Abstract
The one-dimensional coordination polymer (I) [Sr(ib)2(H2mda)] n (Hib = isobutyric acid, C4H8O2, and H2mda = N-methyldi-ethano-lamine, C5H13NO2), namely, catena-poly[[(N-methyldi-ethano-lamine-κ3 O,N,O')strontium(II)]-di-μ2-isobutyrato-κ3 O,O':O;κ3 O:O,O'], was prepared by the one-pot aerobic reaction of [Zr6O4(OH)4(ib)12(H2O)]·3Hib with Sr(NO3)2 and H2mda in the presence of MnCl2 and Et3N in aceto-nitrile. The use of MnCl2 is key to the isolation of I as high-quality colorless crystals in good yield. The mol-ecular solid-state structure of I was determined by single-crystal X-ray diffraction. Compound I crystallizes in the monoclinic space group P21/c and shows a one-dimensional polymeric chain structure. Each monomeric unit of this coordination polymer consists of a central SrII ion in the NO8 coordination environment of two deprotonated ib- ligands and one fully protonated H2mda ligand. The C and O atoms of the H2mda ligand were refined as disordered over two sets of sites with site occupancies of 0.619 (3) and 0.381 (3). Compound I shows thermal stability up to 130°C in air.
Highlights
The one-dimensional coordination polymer (I) [Sr(ib)2(H2mda)]n (Hib = isobutyric acid, C4H8O2, and H2mda = N-methyldiethanolamine, C5H13NO2), namely, catena-poly[[(N-methyldiethanolamine-3O,N,O0)strontium(II)]-di-2isobutyrato-3O,O0:O;3O:O,O0], was prepared by the one-pot aerobic reaction of [Zr6O4(OH)4(ib)12(H2O)]Á3Hib with Sr(NO3)2 and H2mda in the presence of MnCl2 and Et3N in acetonitrile
Each monomeric unit of this coordination polymer consists of a central SrII ion in the NO8 coordination environment of two deprotonated ibÀ ligands and one fully protonated H2mda ligand
The C and O atoms of the H2mda ligand were refined as disordered over two sets of sites with site occupancies of 0.619 (3) and 0.381 (3)
Summary
[MnII4MnIII2(ib)8(Hbda)2(bda)2] (H2bda = N-butyldiethanolamine), [MnII4CoIII2(ib)8(Hmda)2(mda)2] (Malaestean et al, 2010), [CoII3CoIII2(Hbda)2(bda)2(ib)6]Á2MeCN and [NiII4(Hbda)3(ib)5(MeCN)] (Schmitz et al, 2016), [GdIII4MII8(OH)8(Lig)8(ib)8](ClO4) (M = ZnII or CuII, HLig = 2-(hydroxymethyl)pyridine); Hooper et al, 2012) and [Cr3O(ib)6(H2O)3](NO3) (Parsons et al, 2000) The formation of these polynuclear homo- and heterometallic complexes was enabled by the introduction of flexible amino alcohol ligands into the reaction mixtures (Schmitz et al, 2016; Malaestean et al, 2010). We describe here the first example of a coordination polymer composed of monomeric SrII units that are supported by both isobutyrate and amino alcohol ligands This makes the synthesized compound [Sr(ib)2(H2mda)]n (I) an appealing precursor for reactions with transition metal and lanthanide complexes. Symmetry codes: (i) 2 À x, 1 À y, 1 À z; (ii) 1 À x, 1 À y, 1 À z
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