A novel coordination polymer with an unusual [3 ¡Á 2] oblique copper(II) grid: [Cu₂(HBIMAM)₂(C₄O₄)₃(H₂O)₂]_n¡¤2nH₂O [BIMAM = bis(imidazol

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• 作者：Emilio Escriv&aacute ; ^a ; ^{emilio.escriva@uv.es} ; Lucí ; a Soto^a ; Juan Server-Carrió ; ^a ; Carlos J. Gó ; mez-Garcí ; a^b ; ^{carlos.gomez@uv.es} ; Guillermo Mí ; nguez Espallargas^b ; Nailette Ruiz^c ; Amparo Sancho^a ; Julia Garcí ; a-Lozano^a ; Carmen Ramí ; rez de Arellano^d
• 关键词：2-D coordination polymer ; [3  ; × ;   ; 2] Oblique grid ; Bis(imidazolyl) ligands ; Squarate bridge ; Magnetic properties
• 刊名：Polyhedron
• 出版年：2013
• 出版时间：12 June, 2013
• 年：2013
• 卷：56
• 期：Complete
• 页码：90-95
• 全文大小：919 K

文摘

This paper reports the synthesis, X-ray structure and magnetic characterization of [Cu₂(HBIMAM)₂(C₄O₄)₃(H₂O)₂]_n¡¤2nH₂O [BIMAM = bis(imidazol-2-yl)methylamino methane]. This compound is made of infinite chains - running along the [1 1 0] direction - with copper ions bridged by ¦Ì_1,3-squarato ligands. Furthermore, these chains are further cross-linked through additional squarate anions (with the same ¦Ì_1,3-bis(monodentate) bridging mode) to generate two-dimensional sheets parallel to the ab plane. There are inter-chains links every two copper atoms in a chain, forming an unusual (3 ¡Á 2) oblique copper(II) grid. Magnetic susceptibility measurements in the range 2-300 K show weak antiferromagnetic exchange interactions. A detailed analysis of the structure shows that the more appropriate model to be used to reproduce the magnetic properties is a regular S = 1/2 antiferromagnetic chain model including an inter-chain interaction (j¡ä). Finally, the observed magnetic behavior (J_chain = ?0.97(1) cm^?1 and j¡ä = ?0.03(1) cm^?1) is compared with that observed in related hexacoordinated copper(II) compounds containing ¦Ì_1,3-squarato bridges.