now preparing “cages” that contain catalytically active metals such as Rh. The sketch below illustrates one approach, with “arms” (shown in blue) that are expected to provide selective access to the catalytic site for specific substrate molecules. Electronic Materials New approaches are needed for making copper and other highly conductive materials for use in the next generations of integrated circuits. Our approach is chemical vapor deposition (CVD), in which a volatile “precursor” passes over a hot silicon wafer and reacts to form a thin film of Cu metal. the desired material. For example, the copper(I) cluster amides [CuNR2]4 (e.g., R = SiMe3, i-Pr) can be used for Cu CVD, and they are also photosensitive.

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Zhang, Y.; Maverick, A. W. Preparation of an isocyano-β-diketone via its Al, Zn, and Cu complexes, by use of metal ions as protecting groups. Inorg. Chem. 2009, 48, 10512-10518. Pariya, C.; Marcos, Y. S.; Zhang, Y.; Fronczek, F. R.; Maverick, A. W. Organosilicon‑based multifunctional β‑diketones and their rhodium and iridium complexes. Organometallics, 2008, 27, 4318-4324. Zhang, Y.; Chen, B.; Fronczek, F. R.; Maverick, A. W. A nanoporous Ag‑Fe mixed‑metal‑organic framework exhibiting single‑crystal‑to‑single‑crystal transformations upon guest exchange. Inorg. Chem. 2008, 47, 4433‑4435. Pariya, C.; Sparrow, C. R.; Back, C.-K.; Sandí, G.; Fronczek, F. R.; Maverick, A. W.. Copper β-diketonate molecular squares and their host-guest reactions. Angew. Chem. Int. Ed., 2007, 47, 6305-6308 Kakoullis, J.; Maverick, A. W.; Fronczek, F. R.. A molecular corner: fac-tricarbonylchlorido-bis[3-(4-pyridyl)pentane-2,4-dione-κN]rhenium(I) chloroform solvate. Acta Crystallogr. Sect. E: Struct. Rep. Online, 2007, 63, m1360-m1361 Burton, S.; Fronczek, F. R.; Maverick, A. W.. A cofacial binuclear copper(II) complex with a bridging 1,4-dithiane ligand. Acta Crystallogr. Sect. E: Struct. Rep. Online, 2007, 63, m1977-m1978 Maverick, A. W.; Laxman, R. K.; Hawkins, M. A.; Martone, D. P.; Fronczek, F. R.. Flexible cofacial binuclear metal complexes derived from α,α′-bis(salicylimino)-m-xylene. Dalton Trans., 2005, 200-206 Chen, B.; Fronczek, F. R.; Maverick, A. W.. Porous Cu-Cd mixed-metal-organic frameworks constructed from Cu(Pyac)2 (bis[3-(4-pyridyl)pentane-2,4-dionato]copper(II)). Inorg. Chem., 2004, 43, 8209-8211 Chen, B.; Fronczek, F. R.; Maverick, A. W.. Solvent-dependent 44 square grid and 64.82 NbO frameworks formed by Cu(Pyac)2 (bis[3-(4-pyridyl)pentane-2,4-dionato]copper(II)). Chem. Commun., 2003, 2166-2167 Maverick, A. W.; Fronczek, F. R.; Maverick, E. F.; Billodeaux, D. R.; Cygan, Z. T.; Isovitsch, R. A.. Structures of anhydrous and hydrated copper(II) hexafluoroacetylacetonate. Inorg. Chem., 2002, 41, 6488-6492 Maverick, A. W.; Billodeaux, D. R.; Ivie, M. L.; Fronczek, F. R.; Maverick, E. F.. Endo and exo coordination to cofacial binuclear copper(II) complexes. J. Inclusion Phenom. Macrocyclic Chem., 2001, 39, 19-26 Maverick, A. W.; James, A. M.; Fan, H.; Isovitsch, R. A.; Stewart, M. P.; Azene, E.; Cygan, Z. T.. New Routes Toward Chemical and Photochemical Vapor Deposition of Copper Metal. ACS Symp. Ser., 1999, 727, 100-112