Field-induced slow relaxation of magnetization in a distorted octahedral mononuclear high-spin Co(ii) complex. Issue 7 (26th January 2018)

• Record Type: Journal Article
• Authors: Wei, Hai-Wen; Yang, Qing-Feng; Lai, Xiao-Yong; Wang, Xiao-Zhong; Yang, Tian-Lin; Hou, Qin; Liu, Xiang-Yu
• Is Part Of: CrystEngComm. Volume 20:Issue 7(2018)
• Page Start: 962
• Page End: 968
• Publication Date: 2018-01-26
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce01981e
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : By adopting the strategy of mixed rigid ligands, two novel mononuclear complexes with distorted octahedral geometries are obtained. SIM-type slow magnetic relaxation behavior is observed in Co(ii )-based complexes. Abstract : In this study, we report the syntheses and structures of two new mononuclear coordination complexes ([Co(H2 pimdc)2 (phen)] n (1 ) and [Fe(H2 pimdc)2 (phen)] n (2 ), H2 pimdc = 2-propyl-imidazole-4, 5-dicarboxylate, phen = 1, 10-phenanthroline monohydrate) exhibiting single-ion magnet (SIM) behavior. Single-crystal X-ray diffraction analyses reveal that1 and2 are isomorphic and crystallized in the monoclinic crystal system with the P 21 / n space group. In both structures, the Co(ii )/Fe(ii ) centers adopt distorted octahedral {Co/FeN4 O2 } geometries. In addition, the mononuclear structures of1 and2 are linked by strong intermolecular N–H⋯O hydrogen bonds, leading to the formation of a two-dimensional (2D) sheet in which Co(ii )/Fe(ii ) ions are spatially separated from each other. The study of their magnetism reveals that compound1 presents an easy-plane magnetic anisotropy ( D = +3.47 cm −1 ). Alternating current dynamic susceptibility measurements show that compound1 exhibits field-induced slow relaxation of the magnetization with an effective energy barrier value of 48.49 K.