ACS Turnpike Speaker Series
Prof. Lawrence F. Dahl
University of Wisconsin–Madison
SYMMETRY AND ITS IMPORTANCE
IN ART AND SCIENCE
WEDNESDAY!!!!!!
The Speaker:
B.S. 1951, University of Louisville
PhD. 1956, Iowa State University
Professor Lawrence F. Dahl has earned numerous awards and recognitions for his
contribution to the growth of organometallic cluster science and crystallography.
Among his many notable awards, he is a Recipient of Honorary Doctorate Degree,
University of Louisville, 1991, was elected to the National Academy of Sciences,
1988, was a recipient of a Senior U.S. Scientist Humboldt Award by the Alexander
von-Humboldt-Stiftung, was elected Fellow of the AAAS, 1980, American Chemical
Society Award in Inorganic Chemistry, 1974, Guggenheim Fellow, 1969-1970, Alfred
P. Sloan Foundation Fellow, 1963-65.
The research in his group continues to focus mainly on high-nuclearity homometallic
and heterometallic carbonyl clusters: namely, those with at least 10 metal-core
atoms containing primarily Group 10 (Ni, Pd, Pt) and Group 11 (Cu, Ag, Au) metals
that form direct metal-metal bonds.
Recent publications:
Tran, N.T.; Kawano, M.; Powell, D.R.; Dahl, L.F., "High-Nuclearity [Pd13Ni13(CO)34]4-
Containing a 26-atom Pd13Ni13 Core With an Unprecedented Five-Layer Close-Packed
Triangular Stacking Geometry: Possible Substitutional Pd/Ni Crystal-Disorder
at Specific Intralayer Nickel Sites", J. Chem. Soc., Dalton Trans., 2000,
4138-4144. Mlynek, P.D.; Kawano, M.; Kozee, M.A.; Dahl, L.F., "First-Known
High-Nuclearity Copper-Nickel Carbonyl Cluster: [CuxNi35-x(CO)40]5- (with x=3
or 5) Containing an Unprecedented 35-Atom Three-Layer hcp Triangular Stacking
Metal-Core Geometry', J. Cluster Science, 2001, 12, 321-346. Tran, N.T.; Powell,
D.R.; Dahl, L.F., "Nanosized Pd145(CO)x(PET3)30 Containing a Capped Three-Shell
145-Atom Metal-Core Geometry of Pseudo Icosahedral Symmetry", Angew. Chem.,
2000, 39, 4121-4125. (Editors’ Choice in Science, 2000, 290, 12/61). Kawano,
M.; Bacon, J.W.; Campana, C.F.; Winger, B.E.; Dudeck, J.D.; Sirchio, S.A.; Scruggs,
S.L.; Geiser, U.; Dahl, L.F., "High-Nuclearity Close-Packed Palladium-Nickel
Carbonyl Phosphine Clusters: Heteropalladium [Pd16Ni4(CO)22(PPh3)4]2- and [Pd33Ni9(CO)41(PPh3)6]4-
Containing Pseudo-Td ccp Pd16Ni4 and Pseudo-D3h hcp Pd33Ni9 Cores", Inorg.
Chem., 2001, 40, 2554. Tran, N. T.; Kawano, M., Dahl, L.F. “High-Nuclearity
Palladium carbonyl Trimethlphospine Clusters Containing Unprecedented Face-Condensed
Icosahedral-Based Transition-Metal Core-Geometries”, J. Chem. Soc., Dalton
Trans., 2001, XXXX. Zhang, J.; Dahl, L. F., “First-Known High-Nuclearity
Silver-Nickel Carbonyl Cluster: Nanosized [Ag16Ni24(CO)40]4- Possessing a New
40-Atom Cubic Td Closed-Packed Metal-Core Geometry”, Submitted for publication.
Kozee, M. A.; Dahl, L.F. “Cyclo-[Ni(µ2-SPh)2]11: A New Type of Toroidal
Nickel (II) Thiolate Containing a Co-Crystallized Solvated Guest Molecule”,
Submitted for publication. Kozee, M.A.; Dahl, L.F. “ Synthesis, Characterization,
and Reactivity of the [Au16Ni24(CO)40]4- Tetraanion: a Nanosized Bimetallic
Carbonyl Cluster Containing an Unpredicted Microscopic ccp Chunk of Quasi-Gold
Metal”, Submitted for publication.
The Talk:
An animated 10-minute "psychedelic" video on "Symmetry"
will be shown together with pictures to illustrate the principles of symmetry
both in art and science. The presentation will introduce and apply the basic
concepts of point group symmetry to describe a wide variety of intriguing molecular
architectures and crystal morphologies. It will also introduce and illustrate
the use of one- and two-dimensional space-group symmetries to analyze the symmetry
aspects of Hungarian folk needlework and M.C. Escher's periodic drawings. This
talk will not assume any prior knowledge or background on symmetry, and all
of the basic principles of symmetry will be developed from a conceptual viewpoint.
Recent results of our research on the preparation and physical/chemical characterization
of new nanosized transition metal carbonyl clusters will also be included to
emphasize the importance of symmetry in modern x-ray diffraction analyses of
crystalline materials to obtain and describe the ultimate structures.
Directions:
The restaurant is located at Howard Johnson Express Inn at 2389 Route 70 West,
Cherry Hill. From Interstate 295, take exit 34B (Cherry Hill/Route 70 West exit).
Proceed aprx 4 mi on Rte 70 West, hotel is on your left. Pass the Hotel sign
and at the next light make a U-turn. Please call the restaurant at 856-773-1200
for directions if lost.
Social Hour: 5:30-6:30 PM
Dinner: 6:30 PM
Talk: 7:30 PM
Dinner selections: Poultry, sea food, lamb, vegetarian, all you can eat buffet.
Cost: $15 members and guests, $10 students
Lori Stephans (856) 256-4500 ext. 3551 or ‘stephans@rowan.edu’
Thomas Colacot (856) 384-7185 or ‘colactj@jmusa.com’
Peter Mlynek (856) 787-0770 or ‘pdmlynek@yahoo.com’
Guenter Niessen (856) 423-6300 or ‘gniessen@emscience.com’