@article{sloop_shultz_coote_shepler_sullivan_kampf_boyle_2011, title={Synthesis of and structure-property relationships in zinc complexes of bis-metaphenylene semiquinone biradical species}, volume={25}, ISSN={0894-3230}, url={http://dx.doi.org/10.1002/poc.1917}, DOI={10.1002/poc.1917}, abstractNote={The design of novel, functionalized bis‐metaphenylene semiquinone (SQ) ligands and their corresponding metal complexes which combine conformational flexibility and electron‐withdrawing, electron‐donating, and conjugating substituents enable investigation of multiple structure–property relationships. Along these lines, we report the synthesis of three new bis(ZnII(SQ)TpCum,Me) complexes containing the bis‐metaphenylene coupling fragment. Using electron paramagnetic resonance spectroscopy, ab initio computations and superconducting quantum interference device magnetometry, we show how spin‐density is affected by the bis‐metaphenylene system substituents. Copyright © 2011 John Wiley & Sons, Ltd.}, number={4}, journal={Journal of Physical Organic Chemistry}, publisher={Wiley}, author={Sloop, Joseph C. and Shultz, David A. and Coote, Tashni and Shepler, Benjamin and Sullivan, Ubie and Kampf, Jeff W. and Boyle, Paul D.}, year={2011}, month={Aug}, pages={314–321} }
 @article{shultz_sloop_coote_beikmohammadi_kampf_boyle_2007, title={Substituent Effects on Exchange Coupling:  5-Aryl-Substituted Semiquinones and Their Complexes with MnIIand CuII}, volume={46}, ISSN={0020-1669 1520-510X}, url={http://dx.doi.org/10.1021/ic061807g}, DOI={10.1021/ic061807g}, abstractNote={A series of functionalized radical anion semiquinone (SQ-Ar) ligands and their MnII- and CuIIhydro-tris(3-cumenyl-5-methylpyrazolyl)borate (TpCum,MeMII) complexes were prepared and characterized. The semiquinone ligands have substituted phenyl rings (Ar = -C6H5NO2, -C6H5OMe, -C6H5-tert-Bu, etc.) attached to the SQ 5-position. Despite the "remoteness" of the phenyl ring substituents, the MII-SQ exchange parameters, J, were found to vary nearly 3-fold. Attempts to quantify the substituent effects on J are complicated by the fact that not all complexes could be structurally characterized. As such, substituent effects and phenyl-ring torsion angles could conspire to produce the observed variation in J values. Although there is no clear trend in the J values as a function of SQ substituent for the MnII complexes, for the CuII complexes, electron-withdrawing substituents on the phenyl ring have greater ferromagnetic J values than the CuII complexes of SQ ligands with electron-donating substituents. This trend suggests a FM contribution from MLCT excited states in the copper complexes.}, number={1}, journal={Inorganic Chemistry}, publisher={American Chemical Society (ACS)}, author={Shultz, David A. and Sloop, Joseph C. and Coote, Tashni-Ann and Beikmohammadi, Mithra and Kampf, Jeff and Boyle, Paul D.}, year={2007}, month={Jan}, pages={273–277} }