The first suberato-bridged lanthanide coordination polymer: synthesis, crystal structure and properties of La 2 (H 2 O) 2 L 3 (H 2 L=HOOC(CH 2 ) 6 COOH)

Author： Zheng Y.-Q. Sun J. Wang Y.-F.

Publisher： Taylor & Francis Ltd

ISSN： 0095-8972

Source： Journal of Coordination Chemistry, Vol.58, Iss.17, 2005-11, pp. : 1551-1559

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Abstract

Reaction of suberic acid (H 2 L?=?HOOC(CH 2 ) 6 COOH), LaCl 3 and NaOH at 170°C yielded La 2 (H 2 O) 2 L 3 . The complex is triclinic, space group P , with a ?=?8.246(1), b ?=?13.463(2), c ?=?14.073(2)?Å, a?=?104.29(1)°, ß?=?105.07(1)°, ??=?93.61(1)°, Z ?=?2, V ?=?1448.4(3)?Å 3 , R 1 ?=?0.0324 and wR 2 ?=?0.0723 for 5319 observed reflections ( I ?=?2s( I )) of 6597 unique reflections. The crystal structure features infinite lanthanum oxide chains of edge-sharing (LaO 9 ) mono-capped square antiprisms, in which La atoms are coordinated by nine oxygen atoms of six suberate anions and one water molecule at the cap with d(La–O)?=?2.475–2.666?Å. The chains are bridged by the dicarboxylate anions to form a 3D, nonporous framework and interchain hydrogen bonding interactions between the capping water and carboxylate oxygen atoms contribute to the stabilization of the crystal structure. Thermogravimetric and IR properties are presented.