Isolation and Characterization of a Highly Reducing Aqueous Chromium(II) Complex.

The highly reducing Cr-(1,3-propylenediaminetetraacetate) (CrPDTA) complex (-1.1 V vs SHE) has been isolated from aqueous solution and the solid-state structure is described. The reduced CrPDTA complex is characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, UV-vis spectroscopy, magnetic moment, and density functional theory calculations.

Sterically encumbered β-diketonates and base metal catalysis.

Metal coordination complexes of the sterically hindered β-diketonate, 2,6-dimesitylbenzoyl pinacolone (esac), are reported for Co, Ni, Cu, and Zn. All four form ML2-type complexes with typical coordination behavior for late-metal β-diketonates, however the effects on established electrochemistry and reactivity vary somewhat per metal. For example, the striking chemical and electrochemical inertness of CoII(esac)2 to oxidation and disproportionation is atypical.

Bulky β-Diketones Enabling New Lewis Acidic Ligand Platforms.

The synthesis of a sterically encumbered β-diketone ligand (acac) substituted with 2,6-(2,4,6-MeCH)CH is described. Coordination complexes of the type M(acac)Cl(solv) (M = Ti, V, Cr; solv = THF, CHCN) were prepared by the reaction of acac with MCl (M = V, Cr) or with TiCl to generate Ti(acac)Cl, followed by reduction. These complexes show a trend of alternating the cis/trans geometric preference with increasing d electron count (n = 0, 1, 2, 3), which is rationalized in part by the unusual ability of β-diketonates to behave as either a weak π donor or a π acceptor in the cis and trans geometries, respectively.

Concussion assessment and management knowledge among chiropractic fourth year interns and residents.

Objectives: To investigate the degree of knowledge chiropractic fourth year interns and post-graduate chiropractic residents have in regard to concussion diagnosis and management.

Methods: A survey modified from a study conducted by Boggild and Tator (2012), was administered to fourth year chiropractic interns and post-graduate residents via SurveyMonkey.com.

Simplified procedure for encapsulating cytochrome c in silica aerogel nanoarchitectures while retaining gas-phase bioactivity.

Cytochrome c (cyt. c) has been encapsulated in silica sol-gels and processed to form bioaerogels with gas-phase activity for nitric oxide through a simplified synthetic procedure. Previous reports demonstrated a need to adsorb cyt.