The mono and di substituted derivatives of the parent cluster {μ3 H(Ph)C=C}FeCo2(CO)9 (1) have been synthesized by facile substitution reactions. The compound {μ3 H(Ph)C=C}FeCo2(CO)7(dppe) (2), {μ3 H(Ph)C=C}FeCo2(C...The mono and di substituted derivatives of the parent cluster {μ3 H(Ph)C=C}FeCo2(CO)9 (1) have been synthesized by facile substitution reactions. The compound {μ3 H(Ph)C=C}FeCo2(CO)7(dppe) (2), {μ3 H(Ph)C=C}FeCo2(CO)8(PPh3) (3) and {μ3 H(Ph)C=C}FeCo2(CO)8(AsPh3) (4) were characterized by elemental analysis, IR, 1H ,31P NMR, MS and X ray crystallography. The new cluster 2 crystallizes in monoclinic space group P21/n, with a=0. 8614(5)nm, b=1.6404(8)nm, c=2.6574(14)nm, β=96.3222(12)°, V=3.732(3)nm3, Z=4, S=0.886, Δρmax=0.335e·nm-3, Δρmin=-0.379e·nm-3. Final R indices : R1=0.0432, wR2=0.0695. CCDC: 164600.展开更多
A mesogen-jacketed liquid crystal polymer,poly{2,5 -bis［(4′-hexyloxyphenyl)oxycarbonyl］styrene}(PHPCS),with number-average d molecular weight of 1.28×１０5 and polydispersity of 1.48 was prepared vi a 2,2,6,6 ...A mesogen-jacketed liquid crystal polymer,poly{2,5 -bis［(4′-hexyloxyphenyl)oxycarbonyl］styrene}(PHPCS),with number-average d molecular weight of 1.28×１０5 and polydispersity of 1.48 was prepared vi a 2,2,6,6 -tetramethyl-piperidinyloxy mediated free radical polymerization.The thermotr opic behavior was studied by a combination of differential scanning calorimetry, thermogravimetry,polarized optical microscope and wide-angle X-ray diffracti on.PHPCS was not crystalline over the entire temperature region studied.On hea ting,PHPCS first became an isotropic melt at glass transition temperature (T g) and then a mesophase at temperatures much higher than T g.On subseq uent cooling,the formed ordered phase disappeared above T g.Contrary to t heoretical predictions and previous experimental observations,the transition fr om isotropic melt to liquid crystalline phase was an endothermic process and th e order-disorder transition took place with concurrence of heat release.展开更多
Hydroxy-phenyl)-5-(2-methyl-phenyl)-6-ethoxycarbonyl-cyclohexen-2-one has been synthesized and characterized by elemental analysis, IR, UV, H NMR and MS, and its crystal 1 structure was determined by X-ray single-crys...Hydroxy-phenyl)-5-(2-methyl-phenyl)-6-ethoxycarbonyl-cyclohexen-2-one has been synthesized and characterized by elemental analysis, IR, UV, H NMR and MS, and its crystal 1 structure was determined by X-ray single-crystal diffraction method. The crystal belongs to the monoclinic system, space group P21/c with a = 14.6298(13), b = 5.8623(5), c = 22.255(2) ?, β = 105.855(2)o, V = 1836.0(3) ?3, Mr = 350.40, Z = 4, Dc = 1.268 g/cm3, F(000) = 744, μ(MoKα) = 0.086 mm-1, R = 0.0680 and wR = 0.1498. The crystal analysis results show that the cyclohexene unit of the title compound has a quasi-chair conformation, and a centrosymmetric dimer with a 16-membered ring is produced by the intermolecular hydrogen bonds.展开更多
文摘The mono and di substituted derivatives of the parent cluster {μ3 H(Ph)C=C}FeCo2(CO)9 (1) have been synthesized by facile substitution reactions. The compound {μ3 H(Ph)C=C}FeCo2(CO)7(dppe) (2), {μ3 H(Ph)C=C}FeCo2(CO)8(PPh3) (3) and {μ3 H(Ph)C=C}FeCo2(CO)8(AsPh3) (4) were characterized by elemental analysis, IR, 1H ,31P NMR, MS and X ray crystallography. The new cluster 2 crystallizes in monoclinic space group P21/n, with a=0. 8614(5)nm, b=1.6404(8)nm, c=2.6574(14)nm, β=96.3222(12)°, V=3.732(3)nm3, Z=4, S=0.886, Δρmax=0.335e·nm-3, Δρmin=-0.379e·nm-3. Final R indices : R1=0.0432, wR2=0.0695. CCDC: 164600.
文摘A mesogen-jacketed liquid crystal polymer,poly{2,5 -bis［(4′-hexyloxyphenyl)oxycarbonyl］styrene}(PHPCS),with number-average d molecular weight of 1.28×１０5 and polydispersity of 1.48 was prepared vi a 2,2,6,6 -tetramethyl-piperidinyloxy mediated free radical polymerization.The thermotr opic behavior was studied by a combination of differential scanning calorimetry, thermogravimetry,polarized optical microscope and wide-angle X-ray diffracti on.PHPCS was not crystalline over the entire temperature region studied.On hea ting,PHPCS first became an isotropic melt at glass transition temperature (T g) and then a mesophase at temperatures much higher than T g.On subseq uent cooling,the formed ordered phase disappeared above T g.Contrary to t heoretical predictions and previous experimental observations,the transition fr om isotropic melt to liquid crystalline phase was an endothermic process and th e order-disorder transition took place with concurrence of heat release.
基金This work was financially supported by the Education Committee of Hunan Province (02C465)Hunan Provincial Key Discipline and Hunan Provincial General College Leader of Learning
文摘Hydroxy-phenyl)-5-(2-methyl-phenyl)-6-ethoxycarbonyl-cyclohexen-2-one has been synthesized and characterized by elemental analysis, IR, UV, H NMR and MS, and its crystal 1 structure was determined by X-ray single-crystal diffraction method. The crystal belongs to the monoclinic system, space group P21/c with a = 14.6298(13), b = 5.8623(5), c = 22.255(2) ?, β = 105.855(2)o, V = 1836.0(3) ?3, Mr = 350.40, Z = 4, Dc = 1.268 g/cm3, F(000) = 744, μ(MoKα) = 0.086 mm-1, R = 0.0680 and wR = 0.1498. The crystal analysis results show that the cyclohexene unit of the title compound has a quasi-chair conformation, and a centrosymmetric dimer with a 16-membered ring is produced by the intermolecular hydrogen bonds.
