Coordination-based vapochromic behavior of a luminescent Pt(ii) complex with potassium ions

Abstract

A luminescent Pt(ii) complex with potassium ions was successfully synthesized and its coordination-based vapochromic behavior was investigated.

Mechanical and Thermal ON–OFF Switching of the Vapochromic Behavior of a Luminescent Polymorphic Pt(II) Complex

“…All the commercially available starting materials were used as received without further purification. 2-(3-Chlorophenyl)-4-chloropyridine (HppyCl 2 ) was synthesized according to a previously published method . The 1 H NMR spectrum of each sample in the solution state was recorded using a JEOL ECS400 NMR spectrometer at 20 °C.…”

“…Polymorphism is an attractive characteristic of crystals because polymorphs exhibit properties different from those of their respective crystal structures, and therefore, their formation must be controlled to obtain desired properties. − Recently, crystalline systems that exhibit crystal structure transformations between polymorphs or pseudopolymorphs in response to external stimuli have gained considerable attention. − These stimuli-responsive systems, also known as “soft crystals”, have the ability to change their properties upon crystal structure transformation and possess potential applications in molecular devices . Chromic systems, which exhibit color/luminescence changes induced by external stimuli, have drawn much attention because of their potential usage in memory and sensor devices.…”

“…2-(3-Chlorophenyl)-4-chloropyridine (HppyCl 2 ) was synthesized according to a previously published method. 32 The 1 H NMR spectrum of each sample in the solution state was recorded using a JEOL ECS400 NMR spectrometer at 20 °C. Elemental analyses were conducted at the Advanced Science Research Center of Kanazawa University.…”

“…Chromic systems, which exhibit color/luminescence changes induced by external stimuli, have drawn much attention because of their potential usage in memory and sensor devices. Various stimuli-based chromic systems have been reported, for instance, mechanical stimuli (mechanochromism) − and vapor exposure (vapochromism)-based systems. − These systems have been widely studied over the past few decades and are frequently found in coordination complexes. ,− ,− , …”

“…The adsorbed guest molecules and/or crystal structural transformation affect the electronic state of the host molecule, causing changes in color/luminescence. Various types of vapochromic materials, in which the responses depend on the adsorption of guest molecules, have been reported, including coordination complexes, − inorganic compounds, − and organic molecules. − This pseudopolymorph-based vapochromic behavior usually reflects the current environment because guest molecules are desorbed at low vapor pressures. However, in some cases, vapochromic responses are observed via vapor-induced structural transformations between polymorphs, without further vapor adsorption. , This type of response requires indirect molecular recognition by chromophores, and the intermolecular interactions between host molecules play a key role in the color change.…”