The molecular conformation and packing mode of organic radicals are vital to achieving distinctive electronic, spin relaxation, and magnetic properties. Herein two organic radicals, B2P and B4P, are developed by attaching a 6-oxoverdazyl radical at different peripheral positions of [1]benzothieno[3,2-b][1]benzothiophene (BTBT). B2P single crystals exhibit a typical herringbone packing mode, whereas B4P single crystals display a classic brick-layer stacking structure. Moreover, two crystalline phases, B4P-Y and B4P-R, are observed in B4P crystals owing to the rotational isomerization. Because of the distinct molecular conformation and packing structures, the spin relaxation behaviors of the two 6-oxoverdazyl radicals are significantly different, and B4P-Y with a distorted conformation exhibits a longer spin relaxation time.

中文翻译：

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构型相关的6-氧过二氮杂基自由基单晶的自旋弛豫行为

有机自由基的分子构象和堆积模式对于实现独特的电子，自旋弛豫和磁性能至关重要。在此，通过在[1]苯并噻吩并[3,2- b ]的不同周边位置连接一个6-氧过二氮杂基，可以开发出两个有机基团B2P和B4P] [1]苯并噻吩（BTBT）。B2P单晶表现出典型的人字形堆积模式，而B4P单晶表现出经典的砖层堆叠结构。此外，由于旋转异构化，在B4P晶体中观察到两个结晶相B4P-Y和B4P-R。由于截然不同的分子构象和堆积结构，两个6-氧杂过二唑基团的自旋弛豫行为显着不同，并且具有扭曲构象的B4P-Y表现出更长的自旋弛豫时间。