Effect of organic chain length on structure, electronic composition, lattice potential energy, and optical properties of 2D hybrid perovskites [(NH3)(CH2)n(NH3)]CuCl4, n = 2–9

Seham K. Abdel-Aal, Gudrun Kocher-Oberlehner, Andrei Ionov, R. N. Mozhchil

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6 Citations (Scopus)

Abstract

Diammonium series of Cu hybrid perovskites of the formula [(NH3)(CH2)n(NH3)]CuCl4, n = 6–9 are prepared from an ethanolic solution in stoichiometric ratio 1:1 (organic/inorganic). Formation of the desired material was confirmed and characterizes by microchemical analysis, FTIR, XRD and XPS spectra. The structure consists of corner-shared octahedron [CuCl4]2− anion alternative by organic [(NH3)(CH2)n(NH3)]2+ cations. The organic and inorganic layers form infinite 2D sheet that are connected via NH···Cl hydrogen bond. The calculated lattice potential energy Upot (kJ/mol) and lattice enthalpy ΔHL (kJ/mol) are inversely proportional to the molecular volume Vm (nm3) and organic chain length. Optical properties show strong absorption peak at UV–visible range. The band gap energy calculated using Kubelka–Munk equation shows the decrease of the energy gap as organic chain length increases. The introduction of bromide ion to [(NH3)(CH2)n(NH3)]CuCl2Br2 denoted 2C7CuCB hybrid has shifted the energy gap to lower values from 2.6 to 2.18 eV for 2C7CuCl (yellow) and 2C7CuCB (brown), respectively, at the same organic chain length. All elements of [(NH3)(CH2)9(NH3)]CuCl4 and [(NH3)(CH2)7(NH3)]CuCl2Br2 were found in XPS spectra, as well as valence band spectra.

Original languageEnglish
Article number531
JournalApplied Physics A: Materials Science and Processing
Volume123
Issue number8
Early online date20 Jul 2017
DOIs
Publication statusPublished - Aug 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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