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Updated: Jun 5, 2026

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
Published on: October 24, 2017
Low-temperature phase of hexaguanidinium hepta-molybdate monohydrate
Santiago Reinoso1, Michael H Dickman, Antonia Praetorius
1School of Engineering and Science, Jacobs University Bremen, PO Box 750561, 28725 Bremen, Germany.
Abstract:
The crystal structure of the title compound, [C(NH(2))(3)](6)[Mo(7)O(24)]·H(2)O, previously determined at room temperature in the monoclinic space group C2/c from Weissenberg techniques [Don & Weakley (1981 ▶). Acta Cryst. B37, 451-453], has been redetermined from low-temperature single-crystal data in the monoclinic space group P2(1)/c. The asymmetric unit contains one hepta-molybdate anion, six guanidinium cations and one water mol-ecule of hydration. The anions and cations are linked by an extensive network of N-H⋯O hydrogen bonds.
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Colors and Magnetism
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.

