Bis(4-aminopyridinium) bis(oxalato-κ²O,O′)cuprate(II) dihydrate

Abstract

The CuII atom in the title salt, (C5H7N2)2[Cu(C2O4)2]·2H2O, is located on a center of inversion and is chelated by two oxalate groups in a square-planar coordination geometry. The cation, anion and water mol­ecules inter­act through hydrogen bonds, forming a three-dimensional hydrogen-bonded network.

Synthesis, structure and magnetic properties of two bis(oxalato)cuprate(ii) salts with pyridinium type counter ions

“…These distances and angles are akin to those found in some reported Cu( ii ) oxalate salts featuring similar coordination motifs. 23,24…”

“…These distances and angles are akin to those found in some reported Cu(II) oxalate salts featuring similar coordination motifs. 23,24 The packing of 1 shows strong interlocking between complex anion and cationic sub-lattices through a multidirectional hydrogen bonding network. The organic cations, (C 5 H 7 N 2 O) + , link adjacent copper oxalate anions via hydrogen bonding interactions N2-H2⋯O2, N1-H1A⋯O6 and O1-H1C⋯O3 to form a 1D chain in the x-direction (Table 2).…”

“…These distances and angles are akin to those found in some reported Cu(II) oxalate salts featuring similar coordination motifs. 23,24 The packing of 1 shows strong interlocking between complex anion and cationic sub-lattices through a multidirectional hydrogen bonding network. The organic cations, ( 25 and aminoguanidinium 26 ; the length of the Cu-O axial bond (Cu-O7 = 2.454(2) Å) is consistent with the ones in known aminoguanidinium 26 and potassium 27 salts and normal for a Jahn-Teller Cu-O bond.…”

One-dimensional magnetism in a facile spin 1/2 Heisenberg antiferromagnet with a low saturation field

“…In this work, we report the synthesis of single crystals of a facile spin 1/2 AfHc system, (C 5 H 7 N 2 ) 2 [Cu(C 2 O 4 ) 2 ]·2H 2 O (abbreviated as CuD henceforth), with a moderate value of exchange coupling constant J / k B = 1.23 K and saturation field H s = 1.75 T. The structure has been reported previously in ref. 33 but no other details of the system was given. Our single crystals were grown using the technique liquid–liquid diffusion that resulted in the growth of large sized single crystals with a 100% yield.…”