A decision-theoretic utility model that describes the consequences of employee movements out of and into the organization (separations and acquisitions) is presented. The model is developed for three types of employee movement: (a) repeated acquisitions without separations, (b) repeated unreplaced separations over time, and (c) repeated separations over time that are replaced with new employees. The latter model is the most general case, and provides an explicit link between separation utility and existing selection utility models. In addition to a conceptual and algebraic model development, a computer algorithm is developed and used to provide a numerical simulation. The results strongly suggest that decisions about employee separations can substantially affect the utility of human resources. Literature-based implications for future selection and turnover research are presented.Models for determining the usefulness of programs to improve human resource productivity have received increasing attention recently. The classic equations for expressing selection program utility in dollars (Brogden, 1946(Brogden, , 1949Cronbach & Gleser, 1965) have been applied to selecting computer programmers (Schmidt, Hunter, McKenzie, & Muldrow, 1979), selecting salespersons through assessment centers (Cascio & Silbey, 1979), and selecting steelworkers using a strength test (Arnold, Rauschenberger, Soubel, & Guion, 1983). With modifications, these formulas have also been applied to express the utility of nonselection "treatments" intended to improve existing employee performance such as feedback (Landy, Farr, & Jacobs, 1982

A series of Lewis base adducts of 9-bromo-9-borafluorene (BrBFl-LB, LB = IPr, IPrCH2, PPh3, and PCy3), parent borafluorenes (HBFl-IPr and HBFl-IPrCH2), and the bisadduct [(DMAP)2BFl]Br were prepared and structurally characterized (IPr = [(HCNDipp)2C:], IPrCH2 = [(HCNDipp)2C═CH2], Dipp = 2,6-i-Pr2C6H3, and DMAP = N,N-dimethylaminopyridine). The adducts BrBFl-IPr, BrBFl-PPh3, BrBFl-PCy3, [(DMAP)2BFl]Br, BrBFl-IPrCH2, and HBFl-IPrCH2 were found to exhibit bright blue luminescence with low to moderately high quantum efficiencies (19 to 63%). Selective irradiation at different excitation wavelengths revealed the presence of two distinct emission processes in the adducts BrBFl-LB, leading to a ligand-independent, presumably borafluorene-based, blue light emission at 435 nm and another less intense emission band in the ultraviolet region (315-324 nm); [(DMAP)2BFl]Br exhibits an emission profile that tails into the visible region. Time-dependent density functional theory studies are also included for representative borafluorene adducts. With a judicious choice of functional groups at boron, one can envisage the future generation of a whole library of 4-coordinate borafluorene-based luminogens that complement the efficient light-emitting behavior known for the widely studied boron-dipyrromethene analogues.

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IR and vibrational circular dichroism (VCD) spectra of a chiral amine-borane in solution are investigated. By comparison of experimental and calculated spectra, unique VCD spectral signatures, which can be attributed to the formation of dihydrogen-bonded dimers in solution, are identified for the first time. These VCD features are highly sensitive to the specific dihydrogen-bonding topologies utilized by the chiral amine-borane subunits and thus provide direct structural information of these dihydrogen-bonded species in solution. Differences in the dihydrogen binding arrangements in solution and in solid state are also revealed.

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