| Autor: |
Biswas, Biplab, Siddiqui, Anjila I., Majee, Mithun Chandra, Saha, Swadhin Kumar, Mondal, Biswajit, Saha, Rajat, Gómez García, Carlos J. |
| Zdroj: |
Inorganic Chemistry; 20240101, Issue: Preprints |
| Abstrakt: |
We present a bifunctional heptanuclear cobalt(II)/cobalt(III) molecular complex formulated as [Co7(μ3–OH)4(H2L1)2(HL2)2](NO3)6·6H2O (1) (where H5L1is 2,2′-(((1E,1′E)-((2-hydroxy-5-methyl-1,3-phenylene)bis(methanylylidene))bis(azanylylidene))bis(propane-1,3-diol)) and H2L2is 2-amino-1,3-propanediol). Compound 1has been characterized by single-crystal X-ray diffraction analysis along with other spectral and magnetic measurements. Structural analysis indicates that 1contains a mixed-valence Co7cluster where a central Co(II) ion is connected to six different Co centers (four CoIIIand two CoIIions) by four μ3–OH groups, giving rise to a planar heptanuclear cluster that resembles a molecular fragment of a layered double hydroxide (LDH). Two triply deprotonated (H2L1)3–ligands form the outer side of the cluster while two singly deprotonated (HL2)−ligands are located at the top and bottom of the central heptanuclear core. Variable temperature magnetic measurements indicate the presence of weak ferromagnetic CoII···CoIIinteractions (J= 3.53(6) cm–1) within the linear trinuclear CoIIcluster. AC susceptibility measurements show that 1is a field-induced single-molecule magnet (SMM) with τ0= 8.2(7) × 10–7s and Ueff= 11.3(4) K. The electrocatalytic hydrogen evolution reaction (HER) activity of 1in homogeneous phase shows an overpotential of 455 mV, with a Faradaic efficiency of 81% and a TOF of 8.97 × 104μmol H2h–1mol–1. |
| Databáze: |
Supplemental Index |
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