ABSTRACT
A series of novel organically templated metal sulfates, [C(5)H(14)N(2)][M(II)(H(2)O)(6)](SO(4))(2) with (M(II) = Mn (1), Fe (2), Co (3) and Ni (4)), have been successfully synthesized by slow evaporation and characterized by single-crystal X-ray diffraction as well as with infrared spectroscopy, thermogravimetric analysis and magnetic measurements. All compounds were prepared using a racemic source of the 2-methylpiperazine and they crystallized in the monoclinic systems, P2(1)/n for (1, 3) and P2(1)/c for (2,4). Crystal data are as follows: [C(5)H(14)N(2)][Mn(H(2)O)(6)](SO(4))(2), a = 6.6385(10) Å, b = 11.0448(2) Å, c = 12.6418(2) Å, ß = 101.903(10)°, V = 906.98(3) Å(3), Z = 2; [C(5)H(14)N(2)][Fe(H(2)O)(6)](SO(4))(2), a = 10.9273(2) Å, b = 7.8620(10) Å, c = 11.7845(3) Å, ß = 116.733(10)°, V = 904.20(3) Å(3), Z = 2; [C(5)H(14)N(2)][Co(H(2)O)(6)](SO(4))(2), a = 6.5710(2) Å, b = 10.9078(3) Å, c = 12.5518(3) Å, ß = 101.547(2)°, V = 881.44(4) Å(3), Z = 2; [C(5)H(14)N(2)][Ni(H(2)O)(6)](SO(4))(2), a = 10.8328(2) Å, b = 7.8443(10) Å, c = 11.6790(2) Å, ß = 116.826(10)°, V = 885.63(2) Å(3), Z = 2. The three-dimensional structure networks for these compounds consist of isolated [M(II)(H(2)O)(6)](2+) and [C(5)H(14)N(2)](2+) cations and (SO(4))(2-) anions linked by hydrogen-bonds only. The use of racemic 2-methylpiperazine results in crystallographic disorder of the amines and creation of inversion centers. The magnetic measurements indicate that the Mn complex (1) is paramagnetic, while compounds 2, 3 and 4, (M(II) = Fe, Co, Ni respectively) exhibit single ion anisotropy.
ABSTRACT
The crystal structure of the title compound, (C(5)H(14)N(2))[ZnCl(4)]·0.5H(2)O, is built up from discrete 1-methyl-piperazine-diium cations with chair conformation, tetrahedral tetrachloridozincate anions and uncoordinated solvent water mol-ecules linked together by three types of inter-molecular hydrogen bonds, viz. N-Hâ¯Cl, N-Hâ¯O and O-Hâ¯Cl.
ABSTRACT
The title compound, namely octaaquaytterbium(III) aquanonachlorotricadmate(II) hexahydrate, [Yb(H(2)O)(8)][Cd(3)Cl(9)(H(2)O)].6H(2)O, was prepared by evaporation at 278 K from an aqueous solution of the ternary system YbCl(3)-CdCl(2)-H(2)O and was characterized by elemental chemical analysis and by X-ray powder and single-crystal diffraction studies. The crystal structure can be viewed as being built from layers of double chains of CdCl(6) and CdCl(5)(H(2)O) octahedra separated by antiprismatic [Yb(H(2)O)(8)](3+) cations. The stabilization of the structure is ensured by O-H.O and O-H.Cl hydrogen bonds. A comparison with the structures of SrCd(2)Cl(6).8H(2)O and CeCd(4)Cl(11).13H(2)O is presented.
ABSTRACT
The ternary system SrBr(2)-CdBr(2)-H(2)O was investigated at room temperature. The title phase, SrCd(2)Br(6) x 8H(2)O, has been isolated from this system and its structure determined by single-crystal X-ray diffraction. The structure consists of infinite double chains of CdBr(6) octahedra and chains of Sr(H(2)O)(9) polyhedra packed along the b axis. The interaction between these two isolated chains occurs through O-H.O and O-H...Br hydrogen bonds. The structure is compared with that of SrCd(2)Cl(6) x 8H(2)O.
