Sheryl Mebane - Academia.edu (original) (raw)
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Institute for the History of Material Culture, Russian Academy of Sciences
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ChemQuery/Living by Chemistry (LBC) is a chemistry curriculum and assessment project that has fra... more ChemQuery/Living by Chemistry (LBC) is a chemistry curriculum and assessment project that has framed the "big ideas" of chemistry in order to provide developmental cohesion and promote conceptual understanding for students. This framework, called Perspectives of Chemists, informs on patterns and characteristics of the "conceptual change space" in the domain. The framework is based on integrating conceptual change theory with National and California State Science Standards, expert opinion, teacher interviews and classroom observations. The Perspectives framework has now been used to analyze progressions of student understanding at the high school and university level. This presentation will present data and analysis from this study, and show how articulation across the scale allows tracking of conceptual change pathways over time.
Journal of the American Chemical Society, 2001
The photosubstitution reactions of Fe(CO) 5 with alcohols and triethylphosphine have been studied... more The photosubstitution reactions of Fe(CO) 5 with alcohols and triethylphosphine have been studied in room temperature solution using femtosecond UV pump IR probe techniques. The dynamics of Fe(CO) 5 in alcohols show that the coordination of the hydroxyl group of the solvent with triplet Fe(CO) 4 is generally much faster than the coordination timescale observed with comparable singlet species. The physical reason for this is the fact that the metal C-H agostic bond is much weaker for triplets, thus allowing fast rearrangement to the hydroxyl group of the alcohol. In the case of triethylphosphine photosubstitution, the reaction is divided into parallel channels which include intersystem crossing and a spin conserving double carbonyl loss. The intermediates observed were studied using density functional theory (DFT) as well as ab initio quantum chemical calculations.
ChemQuery/Living by Chemistry (LBC) is a chemistry curriculum and assessment project that has fra... more ChemQuery/Living by Chemistry (LBC) is a chemistry curriculum and assessment project that has framed the "big ideas" of chemistry in order to provide developmental cohesion and promote conceptual understanding for students. This framework, called Perspectives of Chemists, informs on patterns and characteristics of the "conceptual change space" in the domain. The framework is based on integrating conceptual change theory with National and California State Science Standards, expert opinion, teacher interviews and classroom observations. The Perspectives framework has now been used to analyze progressions of student understanding at the high school and university level. This presentation will present data and analysis from this study, and show how articulation across the scale allows tracking of conceptual change pathways over time.
Journal of the American Chemical Society, 2001
The photosubstitution reactions of Fe(CO) 5 with alcohols and triethylphosphine have been studied... more The photosubstitution reactions of Fe(CO) 5 with alcohols and triethylphosphine have been studied in room temperature solution using femtosecond UV pump IR probe techniques. The dynamics of Fe(CO) 5 in alcohols show that the coordination of the hydroxyl group of the solvent with triplet Fe(CO) 4 is generally much faster than the coordination timescale observed with comparable singlet species. The physical reason for this is the fact that the metal C-H agostic bond is much weaker for triplets, thus allowing fast rearrangement to the hydroxyl group of the alcohol. In the case of triethylphosphine photosubstitution, the reaction is divided into parallel channels which include intersystem crossing and a spin conserving double carbonyl loss. The intermediates observed were studied using density functional theory (DFT) as well as ab initio quantum chemical calculations.