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A Novel One-Dimensional Copper Mellitate Complex Featured by {Cu(H 2 O) 2 (urea)[C 6 (COO) 4 (COOH) 2 ]} n 2 n - Polyanions

Authors
Type
Published Article
Journal
Zeitschrift für anorganische und allgemeine Chemie
0044-2313
Publisher
Wiley Blackwell (John Wiley & Sons)
Volume
641
Issue
11
Pages
1886–1891
Identifiers
DOI: 10.1002/zaac.201500231
Keywords
  • Magnetism
  • Complexes
  • Inorganic Chemistry
  • Coordination Polymer
  • Dta
  • Coordination Chemistry
  • Polyanion
  • Mellitate
  • Mellitic Acid
  • Benzenehexacarboxylic Acid
  • Tg
  • Copper Complex
  • Crystal Growth
  • Single Crystal
  • Hydrogen Bonds

Abstract

Blue monoclinic single crystals of the novel one-dimensional [H 3 N-(CH 2) 6-NH 3 ][Cu(H 2 O) 2 (urea)(µ 2-C 6 (COO) 4 (COOH) 2)]*H 2 O coordination polymer have been prepared in aqueous solution at room temperature in the presence of 1,6-diaminohexane and urea. Space group P2 1 /n (no. 14) with a = 958.48(9), b = 1465.74(11), c = 1821.14(12) pm, beta = 97.655(8)°. The Cu 2+ cation is coordinated in a square pyramidal manner by two oxygen atoms stemming from the dihydrogen mellitate tetraanion, one oxygen atom from the urea molecule, and two water molecules. The Cu−O distances are between 193.3(2) and 229.4(2) pm. The connection between Cu 2+ and [C 6 (COO) 4 (COOH) 2 ] 4 yields infinite chain-like polyanions parallel to [-101] with a composition of {Cu(H2O)2(urea)[C6(COO)4(COOH)2]}n 2n-. The dihydrogen mellitate tetraanion adopts a μ2 coordination mode. The [(H3N-(CH2)6-NH3)]2+ cations are accommodated between the chains as counter cations. The hexane-1,6-diammonium cations adopt a partial synclinal conformation. The chains are connected by strong and weak hydrogen bonds. Magnetic measurements reveal a paramagnetic Curie-Weiss behaviour and a magnetic moment of 1.93μB per Cu2+. Thermoanalytical investigations in air show that the complex is stable up to 135 °C. Following decomposition processes yielding CuO.

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