Hydrogen bond supramolecular self-assembly in nickel(II) dithiophosphates, Ni[S2P(OR)2]2, R=sec-Bu, iso-Bu, and their bis(pyrazole) adducts
2010; Elsevier BV; Volume: 363; Issue: 15 Linguagem: Inglês
10.1016/j.ica.2010.07.017
ISSN1873-3255
AutoresL. Bolundut, Ionel Haiduc, E. Ilyes, Gabriele Kociok‐Köhn, Kieran C. Molloy, Santiago Gómez‐Ruiz,
Tópico(s)Crystallography and molecular interactions
ResumoThe reaction between nickel(II) nitrate and potassium phosphorus-1,1-dithiolates (di-sec-butyl and di-iso-butyl) in methanol yields 2:1 complexes which were characterized by FT-IR and NMR spectroscopy. 2:1 pyrazole adducts of both compounds were also obtained. The X-ray diffraction analysis of the compounds reveals square planar, four-coordination geometry for the homoleptic compounds and a six-coordinated distorted octahedral geometry for the adducts. In Ni[S2P(OBus)2]2 the molecules are associated through C–H⋯O hydrogen bonds (2.652 Å), and in Ni[S2P(OBui)2]2 the molecules are associated through C–H⋯S hydrogen bonds (2.948 Å). The pyrazole adducts are associated through N–H⋯O bonds and N–H⋯S bonds from the pyrazole nitrogen atoms, to form supramolecular assemblies. Thus, Ni[S2P(OBus)2(Pz)2]2 (Pz = pyrazole) forms bi-dimensional layers through N–H⋯O and N–H⋯S bonds (2.502 and 2.965 Å, respectively), whereas Ni[S2P(OBui)2(Pz)2]2 forms linear chains with N–H⋯S bonds 2.728 Å. The dithiophosphato groups behave as isobidentate chelating ligands.
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