O–P–O pathway are extremely weak in 1, and the overall magnetic behaviors are dominated by the Mn2(salen)2 moieties. Single-molecule magnetic behavior is observed in 1. For compound 2, the AF interaction over the O–P–O bridge is much stronger. The coexistence of metamagnetism and single-chain magnetic behavior is observed for 2.
本文报道了O–P–O桥接的Mn 2(salen)2(salen = N,N'-双(
水杨亚基)
乙二胺)链化合物的第一个例子,即[Mn 2(salen)2(2-FC 6 H 4 PO 3 H)](ClO 4)·1 / 2CH 3 OH(1)和[Mn 2(salen)2(4-FC 6 H 4 PO 3 H)](ClO 4)(2)。
膦酸酯
配体在1中采用顺-反双齿桥接方式和一个顺-顺二齿在桥接模式2,源自异构
膦酸酯
配体。不同的桥接方式会导致Mn–O···O-Mn扭转角在O–P–O桥上发生显着变化,其中1和2分别为96.6和1.9° 。结果,通过O–P–O途径介导的反
铁磁(AF)交换耦合极弱1,并且总体磁行为受Mn 2(salen)2部分支配。在1中观察到单分子磁行为。对于化合物2,通过O–P–O桥进行的AF交互作用更强。的metamagnetism和单链磁性行为的共存是观察2。