Magnetic properties of dendritic polycarbenes substituted by bulky peripheral groups |
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| Institution: | 1. Department of Chemistry, St. Joseph’s College, Moolamattom, Idukki, India;2. International and Interuniversity Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, India;3. School of Chemical Sciences, Mahatma Gandhi University, Kottayam, India;1. University of Arkansas, 345 N. Campus Drive, Fayetteville, AR 72701, USA;2. University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada;1. Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN19QJ, UK;2. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;3. Department of Medical Physics, School of Health Sciences, University of Ioannina, 45110 Ioannina, Greece;1. National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guizhou, Guiyang 550014, China;2. College of Material and Metallurgy of Guizhou University, Guizhou, Guiyang 550025, China |
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| Abstract: | As photo-reactive precursors of high-spin organic compounds sterically separated from surroundings by bulky peripheral groups, diphenyldiazomethane derivatives substituted by tetrakis{3,5-bis(benzyloxy)benzyloxy} groups 1, by tetrakis3,5-bis{3′,5′-bis(benzyloxy)benzyloxy}bezyloxy] groups 2, and nonakisdiazo compound associated with ferromagnetic spin couplers substituted by dodecakis{3,5-bis(benzyloxy)benzyloxy} groups 3, were prepared and their magnetic properties after irradiation in their own condensed films were investigated. Field dependences of magnetization and temperature dependences of χT value after irradiation of 1 and 2 clearly exhibited that spin centers i.e., diphenylcarbene parts of 1 and 2 were magnetically isolated from surrounding molecules each other by steric hindrance of the peripheral bulk substituents even in the neat films. In the case of 3, some part of molecules interacted antiferromagnetically with neighboring molecules but a fatal strong antiferromagnetic interaction was also avoided. |
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