Two‐dimensional coordination polymeric structures in caesium complexes with ring‐substituted phenoxyacetic acids. Issue 6 (22nd May 2014)

• Record Type: Journal Article
• Authors: Smith, Graham; Lynch, Daniel E.
• Is Part Of: Acta crystallographica. Volume 70:Issue 6(2014:Jun.)
• Page Start: 606
• Page End: 612
• Publication Date: 2014-05-22
• Subjects: Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229614010596
• Languages: English
• ISSNs: 2053-2296

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The two‐dimensional polymeric structures of the caesium complexes with the phenoxyacetic acid analogues (4‐fluorophenoxy)acetic acid, (3‐chloro‐2‐methylphenoxy)acetic acid and the herbicidally active (2, 4‐dichlorophenoxy)acetic acid (2, 4‐D), namely poly[[μ<sub>5</sub>‐(4‐fluorophenoxy)acetato][μ<sub>4</sub>‐(4‐fluorophenoxy)acetato]dicaesium], [Cs<sub>2</sub>(C<sub>8</sub>H<sub>6</sub>FO<sub>3</sub>)<sub>2</sub>]<sub><italic>n</italic></sub>, (I), poly[aqua[μ<sub>5</sub>‐(3‐chloro‐2‐methylphenoxy)acetato]caesium], [Cs(C<sub>9</sub>H<sub>8</sub>ClO<sub>3</sub>)(H<sub>2</sub>O)]<sub><italic>n</italic></sub>, (II), and poly[[μ<sub>7</sub>‐(2, 4‐dichlorophenoxy)acetato][(2, 4‐dichlorphenoxy)acetic acid]caesium], [Cs(C<sub>8</sub>H<sub>5</sub>Cl<sub>2</sub>O<sub>3</sub>)(C<sub>8</sub>H<sub>6</sub>Cl<sub>2</sub>O<sub>3</sub>)]<sub><italic>n</italic></sub>, (III), are described. In (I), the Cs<sup>+</sup> cations of the two individual irregular coordination polyhedra in the asymmetric unit (one CsO<sub>7</sub> and the other CsO<sub>8</sub>) are linked by bridging carboxylate O‐atom donors from the two ligand molecules, both of which are involved in bidentate chelate <italic>O</italic><sub>carboxy</sub>, <italic>O</italic><sub>phenoxy</sub> interactions, while only one has a bidentate carboxylate <italic>O</italic>, <italic>O</italic>′‐chelate interaction. Polymeric extension is achieved through a number of carboxylate O‐atom bridges, with a minimum Cs...Cs separation of 4.3231 (9) Å, giving layers which lie parallel to (001). In hydrated complex (II), the irregular nine‐coordination about the Cs<sup>+</sup> cation comprises a single monodentate water molecule, a bidentate <italic>O</italic><sub>carboxy</sub>, <italic>O</italic><sub>phenoxy</sub> chelate interaction and six bridging carboxylate O‐atom bonding interactions, giving a Cs...Cs separation of 4.2473 (3) Å. The water molecule forms intralayer hydrogen bonds within the two‐dimensional layers, which lie parallel to (100). In complex (III), the irregular centrosymmetric CsO<sub>6</sub>Cl<sub>2</sub> coordination environment comprises two O‐atom donors and two ring‐substituted Cl‐atom donors from two hydrogen bis[(2, 4‐dichlorophenoxy)acetate] ligand species in a bidentate chelate mode, and four O‐atom donors from bridging carboxyl groups. The duplex ligand species lie across crystallographic inversion centres, linked through a short O—H...O hydrogen bond involving the single acid H atom. Structure extension gives layers which lie parallel to (001). The present set of structures of Cs salts of phenoxyacetic acids show previously demonstrated trends among the alkali metal salts of simple benzoic acids with no stereochemically favourable interactive substituent groups for formation of two‐dimensional coordination polymers.</p> </abstract>