Mondal Amit Kumar, Parmar Vijay Singh, Biswas Soumava, Konar Sanjit
Department of Chemistry, IISER Bhopal, Bhopal 462066, MP, India.
Dalton Trans. 2016 Mar 21;45(11):4548-57. doi: 10.1039/c5dt04173b. Epub 2016 Feb 4.
A rare class of dinuclear double-stranded helicates having tetrahedral metal centres with formulae [Co2(L(1))2]·2(CH3CN) (1), [Co2(L(2))2]·6(CH3CN) (2), [Zn2(L(1))2]·2(CH3CN)·(CH3OH) (3) and [Zn2(L(2))2]·4(CH3CN) (4) were synthesized and characterized. Detailed dc and ac magnetic susceptibility measurements reveal the presence of field induced slow magnetic relaxation behaviour in high spin tetrahedral Co(II) centres with an easy-plane magnetic anisotropy. Complexes 1 and 2 are the rare examples of transition metal based helicates showing such behaviour. Furthermore, 3 and 4 exhibit fluorescence emission in different solvents that are analyzed in terms of fluorescence quantum yields and lifetimes.
合成并表征了一类罕见的具有四面体金属中心的双核双链螺旋配合物，其化学式为[Co₂(L(1))₂]·2(CH₃CN) (1)、[Co₂(L(2))₂]·6(CH₃CN) (2)、[Zn₂(L(1))₂]·2(CH₃CN)·(CH₃OH) (3) 和 [Zn₂(L(2))₂]·4(CH₃CN) (4)。详细的直流和交流磁化率测量表明，在具有易平面磁各向异性的高自旋四面体Co(II)中心存在场诱导的慢磁弛豫行为。配合物1和2是表现出这种行为的基于过渡金属的螺旋配合物的罕见例子。此外，配合物3和4在不同溶剂中表现出荧光发射，并根据荧光量子产率和寿命进行了分析。
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