σ-Hole activation and structural changes upon perfluorination of aryl halides: direct evidence from gas phase rotational spectroscopy.

Enhancement of the σ-hole on the halogen atom of aryl halides due to perfluorination of the ring is demonstrated by use of the Extended Townes-Dailey (ETD) model coupled to a Natural Atomic Orbital Bond analysis on two perfluorinated aryl halides (CFCl and CFBr) and their hydrogenated counterparts. The ETD analysis, which quantifies the halogen p-orbitals populations, relies on the nuclear quadrupole coupling constants which in this work are accurately determined experimentally from the rotational spectra. The rotational spectra investigated by Fourier-transform microwave spectroscopy performed in supersonic expansion are reported for the parent species of CFCl and CFBr and their C, Cl or Br substituted isotopologues observed in natural abundance.

Resilience in Baccalaureate Nursing Students: An Exploration.

The purpose of the current study was to explore resilience in senior-level baccalaureate nursing students. Twenty-seven participants completed an online questionnaire assessing three stressors that pertained to marriage or divorce, death or loss of family members or close friends, and extreme financial hardship in the past 1 year. Resilience was measured using the 25-item Connor-Davidson Resilience Scale (CD-RISC-25) and one open-ended question about the experience of resilience.

Characterization of C-H...π interactions in the structure of the CHClF(2)-HCCH weakly bound complex.

The microwave spectra of four isotopologues of the CHClF(2)-HCCH dimer have been measured and used to determine the structure of the complex. An initial scan over the 7-18 GHz region using the chirped-pulse microwave spectrometer at the University of Virginia provided initial assignments of the (35)Cl and (37)Cl isotopologues, with two additional H(13)C(13)CH species assigned using the resonant cavity Balle-Flygare microwave spectrometer at Eastern Illinois University. For the most abundant isotopologue, the rotational constants and quadrupole coupling constants are: A = 3301.