Two New Copper Complexes by H4AQTC (Anthraquinone-1,4,5,8-tetracarboxylic Acid): Syntheses, Structures and Properties

YAN Wei-Hong* and ZENG Xian-Cai

Chin. J. Struct. Chem. 2021, 40, 349-356  DOI: 10.14102/j.cnki.0254-5861.2011-2923

March 15, 2021

anthraquinone-1,4,5,8-tetracarboxylic acid, di-2-pyridyl ketone, syntheses, crystal structure

ABSTRACT

Two new complexes [Cu(AQTC)0.5(H2O)3]·3H2O}n (1, H4AQTC = anthraquinone-1,4,5,8-tetracar- boxylic acid) and Cu[(Py)2C(OH)2]2(H2AQTC)·2H2O (2, (Py)2CO = di-2-pyridyl ketone) have been prepared and characterized by elemental analyses and IR spectroscopy. X-ray crystallographic studies show that complex 1 crystallizes in monoclinic space group C2/m and complex 2 in monoclinic space group P21/c. Complex 1 features a 1D chain structure by carboxyl oxygen atoms. Complex 2 displays a mononuclear structure and anions and cations are separated. What's interesting is that the ligand of H4AQTC with eight carboxyl oxygen atoms and two quinone oxygen atoms does not directly coordinate with metals, and only exist as a counter-anion in complex 2. Three-dimensional structures of two complexes are formed by intermolecular interactions. The thermogravimetric analyses of two complexes are investigated. The luminescent properties of complex 1 are investigated as well.

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