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首页> 外文期刊>Chemistry: A European journal >A Cobalt Pyrenylnitronylnitroxide Single-Chain Magnet with High Coercivity and Record Blocking Temperature
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A Cobalt Pyrenylnitronylnitroxide Single-Chain Magnet with High Coercivity and Record Blocking Temperature

机译：具有高矫顽力和记录阻断温度的P苯基亚硝基硝基钴钴单链磁体

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摘要

Coordination of a [Co(hfac)_2] moiety (hfac=hexa-fluoroacetylacetonate) with a nitronylnitroxide radical linked to bulky, rigid pyrene (PyrNN) gives a helical 1:1 chain complex, in which both oxygen atoms of the radical NO_· groups are bonded to Co~(II) ions with strong antiferro magnetic exchange. The complex shows single-chain magnet (SCM) behavior with frequency-dependent magnetic susceptibility, field-cooled and zero-field-cooled susceptibility divergence with a high blocking temperature of around 14 K (a record among SCMs), and hysteresis with a very large coercivity of 32 kOe at 8 K. The magnetic behavior is partly related to good chain isolation induced by the large pyrene units. Two magnetic relaxation processes have been observed, a slower one attributable to longer, and a faster one attributable to short chains. No evidence of magnetic ordering has been found.
机译：[Co（hfac）_2]部分（hfac =六氟乙酰丙酮）与与庞大的刚性rigid（PyrNN）连接的硝酰基硝基氧自由基的配位产生螺旋1：1链络合物，其中自由基NO_·的两个氧原子基团通过强反铁磁交换键与Co〜（II）离子结合。该复合物显示出单链磁体（SCM）行为，具有随频率变化的磁化率，场冷和零场冷的磁化率散度，具有14 K左右的高阻塞温度（SCM之间的记录），并且磁滞非常小在8 K时32 kOe的大矫顽力。磁行为部分与大pyr单元引起的良好链隔离有关。已经观察到两个磁弛豫过程，一个较慢的归因于更长的时间，一个较快的归因于短链。尚未发现磁性排序的证据。

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