Synthesis, Characterization and Thermal Analysis of an Organic-Inorganic Hybrid Salt Involving <i>Trans</i>-Diaquabis(oxalato-κ<sup>2</sup><i>O</i><sup>1</sup>,<i>O</i><sup>2</sup>)chromate(III) Complex Anion with Piperidinium as Counter Cation

Abstract

A new organic-inorganic hybrid salt pipéridinium trans-diaquabis(oxalato)chromate(III) tetrahydrate, (C 5 H 10 NH 2 )[Cr(C 2 O 4 ) 2 (H 2 O) 2 ]•4H 2 O (1), has been synthesized in water and characterized by FTIR and UV-Vis spectroscopies, elemental and thermal analyses and by single-crystal X-ray diffraction. 1 crystallizes in the orthorhombic non-centrosymmetric space group Cmc2 1 with the unit cell parameters a = 7.4329(3), b = 9.9356(5), c = 23.6756(11) Å, α = β = γ = 90˚, V = 1748.45(14) Å 3 and Z = 4. The structure of 1 consists of [Cr(C 2 O 4 ) 2 (H 2 O) 2 ] − mononuclear anions, piperidinium cations and uncoordinated water molecules. The Cr III ion in the complex [Cr(C 2 O 4 ) 2 (H 2 O) 2 ] − is coordinated in a slightly distorted octahedral environment by four O atoms from two chelating oxalate dianions in the equatorial plane, and two O atoms from trans-coordinated water molecules occupying the apical positions. In the crystal, N-H⋯O and O-H⋯O hydrogen bond interactions connect the components into a 3-D framework. The IR spectrum of 1 is consistent with the presence of the various molecular building constituents, namely oxalato and aqua ligands, piperidinium cations and solvent water molecules. The UV-Vis spectrum shows two absorption bands around 564 and 416 nm which are

A Novel Chromium(III) Hybrid Salt, Triethylammonium <i>Trans</i>-Diaquabis(Oxalato-<i>κ</i><sup>2</sup>O<sup>1</sup>,O<sup>2</sup>) Chromate(III), (C<SUB>6</SUB>H<SUB>16</SUB>N)[Cr(C<SUB>2</SUB>O<SUB>4</SUB>)<SUB>2</SUB>(H<S

“…Up to now, there has been a significant interest in the synthesis and characte- •nB with A = OrgH + ; B = H 2 O or urea, CO(NH 2 ) 2 ; n ≥ 0 [10] [11] [12] [13] [14].…”

“…To the best of our knowledge, it appears that in this family of compounds, (oxalato)metalate(III) hybrid salts involving protonated acyclic aliphatic amines chains (linear or branched) as organic cations are still poorly characterized in terms of their solid-state structures and properties [14]. We have been investigating this class of salts not only with a view of producing new materials, but also to unravel the subtle structural features that characterize these solids.…”