Crystal structure and properties of polymeric hexaaqua-<Emphasis Type="Italic">hexakis</Emphasis>-(2-thiobarbiturato)-disamarium(III) |
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| Authors: | N N Golovnev M S Molokeev I V Sterkhova S N Vereshchagin I I Golovneva |
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| Institution: | 1.Siberian Federal University,Krasnoyarsk,Russia;2.Kirensky Institute of Physics, Siberian Branch,Russian Academy of Sciences,Krasnoyarsk,Russia;3.Far Eastern State Transport University,Khabarovsk,Russia;4.Favorsky Institute of Chemistry, Siberian Branch,Russian Academy of Sciences,Irkutsk,Russia;5.Institute of Chemistry and Chemical Technology, Siberian Branch,Russian Academy of Sciences,Krasnoyarsk,Russia;6.Krasnoyarsk State Agrarian University,Krasnoyarsk,Russia |
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| Abstract: | The structure (CIF file CCDC No. 1401886) of the hexaaqua-hexakis(2-thiobarbiturato)-disamarium Sm2(H2O)6(HTBA)6] n polymeric complex (I), where H2ТВА is 2-thiobarbituric acid, is determined; its thermal decomposition and IR spectrum are studied. The crystals of I are monoclinic: a = 14.072(1) Å, b = 10.0842(6) Å, c = 15.323(1) Å, β = 110.408(2)°, V = 2037.9(2) Å3, space group P2/n, Z = 2. All three independent thiobarbiturate anions HTBA– coordinate to Sm3+ through oxygen atoms. To one of independent Sm3+ ions six (two terminal and four bridging) HTBA– ions and two water molecules are coordinated; the second is bonded with four bridging HTBA– and four water molecules, forming square antiprisms. The bridging HТВА–anions arrange antiprisms in layers. The structure is stabilized by hydrogen bonds and a π–π interaction between the HТВА– ions. The topology of the polymer network of I is analyzed. |
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