Supramolecular Structures from Three New Molecular Building Blocks Based on the Protonation/Deprotonation of 3,3-Bis(2-imidazolyl)propionic Acid (HBIP): [H3BIP](C4O4)&

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• 作者：Youness Akhriff ; Juan Server-Carrió ; Julia Garcí ; a-Lozano ; José ; Vicente Folgado ; Amparo Sancho ; Emilio Escrivà ; Pablo Vitoria ; and Lucí ; a Soto
• 刊名：Crystal Growth & Design
• 出版年：2006
• 出版时间：May 2006
• 年：2006
• 卷：6
• 期：5
• 页码：1124 - 1133
• 全文大小：698K
• 年卷期：v.6,no.5(May 2006)
• ISSN：1528-7505

文摘

This paper reports the synthesis, structure solution, and electronic and electron paramagnetic resonance (EPR)characterization of three new HBIP-containing compounds (HBIP = 3,3-bis(2-imidazolyl)propionic acid): [H₃BIP](C₄O₄)·H₂O (1),[Cu(HBIP)₂](HC₄O₄)₂ (2), and [Cu(BIP)₂]·2H₂O (3). The structure of 1, resulting from the cocrystallization of [H₃BIP]²⁺ and SQ^2-,is made up of squarate anions, diprotonated HBIP, and water molecules packed together by multiple-path H-bonding into asupramolecular 3D network. Compounds 2 and 3 constitute the first cases of structurally characterized Cu(II)-HBIP/BIP complexesin which the ligand acts in a tridentate chelating fashion. They consist of Jahn-Teller elongated octahedral mononuclear Cu(II)units packed together into a 3D network driven in each case by a different set of multiple H-bonding paths. These differences in thesupramolecular crystal packing of 2 and 3 arise from the different nature of the uncoordinated counterparts, HSQ^- in 2 vs H₂O in3, which play a critical role in the set of H-bonding interactions. The use of simple anion templation to modify the network topologyis discussed. Electronic and EPR spectra are indicative of an essentially d_x²-y² ground state for the copper(II) ions in 2 and 3.