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N , N ′‐Homopiperazinebis(methylenephosphonic Acid) and its Use in the Synthesis of the new Copper Phosphonate [Cu(HO 3 P–CH 2 –NC 5 H 10 N–CH 2 –PO 3 H)]
Author(s) -
Schilling LarsHendrik,
Stock Norbert
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300311
Subject(s) - crystallography , chemistry , tetragonal crystal system , ligand (biochemistry) , molecule , copper , phosphonate , raman spectroscopy , infrared spectroscopy , hydrogen bond , crystal structure , receptor , organic chemistry , optics , biochemistry , physics
The new aminomethylphosphonic acid H 2 O 3 P–CH 2 –NC 5 H 10 N–CH 2 –PO 3 H 2 (H 4 L2 ) was synthesized and characterized in detail. Its reaction with Cu(NO 3 ) 2 · 3H 2 O under hydrothermal conditions led to the formation of the copper phosphonate [Cu(H 2 L2 )], which was structurally characterized by single‐crystal X‐ray diffraction [space group P 2 1 / n , a = 8.4754(17), b = 16.903(3), c = 9.0787(18) Å, β = 106.58(3)°, R 1 = 0.0296, wR 2 = 0.0728]. In the crystal structure each Cu 2+ ‐ion is chelated by one ligand molecule forming tetragonal planar CuO 2 N 2 polyhedra. Coordination by an oxygen atom from an adjacent second ligand molecule leads to [Cu(H 2 L2 )] 2 dimers, which contain tetragonal pyramidal CuO 3 N 2 polyhedra. These dimers are linked by hydrogen bonds to one‐dimensional chains, which are further connected by van der Waals interactions. The compound was further characterized by powder X‐ray diffraction (PXRD), elemental analysis, IR spectroscopy, Raman spectroscopy, and magnetic measurements.