Altering Thermochromic Transition Temperature in Transition Metal Ethylenediamine Complexes by Substitutional Doping of Anionic Species
摘要:
Tunable thermochromic materials comprise a metal salt with a varying proportion of two different anions and an organic ligand. Partial substitution via doping during the initial synthesis with a macro-structurally similar (generating an isostructural material) yet chemically different anion creates a material with altered thermochromic properties. For example, in bromide-doped bis(N,N′-diethylethylenediamine)nickel(II)) tetrafluoroborate; both the tetrafluoroborate (BF4—) and bromide (Br—) derivatives are isostructural. Substitution of BF4— for Br— causes a decrease in the materials' thermochromic transition temperature by approximately 10° C.