Crystal structures and hydrogen bonding in the isotypic series of hydrated alkali metal (K, Rb and Cs) complexes with 4-aminophenylarsonic acid
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Smith, Graham
Wermuth, Urs D
Griffith University Author(s)
Year published
2017
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The structures of the alkali metal (K, Rb and Cs) complex salts with 4-aminophenylarsonic acid (p-arsanilic acid) manifest an isotypic series with the general formula [M2(C6H7AsNO3)2(H2O)3], with M = K {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dipotassium], [K2(C6H7AsNO3)2(H2O)3], (I)}, Rb {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dirubidium], [Rb2(C6H7AsNO3)2(H2O)3], (II)}, and Cs {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dirubidium], [Cs2(C6H7AsNO3)2(H2O)3], (III)}, in which the repeating structural units lie across crystallographic mirror planes containing two independent and different ...
View more >The structures of the alkali metal (K, Rb and Cs) complex salts with 4-aminophenylarsonic acid (p-arsanilic acid) manifest an isotypic series with the general formula [M2(C6H7AsNO3)2(H2O)3], with M = K {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dipotassium], [K2(C6H7AsNO3)2(H2O)3], (I)}, Rb {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dirubidium], [Rb2(C6H7AsNO3)2(H2O)3], (II)}, and Cs {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dirubidium], [Cs2(C6H7AsNO3)2(H2O)3], (III)}, in which the repeating structural units lie across crystallographic mirror planes containing two independent and different metal cations and a bridging water molecule, with the two hydrogen p-arsanilate ligands and the second water molecule lying outside the mirror plane. The bonding about the two metal cations in all complexes is similar, one five-coordinate, the other progressing from five-coordinate in (I) to eight-coordinate in both (II) and (III), with overall M-O bond-length ranges of 2.694 (5)-3.009 (7) (K), 2.818 (4)-3.246 (4) (Rb) and 2.961 (9)-3.400 (10) Å (Cs). The additional three bonds in (II) and (III) are the result of inter-metal bridging through the water ligands. Two-dimensional coordination polymeric structures with the layers lying parallel to (100) are generated through a number of bridging bonds involving the water molecules (including hydrogen-bonding interactions), as well as through the arsanilate O atoms. These layers are linked across [100] through amine N-H...O hydrogen bonds to arsonate and water O-atom acceptors, giving overall three-dimensional network structures.
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View more >The structures of the alkali metal (K, Rb and Cs) complex salts with 4-aminophenylarsonic acid (p-arsanilic acid) manifest an isotypic series with the general formula [M2(C6H7AsNO3)2(H2O)3], with M = K {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dipotassium], [K2(C6H7AsNO3)2(H2O)3], (I)}, Rb {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dirubidium], [Rb2(C6H7AsNO3)2(H2O)3], (II)}, and Cs {poly[di-[mu]3-4-aminophenylarsonato-tri-[mu]2-aqua-dirubidium], [Cs2(C6H7AsNO3)2(H2O)3], (III)}, in which the repeating structural units lie across crystallographic mirror planes containing two independent and different metal cations and a bridging water molecule, with the two hydrogen p-arsanilate ligands and the second water molecule lying outside the mirror plane. The bonding about the two metal cations in all complexes is similar, one five-coordinate, the other progressing from five-coordinate in (I) to eight-coordinate in both (II) and (III), with overall M-O bond-length ranges of 2.694 (5)-3.009 (7) (K), 2.818 (4)-3.246 (4) (Rb) and 2.961 (9)-3.400 (10) Å (Cs). The additional three bonds in (II) and (III) are the result of inter-metal bridging through the water ligands. Two-dimensional coordination polymeric structures with the layers lying parallel to (100) are generated through a number of bridging bonds involving the water molecules (including hydrogen-bonding interactions), as well as through the arsanilate O atoms. These layers are linked across [100] through amine N-H...O hydrogen bonds to arsonate and water O-atom acceptors, giving overall three-dimensional network structures.
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Journal Title
Acta Crystallographica Section E
Volume
E73
Copyright Statement
© The Author(s) 2017. For information about this journal please refer to the journal’s website. All articles published in Acta Crystallographica Section E are open access and distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. See http://creativecommons.org/licenses/by/2.0/uk/legalcode
Subject
Other chemical sciences not elsewhere classified