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|Title:||Redox active metal-sulfide clusters and computer-assisted instructional lessons on transition metal chemistry|
|Author(s):||Gammon, Steven Drew|
|Doctoral Committee Chair(s):||Smith, Stanley|
|Department / Program:||Chemistry|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
Education, Teacher Training
Education, Technology of
|Abstract:||The chemical education research was focused on the design and implementation of a series of interactive videodisc chemistry lessons. These lessons were designed to give first year chemistry students an appreciation of some of the structural and electronic issues of coordination chemistry. This software uses IBM personal computers, Pioneer and Sony videodisc players, both touch and non-touch screens, and a local area network. The programming was done in Microsoft QuickBASIC. The videodisc was used in these lessons as a means for the students to observe real reactions of some transition metal complexes. The videodisc was also used to present a unique teaching approach to complementary colors and d orbital splitting of octahedral complexes.
The synthetic inorganic chemistry research involved the synthesis and characterization of a series of charge transfer salts using metal sulfide clusters and TCNQ. The goal of the research was to design a group of salts to be the organometallic analogs of (TTF)(TCNQ) and demonstrate metallic conductivity.
The metal sulfide clusters were cubanes of the formula (RCp)$\sb4$M$\sb2$M$\sp\prime\sb2$S$\sb4$ (R = H, Cp; M = Cr, V; M$\sp\prime$ = Cr,V) and the cluster (RCp)$\sb5$V$\sb5$S$\sb6$ (R = H, Cp). All of the above clusters were examined by cyclic voltammetry and were found to have a 0/+1 oxidation wave at about 0 mV (Ag/AgCl). This oxidation made them suitable for reaction with TCNQ. Upon reaction with TCNQ, we found that these clusters formed both 1:1 (cluster:TCNQ) and 1:2 charge transfer salts with TCNQ. These compounds were semiconductors with band gaps in the range of 0.24-0.75 eV. IR and structural studies of both the 1:1 and 1:2 indicated that the TCNQ had undergone a Peierls distortion and was dimerized.
|Rights Information:||Copyright 1989 Gammon, Steven Drew|
|Date Available in IDEALS:||2011-05-07|
|Identifier in Online Catalog:||AAI8924817|