Strong Effects of Higher-Valent Cations on the Structure of the Zeolitic Zn(2-methylimidazole)₂ Framework (ZIF-8)

Abstract

ARTICLEcations. The univalent metal cations showed no effect on the structure of ZIF-8, whereas the bivalent or higher-valent metal cations caused the collapse of the ZIF-8 crystal structure. Therefore, the structural stability of ZIF-8 is considered when it is subjected to the application, in which high-valent metal cations are involved.

Surface defection reduces cytotoxicity of Zn(2-methylimidazole)2 (ZIF-8) without compromising its drug delivery capacity

“…As a representative ZIF, Zn(2-methylimidazole) 2 (ZIF-8) possesses a sodalite zeolite-type structure with large pores (11.6 Å in diameter), which are connected by apertures (3.4 Å in diameter). Our previous publications have revealed that bivalent cations result in a structural collapse of ZIF-8, and even water causes a gradual change in ZIF-8 crystal structure 22, 23 . Because of the large pore size, high surface area, as well as its degradability in aqueous environment, ZIF-8 has attracted much attention for delivering both hydrophilic and hydrophobic drugs, including 5-fluorouracil 24 , doxorubicin 25 , and several other drugs 26 .…”

H2O-Functionalized Zeolitic Zn(2-methylimidazole)2 Framework (ZIF-8) for H2 Storage

“…1,6,7,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] The tunable pore structures and ultrahigh surface areas of MOFs constitute their suitability for gas separation and storage. 1, 6, 7, 15-25 Zeolitic imidazolate frameworks(ZIFs), which are an interesting type of MOFs, are constructed with tetrahedral units of one bivalent metal M 2+ cations (usually Zn 2+ ) and four imidazolate anions (Im -) analogous to {SiO 2 } tetrahedra in zeolites.…”

A Robust Infinite Zirconium Phenolate Building Unit to Enhance the Chemical Stability of Zr MOFs

“…[1,2] Ah uge effort is still invested in the design of new porous and functional frameworks for targeted applications,a lthough their chemical stability,especially in aqueous media [3] remains av ery challenging issue.L ow et al showed that the bond strength between the metal cation M n and the organic linker is one of the main criteria that drives the hydrothermal stability of MOFs. [4] Competitive species (such as carboxylates in the case of the separation of complex mixture from the biomass, or phosphates in bio-applications,b ut also cations [5] )c ould also play ac ritical role and profoundly affect the performances of the solid.…”