The oligomerization of phenyl isocyanate catalyzed by divalent his (methylcyclopentadienyl)samarium complex was studied. The initiating reaction and the effect of coordination environment around the samarium atom were...The oligomerization of phenyl isocyanate catalyzed by divalent his (methylcyclopentadienyl)samarium complex was studied. The initiating reaction and the effect of coordination environment around the samarium atom were mainly discussed. It is found that the initiation reaction has a great influence on the apparent catalytic activity. The oligomers can be split into two fractions. The methanol insoluble fraction is mainly composed of dimers, while the methanol soluble fraction is mainly composed of trimers. Neither SmI2 nor SmI2(hmpa)(4)(hmpa = hexamethylphosphoric triamide) shows catalytic activity for the oligomerization of phenyl isocyanate.展开更多
Reaction of (C5H4Me)3Sm with AgBPh4 in THFDME provides a route to cationic organosamarium complex of . The product is characterized by elemental analysis, infrared spectra and Xray crystallography. Crystallographic ...Reaction of (C5H4Me)3Sm with AgBPh4 in THFDME provides a route to cationic organosamarium complex of . The product is characterized by elemental analysis, infrared spectra and Xray crystallography. Crystallographic data are as follows: formula C88H104B2O6Sm2, FW=158021, monoclinic, space group P21/a, a=17911(4), b=21368(4), c=20894(7) nm, =10177(2), V=7828(3) nm3, Z=4, Dc=1341 gcm-3, (Mo K)=1541 cm-1, F(000)=3256, R=0040, RW=0051. Two centroids of the cyclopentadienyl groups and three oxygen atoms around a samarium atom form a distorted trigonal bipyramid.展开更多
The complex [(η5-CH3C5H4)2Tb(μ-Cl) (THF)]2, has been studied by X-ray crystallography. The crystal is orthorhombic , space group Phcn with a= 20.414(2),b=9. 548(1),c=16.390(6)A.V=3194.9(6) A3, Mr=849.46,Z=4,Dc=1.77 ...The complex [(η5-CH3C5H4)2Tb(μ-Cl) (THF)]2, has been studied by X-ray crystallography. The crystal is orthorhombic , space group Phcn with a= 20.414(2),b=9. 548(1),c=16.390(6)A.V=3194.9(6) A3, Mr=849.46,Z=4,Dc=1.77 g/cm3, F(000)=1664,μ=46.37 cm-1.The Tb3+ ion is coordinated by two CH3C5H4 groups, two chloride ions and one oxygen atom from tetrahydrofuran to form a distorted trigonal bipyramidal geometry. Two bridging Tb-Cl bond lengths are 2. 716(2) and 2.790(2)A,respectively.The Tb-O (THF) and average Tb-C(CH3C5H4) bond lengths are 2.559(6) and 2.670(4)A,respectively.展开更多
文摘The oligomerization of phenyl isocyanate catalyzed by divalent his (methylcyclopentadienyl)samarium complex was studied. The initiating reaction and the effect of coordination environment around the samarium atom were mainly discussed. It is found that the initiation reaction has a great influence on the apparent catalytic activity. The oligomers can be split into two fractions. The methanol insoluble fraction is mainly composed of dimers, while the methanol soluble fraction is mainly composed of trimers. Neither SmI2 nor SmI2(hmpa)(4)(hmpa = hexamethylphosphoric triamide) shows catalytic activity for the oligomerization of phenyl isocyanate.
文摘Reaction of (C5H4Me)3Sm with AgBPh4 in THFDME provides a route to cationic organosamarium complex of . The product is characterized by elemental analysis, infrared spectra and Xray crystallography. Crystallographic data are as follows: formula C88H104B2O6Sm2, FW=158021, monoclinic, space group P21/a, a=17911(4), b=21368(4), c=20894(7) nm, =10177(2), V=7828(3) nm3, Z=4, Dc=1341 gcm-3, (Mo K)=1541 cm-1, F(000)=3256, R=0040, RW=0051. Two centroids of the cyclopentadienyl groups and three oxygen atoms around a samarium atom form a distorted trigonal bipyramid.
文摘The complex [(η5-CH3C5H4)2Tb(μ-Cl) (THF)]2, has been studied by X-ray crystallography. The crystal is orthorhombic , space group Phcn with a= 20.414(2),b=9. 548(1),c=16.390(6)A.V=3194.9(6) A3, Mr=849.46,Z=4,Dc=1.77 g/cm3, F(000)=1664,μ=46.37 cm-1.The Tb3+ ion is coordinated by two CH3C5H4 groups, two chloride ions and one oxygen atom from tetrahydrofuran to form a distorted trigonal bipyramidal geometry. Two bridging Tb-Cl bond lengths are 2. 716(2) and 2.790(2)A,respectively.The Tb-O (THF) and average Tb-C(CH3C5H4) bond lengths are 2.559(6) and 2.670(4)A,respectively.
