Abstract
Two dinuclear lanthanide complexes [Dy2(L1)6(L2)2]·2EtOH (1) and [Tb2(L1)6(L2)2]·2EtOH (2) (HL1 = phenoxyacetic acid and L2 = 2,2′-bipyridine) were synthesized and the crystal structures were determined. In both complexes, the lanthanide centers are nine-coordinated and have a muffin geometry. Detailed magnetic study reveals the presence of field-induced single molecule magnet (SMM) behavior for complex 1, whereas complex 2 is non-SMM in nature. Further magnetic study with 1′, yttrium doped magnetically diluted sample of 1, disclosed the presence of Orbach and Raman relaxation processes with effective energy barrier, ∆E = 16.26 cm−1 and relaxation time, τo = 2.42 × 10−8 s. Luminescence spectra for complexes 1 and 2 in acetonitrile were studied which show characteristic emission peaks for DyIII and TbIII ions, respectively.
Highlights
Limitless research interest has been involved in the investigation of single-molecule magnets (SMMs) or molecule-based magnetic materials to date
It has been claimed that this special class of materials could be explored in terms of several potential applications, such as high-density data storage, quantum computing, molecular spintronics, cryogenic magnetic refrigeration, fabrication of nanoscopic molecular devices, etc. [1,2,3,4,5,6]
Recent research trends show the prior use of lanthanides to design and construct attractive single molecule magnet (SMM), especially for their unquenched orbital angular momentum, large spin ground state, crystal field effect, and single-ion anisotropy [10,11,12]
Summary
Limitless research interest has been involved in the investigation of single-molecule magnets (SMMs) or molecule-based magnetic materials to date. These two important parameters always heavily affect the magnetic relaxations pathways In this regard, smallest lanthanide clusters, namely dinuclear lanthanide SMMs, could be a suitable system to study the interference between single ion anisotropy and magnetic exchange interactions in detail [20,21,22,23,24]. Smallest lanthanide clusters, namely dinuclear lanthanide SMMs, could be a suitable system to study the interference between single ion anisotropy and magnetic exchange interactions in detail [20,21,22,23,24] In this sense, some exciting reports have been documented in the literature. Solution-state photoluminescence studies of the complexes were performed
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