Anomalous adsorption of biomolecules on a Zn-based metal–organic framework obtained via a facile room-temperature route

Abstract

Herein, we report a new method for the crystal growth of two Zn-based MOFs at room temperature (known MOF-5 and a new modification of [{Zn2(TBAPy)(H2O)2}·3.5DEF]n (1)) by employing slow diffusion conditions. Employing both Zn-based MOFs with different pore morphology made it possible to discover an anomalous adsorption of L-histidine in of up to 24.3 × 10(15) molecules cm(-2) at 25 °C. This is one of the first reports aimed not only at describing a new method for the targeted formation of crystalline MOFs and coordination polymers, but also at demonstrating the use of Zn-based MOFs as potential drug delivery materials, with highly effective adsorption of l-histidine given herein as an example.

Response to Comment “On the Existence of Excitonic Signatures in the Optical Response of Metal–Organic Frameworks”

“…In summary, the comment raises a problem of describing the nature of optical effects in organic–inorganic materials, which is very important for the development of new applications of such materials. In the case of layered van der Waals' metal–organic frameworks, the extensive experimental data and theoretical/experimental results from other groups allow us to confidently assign the observed optical phenomena to excitonic transitions supporting the original proposal on the principle possibility of the all‐optical data processing and storage in 1 .…”

“…In contrast, the PL from single‐particle transitions normally demonstrates a spatially homogeneous picture independently of the degree of inhomogeneity of the substrate. In our case, we attribute the spatially inhomogeneous PL to the defects because of the highly defected nature of the MOF crystals fabricated by a solvo‐thermal method . Furthermore, the formation of an exciton liquid requires a higher concentration of excitons than we had in our experiments (see below).…”

van der Waals Metal‐Organic Framework as an Excitonic Material for Advanced Photonics

“…In view of the above it appears that the superposition of organic–inorganic nature and spatial anisotropy in a single crystal is a promising approach for the development of new photonic devices based on the concept of exciton manipulation by light at room temperature. To demonstrate this, we used the metal‐organic framework [{Zn 2 (TBAPy)(H 2 O) 2 }⋅3.5DEF] n ( 1 ) (TBAPy: 1,3,6,8‐tetrakis( p ‐benzoate)pyrene; DEF: diethylformamide) combining both the layered van der Waals structure and organic–inorganic nature, as well as having cuboid shape with thickness of 0.2–2 µm (see Figure a,b). The crystal structure of 1 is formed by planar 2D coordination polymer layers, in which the carboxylate moieties of the TBAPy ligands provide equatorial coordination to dual Zn 2+ centers within the layers, while the open axial positions are occupied by H 2 O molecules.…”

POM & MOF‐based Electrocatalysts for Energy‐related Reactions

“…[177] In recent years, the growing importanceo fs ustainabilitya nd green chemistry has led to the development of novel room temperature strategies for MOF preparation. [178][179][180][181][182][183][184][185] For the application of MOFs in catalysis, post-synthetic purification/activation treatments are crucial owing to impurities of reaction, by-products and solventm olecules that can retrogress their absorption capacities by blocking pores.…”