5 research outputs found
De Novo Tailoring Pore Morphologies and Sizes for Different Substrates in a Urea-Containing MOFs Catalytic Platform
To better understand
the structure–catalytic property relationship,
a platform of urea-containing MOFs with diverse topologies as hydrogen-bonding
(H-bond) catalyst has been well established in the present work. During
the construction of MOFs, we proposed a new strategy called the isoreticular
functionalization approach in which the desired topological net is
first considered as a blueprint, and then two predesigned functionalized
polydentate ligands link to four different metal clusters by de novo
routes to achieve the MOFs with expected pore structure and catalytic
sites. By means of this strategy, we successfully synthesized four
programmed MOFs (named as <b>URMOF-1–4</b>) with diverse
topologies, pore morphologies, and sizes and distribution of active
sites. Subsequently, we systematically investigated the Friedel–Crafts
reactions of 1-methylpyrrole or 1-methylindole with nitroalkene derivatives
with diverse sizes to assess the catalytic properties of the above-mentioned
URMOFs. These four URMOFs can act as reusable H-bond catalysts and
show varied catalytic capacities and size-selectivity properties.
Most significantly, the open morphologies of pores, large channels
in the framework, and effective distribution of active sites on the
wall of the channel are proved to facilitate catalysis. This urea-containing
MOF catalytic platform provides new insight into the catalytic properties
of MOFs with the same kind of active sites but diverse topologies,
pore morphologies, and sizes and distributions of catalytic sites
In Situ Construction of a Coordination Zirconocene Tetrahedron
The
current study describes the first in situ synthesis and characterization
of a new family of cationic coordination tetrahedra of both the V<sub>4</sub>F<sub>4</sub> and V<sub>4</sub>E<sub>6</sub> type, which are
constructed by a new building block based on a trinuclear zirconocene
moiety and the dicarboxylate or tricarboxylate anions
A Water and Thermally Stable Metal–Organic Framework Featuring Selective CO<sub>2</sub> Adsorption
A 2-fold
interpenetrated microporous MOF [Ni<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)Â(L)<sub>2</sub>]<sub><i>n</i></sub>·6<i>n</i>H<sub>2</sub>O (HL = 4,2′:4″,2′-terpyridine-4′-carboxylic
acid) (<b>1</b>) was synthesized and structurally characterized. <b>1</b> has obvious 1D channels along the crystallographic <i>a</i> and <i>c</i> axes with a pore size of 5.7 to
6.9 Ã…. Topological analysis shows that the framework of <b>1</b> can be interpreted as a (3,4)-connected net with point symbol
(6<sup>3</sup>)Â(6<sup>5</sup>·8). <b>1</b> exhibits high
water and thermal stability, which is demonstrated by TGA, PXRD, and
VT-PXRD. Additionally, the high temperature structure of <b>1</b>′ (433 K) undoubtedly demonstrates the stability of the framework.
More importantly, <b>1</b> shows high selectivities for CO<sub>2</sub> over N<sub>2</sub>, H<sub>2</sub>, and CH<sub>4</sub> at
low pressure and 273 K
In Situ Construction of a Coordination Zirconocene Tetrahedron
The
current study describes the first in situ synthesis and characterization
of a new family of cationic coordination tetrahedra of both the V<sub>4</sub>F<sub>4</sub> and V<sub>4</sub>E<sub>6</sub> type, which are
constructed by a new building block based on a trinuclear zirconocene
moiety and the dicarboxylate or tricarboxylate anions
In Situ Construction of a Coordination Zirconocene Tetrahedron
The
current study describes the first in situ synthesis and characterization
of a new family of cationic coordination tetrahedra of both the V<sub>4</sub>F<sub>4</sub> and V<sub>4</sub>E<sub>6</sub> type, which are
constructed by a new building block based on a trinuclear zirconocene
moiety and the dicarboxylate or tricarboxylate anions