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Synthesis and Structure of Dimeric anthracene-9-carboxylato Bridged Dinuclear erbium(III) Complex, [Er(2)(9-AC)(6)(DMF)(2)(H(2)O)(2)]

Synthesis and Structure of Dimeric anthracene-9-carboxylato Bridged Dinuclear erbium(III) Complex, [Er(2)(9-AC)(6)(DMF)(2)(H(2)O)(2)]

Eny Kusrini, Rohana Adnan, Muhammad I Saleh, Lim-Kong Yan, Hoong-Kun Fun

Spectrochim Acta A Mol Biomol Spectrosc. 2009 May;72(4):884-9.

PMID: 19167268

Abstract:

We study the influence of the bulky aromatic rings, e.g. anthracence-9-carboxylic acid (9-ACA) with a large conjugated pi-system on the structure and spectroscopic properties of [Er(2)(9-AC)(6)(DMF)(2)(H(2)O)(2)] complex where 9-AC=anthracence-9-carboxylato and DMF=N,N'-dimethylformamide. The complex has been prepared from the erbium chloride and 9-ACA in the mixture of H(2)O:DMF solution (4:1, v/v) followed by pH adjustment to 6. The complex is crystallized in a monoclinic system with space group P2(1)/n. The two Er(III) ions are double bridged by the deprotonated carboxyl groups of two 9-AC anions (O1 and O1A), forming an eight-coordination number. The chelating bidentate (O,O), chelating-bridging tridentate (O,O,O') and monodentate of 9-AC anions are observed in the dinuclear [Er(2)(9-AC)(6)(DMF)(2)(H(2)O)(2)] complex. The Er-Er distance is 4.015A in the dimeric unit. Intramolecular O-Hcdots, three dots, centeredO and C-Hcdots, three dots, centeredO hydrogen bonds as well as numerous of intermolecular C-Hcdots, three dots, centeredpi interactions between the anthracene rings by edge-to-face interactions linked the dinuclear dimeric units into two-dimensional supramolecular network in a propeller-arrangement. Electronic absorption spectra of the Er(III) complex and its salt were measured. The emission spectrum of the complex is composed of a broad band due to the emission of intraligand pi*-->pi transition from the 9-AC anions and a shoulder peak originating from the 4f-4f emission transition of the Er(III) ions. The complex has a high thermal stability which can be attributed to the effectively increase the rigidity of the 9-AC anions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP10138417	Erbium(III) chloride		10138-41-7	Price

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