Low-dimensional compounds containing cyanido groups. XXVIII. Crystal structure, spectroscopic and magnetic properties of two copper(II) tetracyanidoplatinate complexes with 1,2-diaminopropane

• Two complexes of different compositions from one system have been isolated.
• First complex is of ionic character and second one is of polymeric character.
• Polymeric complex described as a spin chain in contrast to its bilayer structure.

Violet crystals of {[Cu(pn)2]2[Pt(CN)4]}[Pt(CN)4]·2H2O (1, pn=1,2-diaminopropane) and blue crystals of [Cu(pn)Pt(CN)4]n·nH2O (2) were prepared under hydrothermal conditions and characterized using elemental analysis, IR and UV–vis spectroscopy and by X-ray crystal structure analysis. Different number of ν(C≡N) absorption bands of these two compounds reflects their different structures. An X-ray crystal structure analysis has shown that complex 1 is of ionic character and is formed from trinuclear [Cu(pn)2–Pt(CN)4–Cu(pn)2]2+ complex cation and discrete [Pt(CN)4]2– anion together with two molecules of crystal water. On the other hand, complex 2 is of polymeric character and is formed by 2D networks of [Cu(pn)Pt(CN)4]n composition and completed by n molecules of crystal water. Magnetic measurements show the presence of a weak antiferromagnetic exchange interaction in complex 1 (Θ=–0.2 K), while the magnetic susceptibility of complex 2 is well described by the model of uniform S=1/2 spin chain with exchange interaction J/kB=–1.64 K.

Two complexes of different structural types from the system Cu(II) – 1,2–diaminopropane – [Pt(CN)4]2– have been isolated. These were characterized by IR and UV–VIS spectroscopy, X–ray crystal structure analysis together with the magnetic measurements. On one hand {[Cu(pn)2]2[Pt(CN)4]}[Pt(CN)4]∙2H2O is of ionic character and is formed from trinuclear complex cation and discrete anion together with two molecules of crystal water. On the other hand, [Cu(pn)Pt(CN)4]n∙nH2O is of polymeric character and is formed by 2D networks of [Cu(pn)Pt(CN)4]n composition and completed by n molecules of crystal water.Figure optionsDownload as PowerPoint slide