Two manganese(II) coordination polymers driven by (iso)nicotinoyl-hydrazone blocks and pseudohalide ancillary ligands: syntheses, structural features, and magnetic properties

Abstract

<p>Two coordination polymers, [Mn₂(μ-L¹)₂(μ-N₃)₂]_n (<b>1</b>) and [Mn(μ-HL²)(SCN)₂]_n (<b>2</b>), were assembled in a single-pot from MnCl₂·4H₂O, HL¹ (2-acetylpyridine isonicotinoylhydrazone) or HL² (2-acetylpyridine nicotinoylhydrazone) and ancillary ligand sources (NaN₃ or NH₄NCS). The products were fully characterized, including by single-crystal X-ray diffraction, which revealed a 2-D metal–organic layer in <b>1</b> and a 1-D zigzag coordination chain in <b>2</b>. Both <b>1</b> and <b>2</b> are constructed from six-coordinate Mn(II) nodes that adopt distorted octahedral (MnN₅O) environments; the adjacent nodes are driven by the μ-L¹ and μ-N₃ linkers in <b>1</b> or μ-HL² linkers in <b>2</b> to form different metal–organic networks. Their topological classification was performed, disclosing the <b>hcb</b> and <b>2C1</b> topology in <b>1</b> and <b>2</b>, respectively. Different weak non-covalent interactions promote dimensionality extension. Variable-temperature magnetic susceptibility measurements were carried out, revealing weak ferromagnetic and antiferromagnetic interactions in <b>1</b> and <b>2</b>, respectively.</p