Lauri Vaska (May 7, 1925 – November 15, 2015) was an

Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Ru ...

n-American chemist who has made noteworthy contributions to

organometallic chemistry Organometallic chemistry is the study of organometallic compounds, chemical compounds containing at least one chemical bond between a carbon atom of an organic molecule and a metal, including alkali, alkaline earth, and transition metals, and so ...

. Vaska was born in

Rakvere Rakvere is the administrative center, or county seat, of Lääne-Viru County in northern Estonia, about 100 km southeast of Tallinn and 20 km south of the Gulf of Finland and the Baltic Sea. Rakvere boasts a distinctive architectural feature: th ...

, Estonia. He was educated at the

Baltic University The Baltic University in Exile was established in the displaced persons camps in Germany to educate refugees from Estonia, Latvia and Lithuania in the aftermath of the Second World War. The University was established at Hamburg in the British Zon ...

Hamburg Hamburg (, ; ), officially the Free and Hanseatic City of Hamburg,. is the List of cities in Germany by population, second-largest city in Germany after Berlin and List of cities in the European Union by population within city limits, 7th-lar ...

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

(1946) and subsequently at the

University of Göttingen The University of Göttingen, officially the Georg August University of Göttingen (, commonly referred to as Georgia Augusta), is a Public university, public research university in the city of Göttingen, Lower Saxony, Germany. Founded in 1734 ...

(1946–1949), where he received his ''Vordiplom'' (equivalent to the American B.S. degree). He emigrated to the United States in 1952 and pursued his Ph.D. in

inorganic chemistry Inorganic chemistry deals with chemical synthesis, synthesis and behavior of inorganic compound, inorganic and organometallic chemistry, organometallic compounds. This field covers chemical compounds that are not carbon-based, which are the subj ...

at the

University of Texas The University of Texas at Austin (UT Austin, UT, or Texas) is a public research university in Austin, Texas, United States. Founded in 1883, it is the flagship institution of the University of Texas System. With 53,082 students as of fall 2 ...

(1952–1956). He was a postdoctoral fellow at

Northwestern University Northwestern University (NU) is a Private university, private research university in Evanston, Illinois, United States. Established in 1851 to serve the historic Northwest Territory, it is the oldest University charter, chartered university in ...

(1956–1957) where he conducted research on magnetochemistry. In 1957 he took a position as Fellow at the Mellon Institute in

Pittsburgh Pittsburgh ( ) is a city in Allegheny County, Pennsylvania, United States, and its county seat. It is the List of municipalities in Pennsylvania#Municipalities, second-most populous city in Pennsylvania (after Philadelphia) and the List of Un ...

, where he remained until 1964. During that time, the Mellon Institute housed a number of future chemists, including

Paul Lauterbur Paul Christian Lauterbur (May 6, 1929 – March 27, 2007) was an American chemist who shared the Nobel Prize in Physiology or Medicine in 2003 with Peter Mansfield for his work which made the development of magnetic resonance imaging (MRI) possi ...

and R. Bruce King. Vaska moved as an associate professor to

Clarkson University Clarkson University is a private research university with its main campus in Potsdam, New York. Clarkson has additional graduate programs and research facilities in the New York Capital District. It was established in 1896 and enrolled over 4 ...

Potsdam Potsdam () is the capital and largest city of the Germany, German States of Germany, state of Brandenburg. It is part of the Berlin/Brandenburg Metropolitan Region. Potsdam sits on the Havel, River Havel, a tributary of the Elbe, downstream of B ...

New York New York most commonly refers to: * New York (state), a state in the northeastern United States * New York City, the most populous city in the United States, located in the state of New York New York may also refer to: Places United Kingdom * ...

, where, from 1990 to his death, he was professor emeritus of chemistry. His brother was a philosopher. He died in

Basking Ridge, New Jersey Basking Ridge is an Local government in New Jersey#Unincorporated communities, unincorporated community and census-designated place (CDP) located within Bernards Township, New Jersey, Bernards Township in the Somerset Hills region of Somerset ...

in 2015, aged 90.

