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Tri-μ-sulfato-κO:O'-bis-[aqua-(1,10-phenanthroline-κN,N')indium(III)] dihydrate
Abstract:
In the title dinuclear In(III) compound, [In(2)(SO(4))(3)(C(12)H(8)N(2))(2)(H(2)O)(2)]·2H(2)O, each In(III) cation is coordinated by a 1,10-phenanthroline (phen) ligand, a water mol-ecule and three sulfate O atoms in a distorted InN(2)O(4) octa-hedral geometry. Three sulfate anions bridge two In(III) cations, forming the dinuclear entities. O-H⋯O and weak C-H⋯O hydrogen bonding is observed in the crystal structure. The crystal structure is further consolidated by π-π stacking between nearly parallel phen ring systems [dihedral angle = 4.2 (4)°], the centroid-centroid distance between benzene rings of adjacent phen ligands being 3.528 (9) Å.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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