Crystal structure, dielectric, piezoelectric and elastic properties of (±)-tris(ethylenediamine)cobalt(III) nitrate, (±)–[Co(H2N(CH2)2NH2)3](NO3)3
Abstract
Large single crystals of optical quality of (±)-tris(ethylenediamine)cobalt(III) nitrate have been grown from aequeous solutions. An X-ray structure analysis yielded space group Pca21, a1 = 15.441(3) Å, a2 = 8.607(2) Å, a3 = 12.328(2) Å, Z = 4, ϱcalc = 1.724 g cm−3, ϱobs = 1.730 g cm−3. The structure is built up from [Co(H2N(CH2)2NH2)]3+ cations and nitrate anions which are linked by Coulomb interactions and by a three-dimensional network of hydrogen bonds. Two ligands of the cationic chelate complex are disordered. Its probable conformation is Δδλλ or the enantiomorphic Λδδλ.
Pyroelectric, dieletric, piezoelectric and elastic constants have been determined at room temperature. Additionally, we have studied the coefficients of thermal expansion and the thermoelastic constants in the range between 270 K and 350 K. The structure exhibits a nearly trigonal symmetry around the [unk]2-axis. The physical properties obey qualitatively this symmetry. The maximum longitudinal piezoelectric effect surmounts d111 of α-quartz by a factor 10. The largest piezoelectric constant is d113 ≈ 14d111 of α-quartz. Dielectric and elastic constants appear only slightly anisotropic, contrary to a strongly anisotropic thermal expansion.
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Articles in the same Issue
- Coordination sequences for hyperbolic tilings
- Main structural subdivisions and structural formulas of sulphate minerals
- Study of lactonization process in deoxycholic acid analogs by modeling: structure of 3α-acetoxy-24-nor-5β-cholano-12α,24-lactone
- Elastic, thermoelastic and piezoelastic properties of crystals of the KSCN family (KN3, KHF2, KSCN, NH4HF2, NH4SCN)
- Crystal structure, dielectric, piezoelectric and elastic properties of (±)-tris(ethylenediamine)cobalt(III) nitrate, (±)–[Co(H2N(CH2)2NH2)3](NO3)3
- Crystal structure of a cubic Al67Pd11Mn14Si7; a new 1/1 rational approximant for the Al–Pd–Mn icosahedral phase
- Preparation and crystal structure determination of triphenylmethanide cesium · 1.5 dimethoxyethane and of phenothiazine cesium diglyme
- Crystal structure analysis of 4-R-phenyl-2,6-dimethyl-3,5-N-(dimethylcarbamoyl)-1,4-dihydropyridines [R=2-nitro (1), 4-methoxy (2) and 3,4-dichloro (3)]
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