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The first example of a CNC pincer ligand with a central pyridinol ligand is reported in a nickel(ii) complex. This metal complex can be protonated or deprotonated reversibly in situ to switch on or off the photocatalytic performance towards CO2 reduction. The O- substituent appears essential for catalysis.
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http://dx.doi.org/10.1039/C7CC09507D | DOI Listing |
J Org Chem
July 2025
Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli, Tamilnadu 620 024, India.
An efficient strategy for the multicomponent synthesis of pyrimidine analogues has been demonstrated via acceptorless dehydrogenative annulation (ADA) of alcohols utilizing new Ni(II)-NNO pincer complexes as catalysts. The newly formed Ni(II) complexes (-) featuring N^N^O chelating hydrazone ligands are well established through analytical and spectral methods (FT-IR and NMR). Single-crystal X-ray diffraction analysis precisely reveals the NNO coordination fashion and square planar geometry around the metal center.
View Article and Find Full Text PDFJ Org Chem
January 2025
Department of Crystallography, Institute of Chemistry, University of Silesia, 40-006 Katowice, Poland.
A facile, cost-effective, and sustainable synthesis of substituted triazines from primary alcohols by newly synthesized nickel pincer-type complexes (-) has been described. Herein, we report the synthesis of a set of three well-defined Ni(II) O^N^O pincer-type complexes, structurally characterized by analytical, spectral, and X-ray diffraction techniques. Further, the nickel complexes are explored as efficient catalysts (4 mol %) for the construction of 2,4,6-substituted 1,3,5-triazines from readily available alcohols via an acceptorless dehydrogenative coupling (ADC) strategy.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Department of Chemistry, State Key Laboratory of Synthetic Chemistry, CAS-HKU Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
Facile non-radiative decay of low-lying metal-centered (MC) dd excited states has been well documented to pose a significant obstacle to the development of phosphorescent Ni complexes due to substantial structural distortions between the dd excited state and the ground state. Herein, we prepared a series of dinuclear Ni complexes by using strong σ-donating carbene-phenyl-carbene (C C C) pincer ligands, and prepared their dinuclear Pt and Pd analogues. Dinuclear Ni complexes bridged by formamidinate/α-carbolinato ligand exhibit short Ni-Ni distances of 2.
View Article and Find Full Text PDFOrg Biomol Chem
October 2024
Department of Chemistry, Indian Institute of Technology, Roorkee 247667, India.
Herein, we present the first efficient and sustainable multicomponent synthesis (MCS) of 2-pyrazolines using acceptorless dehydrogenation of benzyl alcohols catalysed by nickel(II) catalysts. Two air-stable phosphine free nickel(II) complexes anchored by NNN-type pincer ligands were synthesized and efficiently used in the MCS of 40 distinct pyrazoline derivatives.
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