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Synthesis and Structures of N‐Heterocyclic Carbene–Sulfonate Ruthenium Complexes and Their Applications in the Ring‐Opening Metathesis Polymerization of Norbornene
Author(s) -
Li Minliang,
Song Haibin,
Wang Baiquan
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500499
Subject(s) - norbornene , chemistry , ruthenium , romp , carbene , sulfonate , polymer chemistry , metathesis , polymerization , ring opening metathesis polymerisation , ring opening polymerization , differential scanning calorimetry , gel permeation chromatography , nuclear magnetic resonance spectroscopy , polymer , organic chemistry , catalysis , physics , sodium , thermodynamics
A series of N‐heterocyclic carbene–sulfonate (NHC–sulfonate) p ‐cymene ruthenium complexes ( 2a – 2d ) were synthesized in high yields from the reactions of NHC–sulfonate ligands with Ag 2 O and [( p ‐cymene)RuCl 2 ] 2 . All of the complexes were characterized fully by 1 H and 13 C NMR spectroscopy, high‐resolution mass spectrometry, and elemental analysis. The molecular structures of 2b and 2d were determined by single‐crystal X‐ray diffraction analysis. Upon activation with Et 2 AlCl, the ruthenium complexes 2a – 2d showed excellent activities for the ring‐opening metathesis polymerization of norbornene and produced polymers with high molecular weights and narrow molecular weight distributions. Complex 2a can also efficiently catalyze the copolymerization of norbornene and cyclooctene. All of the obtained polymers were characterized by 1 H and 13 C NMR spectroscopy, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC).