Presents an internally consistent set of 63 substituent constants developed for use with the Schoolery Relationship to predict the chemical shifts of methylene protons of acyclic compounds. Chemical shift data used in deriving the constants were taken mainly from primary sources of HNMR (nuclear magnetic resonance) spectra. (JN)

Twelve first- and second-grade children who consistently misarticulated consonant "r" and five children who correctly articulated "r" were recorded while repeating sentences differing only in a single "r'-"w" consonant. Among results: children whose "r" phones were "w"-like were most likely to misperceive their productions of "r." (Author)

Discusses factors that determine whether or not a sunburn is possible under glass, including the spectral dependence of the skin's sensitivity to sunburn, the ground-level spectrum of solar radiation, and the wavelength dependence of the transmission for the particular piece of glass. Concludes that it is possible to get sunburned through glass.…

An experimental study of ceramic superconductors namely YBa2Cu3O(sub 7-x), which illustrates the use of spectrophotometry, based on the electronic spectra of complexes of Fe(II), Fe(III) and Cu(II) to better understand the stoichiometry of YBCO is described. The results from this experiment are in good agreement with those obtained by the…

The presence of caffeine in coffee is determined by the use of separation devices and UV-vis spectrophotometry. The results indicate that the use of various analytical tools helps to perceive the higher concentration values obtained through UV-vis spectrophotometry than with separation methods.

The spectrophotometric method assists in the study of potassium permanganate-oxalate reaction. Basic analytical techniques and rules are implemented in the experiment, which can also include the examination of other compounds oxidized by permanganate.

A quantitative and qualitative study of the interplay between absorption, fluorescence, and excitation spectra of pollutants called polycyclic aromatic hydrocarbons (PAHs) is conducted. The study of five PAH displays the correlation of the above-mentioned properties along with the associated molecular changes.

The protein species of apomyoglobin (apoMb) and heme are freed and segregated from the aqueous protein solution of metmyoglobin by liquid chromatography, and are distinguished by UV-Vis absorption or electrospray ionization mass spectrometry (ESI-MS). This is an ingenious and effective approach to characterize apomyoglobin and heme, while students…

The microscale preparation, characterization, and reactivity of a square planar Co(III) complex that has grown out of a program to introduce experiments of relevance to green chemistry into the undergraduate curriculum is presented. The given experiments illustrate the remarkable redox and aqueous acid-base stability that make the macrocycles very…

The construction of a simple and inexpensive water-jacketed cuvette for the Spectronic 20 is described. This cuvette is utilized to determine the activation energy of the reaction between crystal violet and hydroxide ion spectrophotomerically.

The electronic properties of Cu(II) complex with proline are considered to demonstrate the Cotton effect in the visible region. A series of experiments in optical rotatory dispersion spectroscopy with free D- and L-proline and their complexes with the Cu(II) ion in aqueous solution is suggested.

We introduce a computer exercise that bridges spectroscopy and thermodynamics using statistical mechanics and the experimental data taken from the commonly used laboratory exercise involving the rotational-vibrational spectrum of HCl. Based on the results from the analysis of their HCl spectrum, students calculate bulk thermodynamic properties…

This article describes a discovery experiment for general chemistry and organic chemistry labs. Although the pinacol rearrangement has been employed in undergraduate organic laboratories before, in this application organic chemistry students act as mentors to students of general chemistry. Students work together using distillation--a new technique…

A project which exposes students to biologically important transition-metal chemistry is illustrated by taking an example of the iron-carbonyl compound, [mu]-(1,3-Propanedithiolaro)-hexa-carbonyldiiron as a structural model for an iron-only hydro-genase. The project provides the students with experience of Schlenk line techniques, purification,…

The stereochemical features of molecules can have far reaching effects in many areas of science including medicinal chemistry, materials chemistry, and supramolecular chemistry. There have been many techniques developed over the years to determine the absolute configuration of alkenes: the R,S configuration of chiral centers and the most stable…