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New Types of Metal Squarato-phosphonates:  Condensation of Aminodiphosphonate with Squaric Acid under Hydrothermal Conditions

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posted on 2005-02-07, 00:00 authored by Bing-Ping Yang, Jiang-Gao Mao
The syntheses and crystal structures of the first copper(I) phosphonate, Cu2(H3L)(bipy)2·2H2O 1 (H5L = C4HO3N(CH2PO3H2)2), which is also the first example of metal phosphonates formed by a type of organic reaction, and a novel luminescent Mn(II) squarate diphosphonate, {Mn[NH(CH2PO3H)2](H2O)2}2{Mn(C4O4)(H2O)4}·(C4H2O4) 2, have been reported. The structure of 1 features a layer architecture in which the Cu(I) centers are three coordinated, and the newly formed ligand acts as a bidentate metal linker. Compound 2 is composed of 1D chains of Mn[NH(CH2PO3H)2](H2O)2, 1D chains of {Mn(C4O4)(H2O)4}, as well as the neutral squaric acid molecules. These three types of building units are interconnected via hydrogen bonding.