Bis(propane-1,2-diammonium) benzene-1,2,4,5-tetra­carboxyl­ate dihydrate

In the crystal of the title hydrated molecular salt, 2C3H12N2 2+·C10H2O8 4−·2H2O, the packing is stabilized by extensive N—H⋯O and O—H⋯O hydrogen-bonding inter­actions involving all three species, forming a supra­molecular three-dimensional structure. The tetraanion is generated by inversion

Binuclear paddle-wheel platinum(II) and platinum(III) complexes containing 4-methyl-4H-1,2,4-triazole-3-thiol ligand: Synthesis, X-ray studies, and spectroscopic characterization

<p>The complex [Pt₂(μ-mtrzt)₄(mtrzt)₂] (<b>1</b>) was synthesized from the reaction of a mixture of 4-methyl-4H-1,2,4-triazole-3-thiol (Hmtrzt) and ethylenediamine (en) with K₂PtCl₄ in CH₃OH/H₂O (2:1) as solvent. The complex [Pt₂(μ-mtrzt)₄] (<b>2</b>) was synthesized by the same procedure as described for preparation of complex <b>1</b> but in the absence of ethylenediamine. Both complexes were characterized by elemental analysis, IR,¹H NMR,¹³C{¹H}NMR, UV-Vis, as well as luminescence spectroscopy and their structures were analyzed by single-crystal X-ray diffraction method. The X-ray structure determinations show that complexes of <b>1</b> and <b>2</b> have binuclear structures in a <i>paddle</i>-<i>wheel</i> fashion with Pt-Pt distances of 2.6628(7) and 2.7977(16)Å, respectively. In complex <b>1</b>, each platinum(III) atom has a distorted octahedral coordination geometry with the sulfur atom and the second platinum subunit in axial positions and two nitrogen and two sulfur atoms in equatorial positions. Also, in complex <b>2</b>, each platinum(II) atom has a distorted square-pyramidal coordination geometry with the second platinum subunit in axial position and two nitrogen and two sulfur atoms in equatorial positions. In addition, intermolecular C‒H···N and C‒H···S hydrogen bonds in <b>1</b> and <b>2</b> as well as intermolecular anagostic C‒H···Pt and C‒H···π interactions in <b>2</b> are effective in the stabilization of the crystal packing of these complexes.</p