Slow Magnetic Relaxation Triggered by a Structural Phase Transition in Long-Chain-Alkylated Cobalt(II) Single-Ion Magnets
作者:Fumiya Kobayashi、Ryo Ohtani、Masaaki Nakamura、Leonard F. Lindoy、Shinya Hayami
DOI:10.1021/acs.inorgchem.9b00543
日期:2019.6.3
reflects large distortions of their coordination environments caused by the packing of long alkyl chains for two Co(II) complexes of the type [Co(Cn-terpy)2](BF4)2 (Cn-terpy = 4′-alkoxy-2,2’:6′,2″-terpyridine; n = 10 (1), 16 (2)) is reported. 1·2MeOH, which features a highly distorted octahedral high-spin Co(II) center, exhibits field-induced slowmagneticrelaxation under an applied dc field of 1000
单离子磁体(SIM)的行为反映了由两个[Co(C n -terpy)2 ](BF 4)型Co(II)配合物的长烷基链堆积而引起的配位环境的大变形。报告了2(C n -terpy = 4'-烷氧基-2,2':6',2''-叔吡啶;n = 10(1),16(2))。1 ·2MeOH具有高度扭曲的八面体高自旋Co(II)中心,在施加的1000 Oe直流磁场下表现出场感应的慢磁弛豫。对弛豫过程的进一步详细分析表明,低温下拉曼过程盛行。令人惊讶的是2不仅显示了反向自旋跃迁(rST),而且还表现出了显着的场感应SIM行为,从而揭示了这种高自旋Co(II)物种的磁各向异性的存在,该各向异性是由结构相变触发的。我们在这里提供磁场诱导的慢磁弛豫和rST与结构相变相关的第一个示例,该结构相变涉及从长刀到反长链烷基构象的变化。这些结果表明在具有长烷基链的其他扭曲的高自旋Co(II)物种中诱导SIM特性的前景。
Visible-Light-Induced Morphological Changes of Giant Vesicles by Photoisomerization of a Ruthenium Aqua Complex
incorporating a ruthenium aqua complex having two alkyl chains on tridentate and asymmetrical bidentate ligands (proximal‐2: [Ru(C10tpy)(C10pyqu)OH2]2+, C10tpy=4′‐decyloxy‐2,2′;6′,2“‐terpyridine, C10pyqu=2‐[2′‐(6′‐decyloxy)‐pyridyl]quinoline). The ruthenium complex of proximal‐2 with closed alkyl chain geometry and a cylinder‐like molecular shape exhibited photoisomerization to distal‐2 with an open alkyl