(DI-DCNQI)(2)Ag where DI-DCNQI is 2,5-diiodo-N,N' -dicyanoquinonediimine has been investigated by electrical resistance, magnetic susceptibility, and H-1 NMR measurements, and found to be nonmetallic with a charge gap of similar to 490 K and with spin susceptibility showing localization of the pi-electron spins. Antiferromagnetic ordering is evidenced at a low temperature. This is a first case of the electron antiferromagnet among the DCNQI-metal family in which the pi electrons on the DCNQI columns have an antiferromagnetic state. The nature of a Mott insulator demonstrates the importance of electronic correlation in the rr electrons in the DCNQI systems.
(DI-DCNQI)(2)Ag,其中 DI-DCNQI 为 2,5-二碘-二氰基 quirky 环二腙双离子,通过电导率、磁 Susceptibility 和 H-1 NMR 的测量发现,该物质为非金属,具有类似于 490 K 的能隙以及自旋易化显示 π-电子自旋呈现局部化。在低温下,抗铁磁性有序被证实。这是 DCNQI-金属家族中首个..
。这种 Mott 非金属态突显了 DCNQI 系统中的 rr 电子间的电子型相关性的重要性。