Larry Kolopajlo

Ternary complex formation kinetics. 2. Reaction of (triethylenetetramine)nickel(II) with ethylenediamine, bipyridine and sarcosine

Cinetique des reactions. Toutes les reactions sont du 1er ordre par rapport a Ni(trien) 2+ et reversibles

The metal exchange reaction between NiMIDA and copper(II)

The metal exchange reaction between copper(II) and N-methyliminodiacetatonickelate(II) (NiMIDA) was studied at 25.0°C and ionic strength of 1.25 within the pH range 3.5 to 4.8. The copper(II) to NiMIDA concentration ratio was varied over a two-hundred-fold range. The reaction is first-order in NiMIDA, copper(II) and hydrogen ion. The rate constant for the addition of copper(II) to NiMIDA is  = 5.10 × 10−3 M−1 s−1. The rate constants for both the hydrogen ion dependent- and independent- dissociations of NiMIDA are, respectively,  = 0.400 M−1 s−1 and k NiMIDA = 7.76 × 10−5 s−1. A mechanisim is presented which shows that MIDA does not prevent formation of a dinuclear intermediate and that MIDA partly unwraps from nickel before reacting with copper(II).

Green chemistry education in the Middle East

Abstract The Middle East once dominated the age of alchemy, and today it is experiencing a resurgence by transforming the age of petroleum chemicals into a greener science through Estidama. This green conversion is taking place through green chemical research and education. This report examines and reviews the understudied subject of green chemical education in the Middle East through the lens of context and history.

Kinetics of the ligand exchange of bipyridine in tetradentate nickel complexes

An investigation into the ligand exchange reaction of bipyridine with Ni(EDDA) and Ni(trien) has led to proposed mechanisms based on steric and electronic effects. Kinetic studies show that the rate order dependence of bipyridine is different for the two reactions implying a slightly different mechanism for the bulkier trien. Both mechanisms involve unwrapping of the tetradentate ligand as the rate-determining step. This unwrapping is faster in acidic solution, because protonation of the amine groups inhibits recoordination of the ligand to the nickel. The rates for bipyridine exchange were significantly faster than for phenanthroline, suggesting an electronic ligand effect.

Green Chemistry Pedagogy

Abstract This chapter attempts to show how the practice of chemistry teaching and learning is enriched by the incorporation of green chemistry (GC) into lectures and labs. To support this viewpoint, evidence from a wide range of published papers serve as a cogent argument that GC attracts and engages both science and nonscience students, enhances chemistry content knowledge, and improves the image of the field, while preparing the world for a sustainable future. Published pedagogy associated with green and sustainable chemistry is critically reviewed and discussed.