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Synthesis, characterization and catalytic applications of tridentate Schiff base derivatives of bis and mono(cyclopentadienyl)‐lanthanocene complexes
Author(s) -
Yousaf Muhammad,
Liu QianCai,
Huang JiLing,
Qian YanLong
Publication year - 2000
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20000180515
Subject(s) - chemistry , cyclopentadienyl complex , monomer , lanthanide , isomerization , ligand (biochemistry) , schiff base , polymer chemistry , medicinal chemistry , methyl methacrylate , polymerization , catalysis , polymer , organic chemistry , ion , biochemistry , receptor
Seven kinds of lanthanocene complexes were prepared by the reaction of tridentate Schiff base | N ‐(2‐methoxyphenyl)salicylideneamine with tris(cyclopentadienyl) lanthanide tetrahydrofuranate or bis (cyclopentadienyl) lanthanide chloride tetrahydrofuranate in THF. All the complexes were characterized by MS, EA and IR respectively. The structure of |Cp 2 LnC 14 U 13 NO 2 ) Ln = Sm, Dy, Y, Er| (1–4) was further confirmed by X‐ray determination of Cp 2 Sm(C 14 H 13 NO 2 ) (1) which indicates that the complex is monomeric in which central metal is coordinatively saturated by two cyclopentadienyl rings, two oxygens and one nitrogen of the ligand. The isomerization of 1,5‐hexadiene explains that complexes (1–4) isomerize this monomer into a mixture of 1,4‐hexadiene, 2,4‐hexadiene, 1,3‐hexadiene, methylenecyclopentane and methyl–cyclopentene. Similarity complexes |CpLn(a) C 14 H 13 NO 2 ) (THF) (Ln=Sm, Dy, Y, Er)| (5–7) polymerize methyl‐methacrylate (MMA) to give polyMMA (PMMA) in 51.8% yield and high molecular weight (274 × 10 3 ), which shows narrow molecular weight distributions and partially syndiotactic.