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Haouache Somia Jimenez-Saelices Clara Cousin Fabrice Falourd Xavier Pontoire Bruno Cahier Karine Jrome Franois Capron Isabelle 《Cellulose (London, England)》2022,29(3):1567-1581
Cellulose - Nanocelluloses occur under various crystalline forms that are currently being selectively used for a wide variety of high performance materials. In the present study, two cellulose... 相似文献
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Feng Shao Benjamin Cahier Yi‐Ting Wang Feng‐Lei Yang Eric Rivire Rgis Guillot Nathalie Guihry Jia‐Ping Tong Talal Mallah 《化学:亚洲杂志》2020,15(3):391-397
We report the preparation and the full characterization of a novel mononuclear trigonal bipyramidal CoII complex [Co(NS3iPr)Br](BPh4) ( 1 ) with the tetradentate sulfur‐containing ligand NS3iPr (N(CH2CH2SCH(CH3)2)3). The comparison of its magnetic behaviour with those of two previously reported compounds [Co(NS3iPr)Cl](BPh4) ( 2 ) and [Co(NS3tBu)Br](ClO4) ( 3 ) (NS3tBu=N(CH2CH2SC(CH3)3)3) with similar structures shows that 1 displays a single‐molecule magnet behaviour with the longest magnetic relaxation time (0.051 s) at T=1.8 K, which is almost thirty times larger than that of 3 (0.0019 s) and more than three times larger than that of 2 (0.015 s), though its effective energy barrier (26 cm?1) is smaller. Compound 1 , which contains two crystallographically independent molecules, presents smaller rhombic parameters (E=1.45 and 0.59 cm?1) than 2 (E=2.05 and 1.02 cm?1) and 3 (E=2.00 and 0.80 cm?1) obtained from theoretical calculations. Compounds 2 and 3 have almost the same axial (D) and rhombic (E) parameter values, but present a large difference of their effective energy barrier and magnetic relaxation which may be attributed to the larger volume of BPh4? than ClO4? leading to larger diamagnetic dilution (weaker magnetic dipolar interaction) for 2 than for 3 . The combination of these factors leads to a much slower magnetic relaxation for 1 than for the two other compounds. 相似文献
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