Two planarized analogues of the prototypical Blatter radical (1), peri-annulated 1Sand 1O, are demonstrated and provide a new platform for molecular and supramolecular engineering, and for tuning electronic and magnetic properties of the radical. Planarization of 1 results in bathochromic shift to the near-IR region, greater spin delocalization, and anodic shift of the reduction potential only for 1S. Magnetization studies revealed nearly ideal paramagnetic behavior at high temperatures for both radicals 1Sand 1Owith one-dimensional ferromagnetic interaction in the former (2J=14.4 cm−1) and antiferromagnetic interactions in 1Oat low temperatures.
Bibliographical noteFunding Information:
Support for this project was provided by the National Science Foundation (CHE-1214104) and National Science Center (2014/13/B/ST5/04525). Crystallographic data were collected by Dr. J. Krause through the SCrALS (Service Crystallography at the Advanced Light Source) program at the Advanced Light Source, Lawrence Berkeley National Laboratory under contract No. DE-AC02-05CH11231. C.P.C. thanks Prof. David A. Shultz for his hospitality and the use of his laboratory.
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- magnetic properties
- solid-state structure
- structure elucidation
- supramolecular chemistry