Hybrid bromide perovskites
(HBPs) have emerged as a promising candidate
in optoelectronic applications, although instability of the materials
under working conditions has retarded the progress toward commercialization.
As a rational approach to address this core issue, we herein report
the synthesis of a series of ultrastable composite materials, wherein
HBP nanocrystals (NCs) have been stabilized within a well-known chemically
stable metal–organic framework (MOF) viz. zeolitic imidazolate
framework (ZIF-8) via a pore-encapsulated solvent-directed (PSD) approach.
The composites maintain their structural integrity as well as photoluminescence
(PL) properties upon dipping into a wide range of polar solvents including
water (even in boiling conditions), prolonged exposure to UV irradiation,
and elevated temperature for longer periods of time. Further, on the
basis of high stability, HBP@MOF composites have been demonstrated
as heterogeneous photocatalysts to degrade toxic organic pollutants
directly in water.
Metal–organic polyhedra (MOPs) are discrete, metal–organic molecular entities composed of edge‐sharing molecular polygons or connected molecular vertices. Unlike the infinite metal–organic coordination networks popularized by metal–organic frameworks (MOFs), spherical MOPs, also known as nanocages, nanospheres, nanocapsules, or nanoballs, are obtained through the self‐organization of metal–carboxylate or metal–pyridine/pyrimidine links to afford cage‐like nanoarchitectures. MOPs offer much promise as porous materials owing to their well‐defined structures and solution processability. However, these advantages become moot if their poor aqueous stability and/or guest‐removal‐induced aggregation handicaps remain unaddressed. The concise premise of this contribution limits our discussion to the design principles in action behind recent developments in stable carboxylate MOPs. To highlight the structure–property relationships between the structural and compositional features of these metal carboxylate polyhedra, related scientific challenges and state‐of‐the‐art research directions for further exploration are presented in brief.
Large-scale uranium extraction from seawater (UES) is widely considered as reconciliation to increasing global energy demand and climate change crises. However, an ideal uranium sorbent combining features of high capacity,...
Water pollution has
attracted worldwide significant attention ever
since the finding of its harmful effects on the whole ecosystem, including
human health. Although several materials are known for selective removal
of specific contaminants, designing a single material that can adsorb
a variety of water contaminants is still a very challenging task due
to a lack of proper design strategies. Herein, we have rationally
designed a new class of anion exchangeable hybrid material where the
nanosized cationic metal–organic polyhedra (MOP) are embedded
inside a porous covalent organic framework (COF) with specific binding
sites for toxic oxoanions. The resulting hybrid material exhibits
very fast and selective sequestration of high as well as trace amount
of a wide range of toxic oxoanions (HAsO
4
2–
, SeO
4
2–
, CrO
4
2–
, ReO
4
–
, and MnO
4
–
) from the mixture of excessive (∼1000-fold) other interfering
anions to well below the permissible drinking water limit. Moreover,
the hybrid cationic nanotrap material can reduce the As(V) level from
a highly contaminated groundwater sample to below the WHO permitted
level.
Weakly blue emitting EAPbBr3 NCs transformed into a highly intense blue material after embedding inside metal–organic gel (MOG) matrix. The nanocomposite showing outstanding stability in water and under UV light for longer period of time.
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