Synthesis, spectroscopic and catalytic properties of some new boron hybrid molecule derivatives by BF2 and BPh2 chelation
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Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
A new series of Schiff base ligands (L-1-L-3) and their corresponding fluorine/phenyl boron hybrid complexes [LnBF2] and [LnPh2] (n=1, 2 or 3) have been synthesized and well characterized by both analytical and spectroscopic methods. The Schiff base ligands and their corresponding fluorine/phenyl boron hybrid complexes have been characterized by NMR (H-1, C-13 and F-19), FT-IR, UV-Vis, LC-MS, and fluorescence spectroscopy as well as melting point and elemental analysis. The fluorescence efficiencies of phenyl chelate complexes are greatly red-shifted compared to those of the fluorine chelate analogs based on the same ligands, presumably due to the large steric hindrance and hard pi ->pi* transition of the diphenyl boron chelation, which can effectively prevent molecular aggregation. The boron hybrid complexes were applied to the transfer hydrogenation of acetophenone derivatives to 1-phenylethanol derivatives in the presence of 2-propanol as the hydrogen source. The catalytic studies showed that boron hybrid complexes are good catalytic precursors for transfer hydrogenation of aromatic ketones in 0.1 M iso-PrOH solution. Also, we have found that both steric and electronic factors have a significant impact on the catalytic properties of this class of molecules. (C) 2015 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Boron Hybrid Complexes, Schiff Bases, Fluorescence, Transfer Hydrogenation, Spectroscopy
Kaynak
Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
142
