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      https://www.ias.ac.in/article/fulltext/jcsc/127/02/0257-0264

    • Keywords

       

      Mixed ligand system; Co(II)-based 3D framework; interpenetrated structure; sql/Shubnikov tetragonal plane net topology; non-covalent interactions; magnetic studies.

    • Abstract

       

      A new Co(II)-based three-dimensional (3D) framework having the molecular formula [Co(C4O4)(4-bpmh))H2O)2]n·2nH2O·2nMeOH·(1)(4-bpmh = N, N-bis-pyridin-4-ylmethylene-hydrazine) has been synthesized using a mixed ligand system and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, single crystal X-ray diffraction and variable temperature magnetic study. The framework is constructed by the bridging squarate (C4O2−4) and N, N-bis-pyridin-4-ylmethylene-hydrazine (4-bpmh) ligands and interpenetration of the 2D grid-like frameworks at definite angles gives rise to 2D$\to$3D inclined polycatenation with sql/Shubnikov tetragonal plane net topology. Extensive non-covalent interactions (H-bonding as well as 𝜋$\cdots$𝜋 interactions) are also observed which stabilises the 3D arrangement. Additionally, complex 1 contains 1D channels of large dimensions (10.91 × 11.78 Å2) that runs along the b-axis. Variable temperature DC magnetic susceptibility study reveals dominant spin–orbit coupling effect typical of the 4T1g ground state of octahedral high-spin Co(II) ion at a higher temperature range.

    • Author Affiliations

       

      Soumyabrata Goswami1 Amit Kumar Mondal1 Sanjit Konar1

      1. Department of Chemistry, IISER Bhopal, Indore By-pass Road, Bhauri, Bhopal 462 066, India
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