Investigating the chemical sensitivity of melting in zeolitic imidazolate frameworks

Abstract

The number of zeolitic imidazolate frameworks (ZIFs) that form melt-quenched glasses remains limited, with most displaying the cag network topology. Here, we expand our studies to zni topology ZIFs, starting...

Regulating thermal dynamics and gas transport of metal‐oraganic framework glass through silver composites

“…This is because the first upscan was only performed up to 500°C, which is below ZIF‐zni melting temperature (576°C). Therefore, the ZIF‐zni formed in AgZIF‐62‐a did not melt and no T g was observed in the second upscan 39 …”

“…Therefore, the ZIF-zni formed in AgZIF-62-a did not melt and no T g was observed in the second upscan. 39 This analysis shows that the Ag to bIm ratio is very important to control the melting of ZIF-62, either to form a complete melt or to form a recrystallized and more thermodynamically stable ZIF-zni. It is also important to note that the Ag compounds in all AgZIF-62 variants start to form Ag nanoparticles at temperatures between 150 and 200 C.…”

Thermally activated structural phase transitions and processes in metal–organic frameworks

“…On the other hand, trace amounts of 5-aminobenzimidazolate (abIm) into the ZIF- zni structure creates a new material, [Zn(Im) 1.995 (abIm) 0.005 ], which melts at 842 K (a lower temperature than that of pristine ZIF-4 zni ) with no evidence of decomposition to zinc oxide. 122…”

“…On the other hand, trace amounts of 5-aminobenzimidazolate (abIm) into the ZIF-zni structure creates a new material, [Zn(Im) 1.995 (abIm) 0.005 ], which melts at 842 K (a lower temperature than that of pristine ZIF-4 zni) with no evidence of decomposition to zinc oxide. 122 The most well-known approach for reducing T m is partial substitution of the imidazolate ligand by another imidazolederived linker, such as benzylimidazolate (bIm À ) in the structure. This led to the idea of exploring the thermal behaviour of ZIF-62, [Zn(Im) 2Àx (bIm) x ] (Im À = imidazolate, x = 0.1-0.3).…”

Green Synthesis Approaches toward Preparation of ZIF-76 and Its Thermal Behavior

“…Glass formation ability was tested for both samples, ZIF-76 RT and ZIF-76 BM. Due to ZIF-76's lack of a liquid stage in melting, 34 samples were pelletized before thermal treatment in a muffle furnace. The pelletized samples were then heated to 400 °C in argon and left to cool to room temperature.…”