Predicting Dinitrogen Coupling with a Series of Small Molecules Catalyzed by a Pincer ComplexSubmitted by Jun Zhu on Wed, 06/16/2021 - 08:56
Due to consumption of more than 2% of the world's annual energy supply by Haber–Bosch process and the strongest triple bond (N≡N) in nature, directly coupling N 2 with small molecules is particularly important and challenging, let alone in a catalytic fashion. Here we first demonstrate that a NNN-type pincer phosphorus complex could act as a catalyst to couple dinitrogen with a series of small molecules including carbon dioxide, formaldehyde, N-ethylidenemethylamine, and acetonitrile in the presence of diborane(4) under a mild condition by theoretical calculations.
Probing the Origin of Ambiphilic Reactivity in Osmapentalyne Complexes: Interplay of Ring Strain, Aromaticity, and Phosphonium SubstituentSubmitted by Jun Zhu on Sun, 05/09/2021 - 21:32
Ambiphilic reactivity is a fascinating topic in chemical reactions, attracting considerable interest because ambiphilic reagents can display properties of both nucleophilicity and electrophilicity. However, most of the previous attention has been focused on the characterization of the ambiphilic reactivity, whereas the origin is less understood. Here we carry out thorough density functional theory (DFT) calculations to probe the origin of the ambiphilic reactivity of the carbyne atom in osmapentalynes, observed previously in experiment.
Tuning the hyperconjugative aromaticity in Au(III)-substituted indoliumsSubmitted by Jun Zhu on Sun, 05/09/2021 - 21:27
As a fundamental concept in chemistry, aromaticity has been extended from traditional organics to organometallics. Similarly, hyperconjugative aromaticity (HCA) has also been developed from main group to transition metal systems through the hyperconjugation of the substituents. However, it remains unclear that how the oxidation state of transition metal in the substituents affects the HCA. Herein, we demonstrate via density functional theory calculations that HCA could disappear in indoliums when the Au(I) substituents are changed to the Au(III) ones.
Predicting Dinitrogen Activation via Transition Metal Involved [4 + 2] Cycloaddition ReactionSubmitted by Jun Zhu on Tue, 05/04/2021 - 21:02
As the strongest triple bond in nature, the N≡N triple bond activation has always been a challenging project in chemistry. On the other hand, since the award of the Nobel Prize in Chemistry in 1950, Diels‐Alder reaction has served as a powerful and widely applied tool in the synthesis of natural products and new materials. However, the application of Diels‐Alder reaction to dinitrogen activation remains less developed.
Nucleophilic reactions of osmanaphthalynes with PMe3 and H2OSubmitted by Jun Zhu on Tue, 05/04/2021 - 15:22
Members of a new class of complexes, 2(CF3), 2(H), 2(Br), 2(I), and 2(OCH3), have been synthesized by a one-pot method involving the treatment of osmanaphthalynes bearing corresponding substituents (1(CF3), 1(H), 1(Br), 1(I), and 1(OCH3) with trimethylphosphine (PMe3) and water (H2O).
New Types of Ge2 and Ge4 Assemblies Stabilized by a Carbanionic Dicarborandiyl-Silylene LigandSubmitted by Jun Zhu on Sun, 04/25/2021 - 14:43
The first Ge(0)–Ge(II) germylone–germylene-paired Ge2 complex (LSi)2Ge2 (4) and the molecular Ge4 cluster (LSi)2Ge4 (5) supported by the chelating carbanionic ortho-C,C′-dicarborandiyl-silylene ligand LSi [L = C,C′-C2B10H10, Si = PhC(tBuN)2Si] have been synthesized and isolated via reduction of the corresponding precursors chlorogermyl-germyliumylidene chloride (2), [(LSi)2Ge(Cl)Ge]+Cl–, and (LSi
Systematic Design of a Frustrated Lewis Pair Containing Methyleneborane and Carbene for Dinitrogen ActivationSubmitted by Jun Zhu on Thu, 04/01/2021 - 08:54
Activation of atmospherically abundant dinitrogen (N2) by metal-free species under mild reaction conditions has been one of the most challenging areas in chemistry for decades. Very recent but limited progress in N2 activation by boron species, including two-coordinated borylene and methyleneborane and three-coordinated borole and borane, has been made toward metal-free N2 activation.
Adaptive Aromaticity in MetallasilapentalynesSubmitted by Jun Zhu on Fri, 03/19/2021 - 09:18
Cyclic molecules with 4n + 2 or 4n electrons are aromatic in the lowest singlet state (S0) or the lowest triplet state (T1) according to Hückel and Baird’s rules. Thus, the design of aromatic species in both the S0 and T1 states (termed as adaptive aromaticity) is particularly challenging. In this work, we demonstrate that metallasilapentalynes show adaptive aromaticity supported by structural, magnetic, and electronic indices, in sharp contrast to metallapentalynes, which exhibit aromaticity in the S0 state only.
Isolation of a carbon nanohoop with Möbius topologySubmitted by Jun Zhu on Fri, 03/19/2021 - 09:08
Carbon nanohoop, a class of constrained molecular architecture consisting of linked arene units, has attracted considerable interest from both experimental and theoretical chemists due to their synthetic challenge and aesthetic architectures. Another fascinating and synthetically challenging species, the Möbius-type molecule, has been attracting the scientific community with its elegant structure and aromaticity. Thus, combining two things together, synthesizing a carbon nanohoop with Möbius topology remains more challenging to date.
[Bi6Mo3(CO)9]4−: a multiple local σ-aromatic cluster containing a distorted Bi6 triangular prismSubmitted by Jun Zhu on Fri, 03/19/2021 - 08:43
The first Zintl cluster containing a distorted Bi6 triangular prism, [Bi6Mo3(CO)9]4−, has been synthesized and structurally characterized. Quantum chemical calculations indicated that the distorted cage cluster features multiple local σ-aromaticity.