Ligand concentration-dependent supramolecular complexes with uncoordinated carbonyl groups based on a new pyrazole carboxylic acid ligand

<div><p>One new pyrazole-based ligand, 1-carboxymethyl-3,5-dimethyl-1H-pyrazole-4-carboxylic acid (H₂cmdpca), has been synthesized and characterized. Structural analysis reveals that H₂cmdpca crystallizes in the monoclinic system and adopts a 3-D supramolecular network via the interaction of intermolecular hydrogen bonds. The reactions of Cd(II) ions with H₂cmdpca and 4,4′-bipyridine (4,4′-bpy) afforded three metal complexes, [Cd(4,4′-bpy)(Hcmdpca)₂(H₂O)₃]·H₂O (<b>1</b>), [Cd(4,4′-bpy)(Hcmdpca)₂(H₂O)]·3H₂O (<b>2</b>), and [Cd(4,4′-bpy)(Hcmdpca)₂(H₂O)] (<b>3</b>). Structural analyses reveal that these complexes are all monoclinic and <b>1</b>, <b>2</b>, and <b>3</b> exhibit mononuclear, 1-D chain, and 1-D with binuclear loop structures, respectively, which are further assembled into 3-D supramolecular frameworks through non-covalent interactions. <b>1</b> and <b>2</b> are true supramolecular isomers, while <b>2</b> and <b>3</b> are “pseudo-supramolecular” isomers. In addition, the thermal stability and luminescent properties of the complexes are also investigated.</p></div

MOESM1 of Metabolic engineering of Escherichia coli for production of (2S,3S)-butane-2,3-diol from glucose

Additional file 1: Figure S1. Verification of recombinant vectors.Figure S2. Time course of byproducts production from glucose using whole cells of E. coli BL21 (pETDuet-PT7-bud B-PT7-bud C) with Fe3+ addition. Table S1. Cost analyses of various (2S,3S)-2,3-BD production processes