Syntheses of mono and bimetallic cyamelurate polymers with reversible chromic behaviour

Abstract

MOPs and MMOPs were synthesized in water and their crystals exhibit switchable chromic behaviour and reversible solid-state structural transformations.

Metal cyamelurates: structural diversity caused by kinetic and thermodynamic controls

“…Solution of 0. (M=Ni(II), Zn(II)) described in [4] were unsuccessful and led to the phases we already received [3]. However, in one of our experiments with manganese cyamelurate, we found a phase identical to [Mn(H…”

“…The crystal structures of poorly soluble salts of cyameluric acid have hardly been studied as well. It was previously shown [3] that the formation of a thermodynamically stable crystalline modification of zinc cyamelurate, [Zn(H 2 O) 6 ][Zn(H 2 O) 4 (C 6 N 7 O 3 H) 2 ] [4], proceeds in several stages: (i) formation of the initial metastable phase, [ZnK 2 (H 2 O) 8 (C 6 N 7 O 3 H) 2 ], from building blocks existing in aqueous solutions of precursors; (ii) transformation of the initial metastable phase into the second phase, [Zn(H 2 O) 5 (C 6 N 7 O 3 H)], via complexation reaction; (iii) hydrate isomerization of the latter into the final thermodynamically stable product. It was suggested [3] that the synthesis of zinc, nickel, and iron cyamelurates occurs in double electric micelles, which act as nanoreactors.…”

“…, where M=Mn(II), Co(II), Ni(II), Zn(II) (all four compounds are isostructural), are described in [4]. We classified them as thermodynamically stable for the reasons stated in our previous article [3].…”

“…In a work [30], the synthesis conditions were slightly different from that of samples in the work [4], and diverse results were obtained: similar powder patterns of nickel and zinc cyamelurates clearly differed from the powder pattern of manganese cyamelurate, and the chemical composition of manganese cyamelurate contained potassium, while Zn(II), Ni(II), Co(II) cyamelurates did not contain stoichiometric amounts of potassium [30].…”

A new covalent organic polymer used to highly selective detection of Fe3+ions

“…Different ions will cause different environmental and health problems, and the materials with specific and selective selection of Fe3+ ions are worthy to attention. To date, there are many materials used to act as sensors to detect metal ions, such as metal-organic polymers (MOPs) [13][14][15][16] and small organic molecules [17][18][19][20]. However, covalent organic polymers act as sensors to detect Fe3+ ions are rarely reported, a COP with excellent selective ability to Fe3+ ions is promising to design.…”