Synthesis, Crystal Structure, Vibrational and Magnetic Properties of a New Organic–inorganic Hybrid Material: 2-Amonium-methyl-1-Ethylpyrrolidinium Tetrachlorocuprate (II)

Abstract

Synthesis, crystal structure, vibrational study and magnetic properties of the compound (C7H18N2) CuCl4 are reported. The latter crystallizes in the monoclinic system (space group P21, Z = 4) with the following unit cell dimensions: a = 7.569(5) A b = 14.174(5) A, c = 13.193(2) A and β = 105.53(3)∘. Besides, its structure was solved using 5754 independent reflections down to R = 0.0475. The atomic arrangement can be described by alternating organic and inorganic layers stacked in the [\(\bar {1}\)01] direction, made up of tetrahedral of tetrachlorocuprate CuCl\(_{4}^{2-}\) sandwiched between two organic layers. In crystal structure, the inorganic layer, built up by independent monomeric [CuCl4]2−, is connected to the organic ones through hydrogen bonding in order to build a three-dimensional network. The magnetic behavior of (C7H18N2) CuCl4 samples was investigated as a function of temperature and applied field. At hightemperature paramagnetic behavior, and at low temperature, evidence for weak ferromagnetism, reinforced by a hysteresis loop at 2 K is observed. The magnetic behavior of (C7H18N2) CuCl4 is attributed to Cu (II) due to the presence of an active Jahn–Teller effect in the d9 electronic system, which give rise to short-range weak ferromagnetism.