Citation: Youness Akhriff; Juan Server-Carri\'o; Amparo Sancho; Julia Garc\'ia-Lozano; Emilio Escriv\'a; Luc\'ia Soto (2001). Two Polymeric Compounds Built from Mononuclear and Tetrameric Squarate-Copper(II) Complexes by Deprotonation of 3,3-Bis(2-imidazolyl)propionic Acid (HBIP). Synthesis, Crystal Structure, and Magnetic Characterization of [Cu(HBIP)(BIP)](C4O4)1/2.2H2O and [{Cu(BIP)(OH2)}4(\m-C4O4)](ClO4)2.4H2O. Inorganic Chemistry, 40, pp. 6832-6840.