Halocadmium Clusters with Different Linkage Modes Templated by Methyl Viologen: Structure, Photoluminescence, and Thermochromism

Planar Viologen-Based Crystalline Compounds Showing Heat-Induced Electron Transfer and Thermochromism

“…To probe the δ-dependent heat-induced ET behavior of viologen compounds, we summarized all known viologen compounds with definite crystal structures that showed thermochromism or heat-induced color change (Tables and ). − As can be seen in Tables and and Figure S1, the probability to undergo thermochromism or heat-induced color change is higher for viologens with small δ values than for ones with large δ values, although the reported coloration temperatures are different. Heating temperature, undoubtedly, has a great effect on heat-induced ET for viologen compounds.…”

One Luminescent Cadmium Iodide with Free Bifunctional Azole Sites as a Triple Sensor for Cu2+, Fe3+, and Cr2O72– Ions

“…More intriguingly, 1 shows some special structural features. First, the organic species utilized as SDAs or/and ligands for the preparation of OHCIs are mainly dominated by pyridyl, triazolyl, and imidazolyl derivatives, − but no bifunctional organic species with pyrazinyl and triazolyl groups are applied for the syntheses of OHCIs. Hence, 1 is the only example of OHCIs incorporating bpt – with bifunctional pyrazinyl and triazolyl groups as SDAs and ligands.…”

“…The type of the organic components has a significantly structural directing effect on the frameworks of cadmium iodide components. Generally, protonated organic cations as either ligands or structure-directing agents (SDAs) are particularly preferable for a multiplicity of the anionic species [Cd x I y ] x − y (2 x < y ), as exemplified by simple tetrahedron [CdI 4 ] 2– , − ,, dimers [Cd 2 I 6 ] 2– or [Cd 2 I 7 ] 3– , trimers [Cd 3 I 7 ] − or [Cd 3 I 8 ] 2– , tetramer [Cd 4 I 10 ] 2– , hexamer [Cd 6 I 16 ] 4– , and one-dimensional (1-D) chains ∞ [Cd 2 I 6 ] − ,, or ∞ [Cd 5 I 12 ] 2– , while neutral organic molecules result in the formation of various neutral species [Cd x I 2 x ], such as dimer [Cd 2 I 4 ], hexamer [Cd 6 I 12 ], and 1-D chains ∞ [CdI 2 ], ∞ [Cd 3 I 6 ], and ∞ [Cd 4 I 8 ] . Conversely, OHCIs incorporating the cationic species [Cd x I y ] x − y (2 x > y ) are exceedingly scarce, ,, as a result of synthetic difficulties.…”