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1D Copper(II)-Aroylhydrazone Coordination Polymers: Magnetic Properties and Microwave Assisted Oxidation of a Secondary Alcohol.


ABSTRACT: 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.

SUBMITTER: Sutradhar M 

PROVIDER: S-EPMC7069101 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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1D Copper(II)-Aroylhydrazone Coordination Polymers: Magnetic Properties and Microwave Assisted Oxidation of a Secondary Alcohol.

Sutradhar Manas M   Alegria Elisabete C B A ECBA   Barman Tannistha Roy TR   Guedes da Silva M Fátima C MFC   Liu Cai-Ming CM   Pombeiro Armando J L AJL  

Frontiers in chemistry 20200306


The 1D Cu(II) coordination polymers [Cu<sub>3</sub>(L<sup>1</sup>)(NO<sub>3</sub>)<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>]<sub>n</sub> (<b>1</b>) and [Cu<sub>2</sub>(H<sub>2</sub>L<sup>2</sup>)(NO<sub>3</sub>)(H<sub>2</sub>O)<sub>2</sub>]<sub>n</sub>(NO<sub>3</sub>)<sub>n</sub> (<b>2</b>) have been synthesized using the aroylhyrazone Schiff bases <i>N'</i> <sup>1</sup>,<i>N'</i> <sup>2</sup>-bis(pyridin-2-ylmethylene)oxalohydrazide (H<sub>2</sub>L<sup>1</sup>) and <i>N'</i> <sup>1</sup>,<i>N'</  ...[more]

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