New 4,5-dichlorophthalhydrazidate-bridged chained coordination polymers

The hydrothermal self-assemblies of Pb2+/Cd2+ salt, 4,5-dichlorophthalic acid (dcpha), N2H4·H2O together with 1,10-phenanthroline·H2O (phen) or 2,2′-bipyridine (bpy) generated two new monoacylhydrazidate-bridged 1-D chained coordination polymers [Pb2(DCPTH)4(phen)2] 1 and [Cd3(DCPTH)2(dcph)2(bpy)2] 2 (DCPTH=4,5-dichlorophthalhydrazidate, dcph=4,5-dichlorophthalate). The monoacylhydrazidate ligand DCPTH originated from the hydrothermal in situ acylation reaction between dcpha and N2H4·H2O. In compound 1, two types of coordination modes for DCPTH are found, which link alternately the Pb(II) centers into a 1-D chain structure of compound 1 with ancillary phen molecules. In compound 2, DCPTH and dcph as the mixed bridges extend the Cd(II) centers into a 1-D chain structure of compound 2 with auxiliary bpy molecules. DCPTH in compound 2 shows a different coordination mode from those observed in compound 1.

By applying the in situ acylation reaction between 4,5-diclorophthalic acid and N2H4·H2O, two 4,5-dichlorophthalhydrazidate-bridged chained compounds [Pb2(DCPTH)4(phen)2] and [Cd3(DCPTH)2(dcph)2(bpy)2] (4,5-dichlorophthalhydrazidate=DCPTH, and dcph=4,5-dichlorophthalate) were hydrothermally synthesized.Figure optionsDownload as PowerPoint slideResearch highlights
► In this article, we first reported the preparations and structural characterization of two examples of 4,5-dichlorophthalhydrazidate-bridged chained coordination polymers [Pb2(DCPTH)4(phen)2] 1 and [Cd3(DCPTH)2(dcph)2(bpy)2] 2. 4,5-dichlorophthalhydrazidate derived from the hydrothermal in situ acylation reactions between 4,5-dichlorophthalic acid and N2H4·H2O.
► In this article, a simple method to judge whether the polycarboxylic acid precursors have acylated into the acylhydrazidate ligands is introduced.
► In this article, DFT calculations were carried out on the excited electronic states of the compounds, the fluorescence emission properties of the compounds have been better understood.
► this article, by the structural characterization of the obtained monoacylhydrazidate-containing compounds, the character of the monoacylhydrazidate ligands has been further understood.