Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, USA.
Chem Commun (Camb). 2011 Jun 14;47(22):6443-5. doi: 10.1039/c1cc11172h. Epub 2011 May 4.
1,3-Alternate calix[4]arene with para-phenylene spacers connecting nitroxide monoradicals and high-spin (S = 1) diradicals provides tetraradical and octaradical scaffolds that possess conformations with slow electron spin relaxation rates (1/T(1)). Such scaffolds may facilitate tuning of relaxation rates that are more favorable for MRI or DNP applications.
1,3-交替杯[4]芳烃具有连接氮氧自由基单自由基和高自旋（S=1）双自由基的对亚苯基间隔基，提供具有缓慢电子自旋弛豫率（1/T(1)）的四自由基和八自由基支架。这些支架可能有助于调整弛豫率，使其更有利于 MRI 或 DNP 应用。
