Pimentel, George

GEORGE C. PIMENTEL Editor for the Chemical Education Material Study... 

GEORGE C. PIMENTEL, Editor, Textbook University of California... 

Two years ago, the National Research Council published a report on research frontiers and needs in chemistry entitled Opportunities in Chemistry, and known colloquially as the "Pimentel Report" after its chairman, George C. Pimentel. That report identified many of the same areas discussed in this report and focused on how chemists contribute to them. This committee endorses the recommendations contained in Opportunities in Chemistry, and urges their implementation in addition to the recommendations contained in this volume. The two reports, like the two disciplines, should be seen as complementary, not competing. A vital base of chemical science is needed to stimulate future progress in chemical engineering, just as a vital base in chemical engineering is needed to capitalize on advances in chemistry. 

The term matrix isolation was coined by George Pimentel who pioneered this field together with George Porter. Pimentel intended this term to refer to a method whereby a substrate is mixed with a large exess of an (unsually unreactive) host gas and is condensed on a surface that is sufficiently cold to assure rapid solidification of the material. In this way, one ends up with a sample where (ideally) each substrate molecule is immobilized in a cavity surrounded by one or more layers of inert material and is thus isolated from the other substrate molecules in a matrix of the host gas. 

George C. Pimentel and Richard D. Spratley, Chemical Bonding Clarified Through Quantum Mechanics, Holden-Day, San Francisco, 1969. 

FIGURE 3-3 IR spectrum of A -methylacetamide in various solvents in the N—H stretching region 0.4 M at 30 G. [Unpublished spectra of William A. Klemperer and George C. Pimentel]... 

Introductory Quantitative Chemistry Axel R. Olson Charles W. Koch and George C. Pimentel... 

Harry B. Gray, Bruce H. Mahan, and George C. Pimentel for the legacy of their textbooks and lectures... 

On a personal note, it gives us genuine pleasure to dedicate this sixth edition of our textbook to Professor Harry Gray and to the memory of Professors Bruce Mahan and George Pimentel. We have enjoyed and been inspired by their textbooks, lectures, research papers, and seminars since our student days in the 1970s. Our own education owes much to their pioneering explanations of the role of quantum mechanics in chemical bonding. 

Al received many awards from American and foreign societies, including the U.S. National Medal of Science (1982), Robert A. Welch Award (1994), and Israel s Wolf Prize (2000). His major ACS honors include the Award in Inorganic Chemistry (first recipient, 1962), Award for Distinguished Service in the Advancement of Inorganic Chemistry (1974), Award in Organometallic Chemistry (2001), F. Albert Cotton Medal for Excellence in Chemical Research (first recipient, 1995), George C. Pimentel Award in Chemical Education (2005), and... 

A different bonding model that would not need to invoke d-orbitals was aheady suggested by George Pimentel and Robert Rundle [17, 18]. It involved a 3-centre 4-electron bond, and the planarity of the SO units in the sulfur oxides allows the formation of a delocalized ir-electron system, leading to m-centre-n-electron bonding. Nowadays this simple model is challenged to provide more sophisticated explanations for hypervalent molecules (e.g., [19]). 

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