1D copper (II)-aroylhydrazone coordination polymers: magnetic properties and microwave assisted oxidation of a secondary alcohol

M Sutradhar, ECBA Alegria, TR Barman… - Frontiers in …, 2020 - frontiersin.org
Frontiers in Chemistry, 2020frontiersin.org
The 1D Cu (II) coordination polymers [Cu3 (L1)(NO3) 4 (H2O) 2] n (1) and [Cu2
(H2L2)(NO3)(H2O) 2] n (NO3) n (2) have been synthesized using the aroylhyrazone Schiff
bases N'1, N'2-bis (pyridin-2-ylmethylene) oxalohydrazide (H2L1) and N'1, N'3-bis (2-
hydroxybenzylidene) malonohydrazide (H4L2), respectively. They have been characterized
by elemental analysis, infrared (IR) spectroscopy, UV-Vis spectroscopy, electrospray
ionization mass spectrometry (ESI-MS), single crystal X-ray diffraction and variable …
The 1D Cu(II) coordination polymers [Cu3(L1)(NO3)4(H2O)2]n (1) and [Cu2(H2L2)(NO3)(H2O)2]n(NO3)n (2) have been synthesized using the aroylhyrazone Schiff bases N'1,N'2-bis(pyridin-2-ylmethylene)oxalohydrazide (H2L1) and N'1,N'3-bis(2-hydroxybenzylidene)malonohydrazide (H4L2), respectively. They have been characterized by elemental analysis, infrared (IR) spectroscopy, UV-Vis spectroscopy, electrospray ionization mass spectrometry (ESI-MS), single crystal X-ray diffraction and variable temperature magnetic susceptibility measurements (for 2). The ligand (L1)2− coordinates in the iminol form in 1, whereas the amide coordination is observed for (H2L2)2− in 2. Either the ligand bridge or the nitrate bridge in 2 mediates weak antiferromagnetic coupling. The catalytic performance of 1 and 2 has been investigated toward the solvent-free microwave-assisted oxidation of a secondary alcohol (1-phenylethanol used as model substrate). At 120°C and in the presence of the nitroxyl radical 2,2,6,6-tetramethylpiperydil-1-oxyl (TEMPO), the complete conversion of 1-phenylethanol into acetophenone occurs with TOFs up to 1,200 h−1.
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