A systematic study of the influence of ligand field on the slow magnetic dynamics of Co(<scp>ii</scp>)-diimine compounds
作者:Indrani Bhowmick、Brian S. Newell、Matthew P. Shores
DOI:10.1039/d0dt01597k
日期:——
[Co(H2bip)2Br2] (2), [Co(H2bip)3]Br2·1MeOH (3) and [Co(H2bip)2(Me2bpy)]Br2·(MeCN)0.5·(H2O)0.25 (4) (H2bip = 2,2′-bi-1,4,5,6-tetrahydropyrimidine, bpy = 2,2′-dipyridyl, Me2bpy = 4,4′-Me-2,2′-dipyridyl), purposefully prepared to enable a systematic study of magnetic property changes arising from the increase of overall ligand field from σ/π-donor chlorido (1) to π-acceptor 4,4′Me-2,2′bpy (4). The presence
在此我们报道了杂配 Co( II ) 二亚胺配合物 [Co(H 2 bip) 2 Cl 2 ] ( 1 ), [Co(H 2 bip) 2 Br 2 ] ( 2 ), [Co(H 2 bip) 3 ]Br 2 ·1MeOH ( 3 ) 和 [Co(H 2 bip) 2 (Me 2 bpy)]Br 2 ·(MeCN) 0.5 ·(H 2 O) 0.25 ( 4 ) (H 2 bip = 2,2'-bi- 1,4,5,6-四氢嘧啶,bpy = 2,2'-二吡啶基,Me 2bpy = 4,4'-Me-2,2'-dipyridyl),有目的地准备,以便系统地研究由 σ/π-供体氯化物 ( 1 ) 到 π-受体的整体配体场增加引起的磁性变化4,4'Me-2,2'bpy ( 4 )。这些化合物的轴向和菱形各向异性(D和E)的存在足以使1-4显示场诱导的磁化缓慢弛豫。有趣的是,我们发现随着有效配体场在系列中的增加,菱形(E