Research

Vaska published ''ca.'' eighty journal articles on the

coordination chemistry A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of chemical bond, bound molecules or ions, that are in turn known as ' ...

transition metal In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded. The lanthanide and actinid ...

homogeneous catalysis In chemistry, homogeneous catalysis is catalysis where the catalyst is in same phase as reactants, principally by a soluble catalyst in a solution. In contrast, heterogeneous catalysis describes processes where the catalysts and substrate are in d ...

, and both organometallic and

bioinorganic chemistry Bioinorganic chemistry is a field that examines the role of metals in biology. Bioinorganic chemistry includes the study of both natural phenomena such as the behavior of metalloproteins as well as artificially introduced metals, including those t ...

. His years at Mellon were especially productive. With J.W. Di Luzio in 1962 he first described the

iridium Iridium is a chemical element; it has the symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group, is considered the second-densest naturally occurring metal (after osmium) with a density ...

compound which became known as Vaska's complex, ''trans''-IrCl(CO) (C₆H₅)₃sub>2 Working with a series of coworkers, he demonstrated that this iridium(I) complex undergoes a variety of reactions with small molecules. For example, it oxidatively adds H₂ to give a dihydride. He subsequently discovered that his complex reversibly bound O₂, which was then a startling achievement. He discovered the main reactions of

oxidative addition Oxidative addition and reductive elimination are two important and related classes of reactions in organometallic chemistry. Oxidative addition is a process that increases both the oxidation state and coordination number of a metal centre. Oxidat ...

, a process that is central to

in organometallic chemistry. He demonstrated a number of important substituent effects on the oxidative addition, such as the greater reactivity of Ir(I) ''vs.'' Rh(I) and the stabilization of

oxidative Redox ( , , reduction–oxidation or oxidation–reduction) is a type of chemical reaction in which the oxidation states of the reactants change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is ...

adduct In chemistry, an adduct (; alternatively, a contraction of "addition product") is a product of a direct addition of two or more distinct molecules, resulting in a single reaction product containing all atoms of all components. The resultant is ...

s by

iodide An iodide ion is I−. Compounds with iodine in formal oxidation state −1 are called iodides. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate. Worldwide, iodine deficiency ...

''vs.''

chloride The term chloride refers to a compound or molecule that contains either a chlorine anion (), which is a negatively charged chlorine atom, or a non-charged chlorine atom covalently bonded to the rest of the molecule by a single bond (). The pr ...

Recognition

Among his awards are the

Boris Pregel Award Boris may refer to: People * Boris (given name), a male given name * *List of people with given name Boris * Boris (surname) Arts and media * Boris (band), a Japanese experimental rock trio * ''Boris'' (EP), by Yezda Urfa, 1975 * "Boris" (son ...

for Research in Chemical Physics (

New York Academy of Sciences The New York Academy of Sciences (NYAS), originally founded as the Lyceum of Natural History in January 1817, is a nonprofit professional society based in New York City, with more than 20,000 members from 100 countries. It is the fourth-oldes ...

) in 1971 and election in 1981 as a Fellow of the

American Association for the Advancement of Science The American Association for the Advancement of Science (AAAS) is a United States–based international nonprofit with the stated mission of promoting cooperation among scientists, defending scientific freedom, encouraging scientific responsib ...

for "pioneering work in transition metal organometallic chemistry and synthetic oxygen carriers".

References

{{DEFAULTSORT:Vaska, Lauri 1925 births 2015 deaths Inorganic chemists 20th-century American chemists Estonian chemists University of Texas at Austin College of Natural Sciences alumni Northwestern University alumni Carnegie Mellon University faculty Clarkson University faculty Estonian emigrants to the United States People from Rakvere Estonian World War II refugees Recipients of the Order of the White Star, 3rd Class