Dynamic and static Jahn-Teller distortions in a CuN6 cage complex

✍ Scribed by Tapan Kumar Kundu; Periakaruppan T. Manoharan

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 544 KB
• Volume: 241
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00690-6

✦ Synopsis

EPR studies of pure and doped (in an isostructural diamagnetic zinc lattice) polycrystalline Cu(di(amH)sar) 4 over a wide range of temperature (7-280 K) show that both undergo a transition from dynamic to static Jahn-Teller distortions. The spectra were simulated to get the g-and A-tensors. The transition temperature for the pure polycrystalline sample is ~< 120 K and for the doped one it is above room temperature. There is evidence for the existence of cooperative and localized Jahn-Teller distortions respectively in pure and doped crystals. From the g-tensors of the pure polycrystaUine sample there is evidence, supported by single-crystal results, of rapid electronic exchange between two inequivalent Cu(II) sites.