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Crystal structures and hydrogen bonding in the isotypic series of hydrated alkali metal (K, Rb and Cs) complexes with 4-amino-phenyl-arsonic acid.


ABSTRACT: The structures of the alkali metal (K, Rb and Cs) complex salts with 4-amino-phenyl-arsonic acid (p-arsanilic acid) manifest an isotypic series with the general formula [M2(C6H7AsNO3)2(H2O)3], with M = K {poly[di-?3-4-amino-phenyl-arsonato-tri-?2-aqua-dipotassium], [K2(C6H7AsNO3)2(H2O)3], (I)}, Rb {poly[di-?3-4-amino-phenyl-arsonato-tri-?2-aqua-dirubidium], [Rb2(C6H7AsNO3)2(H2O)3], (II)}, and Cs {poly[di-?3-4-amino-phenyl-arsonato-tri-?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 mol-ecule, with the two hydrogen p-arsanilate ligands and the second water mol-ecule 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 mol-ecules (including hydrogen-bonding inter-actions), 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.

SUBMITTER: Smith G 

PROVIDER: S-EPMC5290566 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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Crystal structures and hydrogen bonding in the isotypic series of hydrated alkali metal (K, Rb and Cs) complexes with 4-amino-phenyl-arsonic acid.

Smith Graham G   Wermuth Urs D UD  

Acta crystallographica. Section E, Crystallographic communications 20170117 Pt 2


The structures of the alkali metal (K, Rb and Cs) complex salts with 4-amino-phenyl-arsonic acid (<i>p</i>-arsanilic acid) manifest an isotypic series with the general formula [<i>M</i><sub>2</sub>(C<sub>6</sub>H<sub>7</sub>AsNO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>], with <i>M</i> = K {poly[di-μ<sub>3</sub>-4-amino-phenyl-arsonato-tri-μ<sub>2</sub>-aqua-dipotassium], [K<sub>2</sub>(C<sub>6</sub>H<sub>7</sub>AsNO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>], (I)}, Rb {pol  ...[more]

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