Kalamazoo Section of the American Chemical Society
We are a dynamic and visionary organization committed to improving people’s lives in our community through the transforming power of chemistry. We strive to advance the broader chemistry enterprise and its practitioners for the benefit of Kalamazoo, Allegan and Van Buren counties.
April 2014 Newsletter
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Highlights
- Comments from the KACS chair
- How to suggest a session topic for the 2015 regional meeting.
- About an upcoming special event on organic chemistry
Comments from the Chair
John H. Engelmann, Ph.D. (KACS Chair)
Miscellaneous
2015 Joint Great Lakes Central Regional Meeting – Call for Sessions
The co-program chairs are soliciting suggestions for technical session topics for the 2015 Joint Great Lakes Central Regional Meeting of the American Chemical Society to be held May 27 - May 30, 2015 in Grand Rapids. The overall theme of the meeting is “Chemistry - A Grand Enterprise” and will focus on three main areas: Food, Health, and the Environment.
Do you have an idea you want to share? Please let us know.
Councilor Report – 2014 Spring National Meeting
The KACS Councilor Report from the 2014 Spring ACS Meeting in Dallas, TX, March 16-20, 2014, may be viewed here.
Special Presentation
“Site-Selective C-H Oxidations”
Dr. M. Christina White
Department of Chemistry
University of Illinois at Urbana-Champagn
Download the event flyer here.
The White Group uses the C-H bond as a new functional group for streamlining organic synthesis
Thanks to our sponsors:
For more information, contact Dr. James Kiddle at james.kiddle@wmich.edu or (269) 387-5440.
Do you have questions, comments, or a desire to contribute to the newsletter? Send an e-mail to chair@kalamazooacs.org .
By John H. Engelmann
Spring is almost here. Plants will soon turn green due to chlorophyll. Chlorophyll has a highly conjugated cyclic structure with heterocyclic nitrogen- containing rings. Two of the nitrogen atoms are negative, and magnesium is the counterion. Chlorophyll absorbs red and blue light, and reflects green light and accordingly makes plants appear green.
St. Patrick's Day has just passed and of course the Chicago river was once again dyed green to mark the day. Since green is such a common color, artists have looked for green pigments suitable for painting. One of the earliest green pigments is malachite, which was used by the Egyptians in their artwork. Malachite is a copper carbonate hydroxide mineral, having the formula Cu2CO3(OH)2. In the first century the Romans used malachite as a green pigment. Another copper- containing pigment is verdigris. Verdigris is the green patina which forms on copper as it weathers. It may be formed by exposing copper to acetic acid and scraping the powder off the copper. This would form copper(II) acetate.
Alternatively, copper may simply be allowed to weather in which case the verdigris formed is copper carbonate. Verdigris is lightfast and stable in oil paint although it is not stable in other media. It was widely used because of its desirable blue-green color. Another green pigment used since Roman times is Verona green. It is a clay colored by a mixture of iron oxide and silicates of magnesium, aluminum and potassium such as potassium aluminum silicate. Cobalt green is another green pigment which does not contain copper. It is made by heating a mixture of cobalt(II) oxide and zinc oxide. Sven Rinman, a Swedish chemist, discovered this compound in 1780. Chrome green was patented in 1859. The pigment contains chromium oxide dihydrate. It is stable and not toxic. Copper phthalocyanine is a more modern green pigment. By adding substituents the color may be varied from green to blue.