4,4′-联苯二膦及其相关化合物合成

E·M·Evleth等曾用正丁基锂合成对位-苯基二膦H_2PC_6H_4PH_2及其相关化合物。但制备手续较烦,产率不高。P·G·Chanfrell等从格氏试剂出发,合成了P,P,P′,P′-四(二乙胺基)-1,4-苯基二膦[(C_2H_5)_2N]_2PC_6H_4P[N(C_2H_5)_2]_2。本文报导改进和简化了的E.M.Evleth法反应,第一次合成三个对位-联苯基二膦及其衍生物,即4,4′-     

四核钴羰基簇合物CO_4(CO)_8(μ-CO)_2(μ_4-PSR)_2的合成和晶体结构

通过Co_2（CO）_8与二气烧流基酸RSPCI_2［R＝－CH_3－C_2H_5，－C（CH_3）_3，－（CH_2）_4H_3］反应，得到4个新簇合物．除用元素分析、IR、~1HNMR和MS表征其结构外，还用X光衍射法测定了侯会物CO_4（CO）_8（μ-CO）_2（μ_4－PSR）_2小的单品结构该簇合物用单斜晶系，P21／C空间群．晶胞参数为α＝8．445（3），b＝8．562（3），c＝17．125（6），β＝104．26（3）°；V＝1200．1A3；Dc＝1．9379cm~3μ＝3．058mm~(－1)；F（000）＝688．结构分析表明，四个Co原子形成平面矩形，两个PSR四重桥基分别在四钻平面上下盖帽构成Co_4P_2类人面体骨架，骨架为D_(2h)点群对称性．PSR配体为4e供体，与四个钴原子成键．     

配合物Co〔S_2P(O-i-C_3H_7)_2〕_3的合成和晶体结构

过渡金属硫配合物可作为加氢脱硫 (ＨＤＳ)和加氢脱氮 (ＨＤＮ)过程的有效催化剂而倍受人们关注[1 - 3] 。这类配合物的催化活性、选择性和抗毒性与过渡金属的种类、配合物本身的立体结构和电子分布密切相关[4- 5] 。其中 ,钴的硫化物在ＨＤＳ和ＨＤＮ过程中有很好的催化活性。本文由二元金属羰合物Ｃｏ2 (ＣＯ) 8和双 (硫代磷酸二异丙基酯 )二硫化物 (Ａ) ,合成标题配合物Ｃｏ〔Ｓ2 Ｐ(Ｏ -ｉ-Ｃ3Ｈ7) 2 〕3(Ｂ) ,对配合物Ｂ进行ＸＲＤ表征 ,并对反应机理进行初步探讨。反应式如下 :1　实验部分1 1　试剂与仪器苯和石油醚 (ｍ .ｐ .60～ 9…     

具强迫项高阶非线性中立型差分方程的振动性与渐近性

讨论具强迫项高阶非线性中立型差分方程△m(xn ∑si=1pi(n)xγi(n)) ∑kj=1qj(n)hj(xσj(n))=fn,n=0,1,2,…及其相关联的差分方程△m(xn ∑si=1pi(n)xγi(n)) ∑kj=1qj(n)hj(xσj(n))=0,n=0,1,2,…的振动性与渐近性,得到了所有解振动或趋于零的充分性判据.     

Fe_3(CO)_9(μ_3-S)_2的P(SR)_3取代物的结构化学研究——Ⅰ.Fe_3(CO)_8[P(SC_6H_5)_3](μ_3-S)_2的合成和晶体结构

用P(SR)_3作π-酸配体,与Fe_3(CO)_9(μ_3-S)_2进行取代反应,得到新的取代物Fe_3(CO)_8-[P(SC_6H_5)_3](μ_3-S)_2,对它进行了IR、~1HNMR、MS表征,并测定了它的分子和晶体结构,对取代基P(SPh)_3取代Fe_3(CO)_9(μ_3-S)_2中羰基的位置作了讨论.     

Fe3(CO)8[P[SC6H5)Cl2](μ3-S)2的合成和晶体结构

The title compound Fe_3(CO)_8 (P(SC_6H_5) Cl_2) (μ_3′-S)_2 was synthesised by reacting Fe_3(CO)_9 (μ_3-S)_2 with P (SC_6H_5) Cl_2. The crystal and molecular structure of the title compound has been determined by single crystal diffraction method. Crystal data: triclinic, space group P1, with a=0.7571(1), b=0.9097(1), c=1.7706(2) nm, α=95.03(1), β=101.79(1), γ=105.73(1)°, V =1.1359 nm, Z=2, Dc=1.935 g·cm~(-3). The structure was solved by direct method and difference Fourier synthesis, and refined by full-matrix least-squares with anisotropic thermal paramaters for non-hydrogen atoms, using 3724 observed reflections withI≥3σ(I). The final residual factor R=0.025, R_W=0.028.Fe_(CO)_8(P(SC_6H_5)Cl_2)(μ_3-s)_2 has a face-bridged 4e donors and the monosubstituted ligand is on the apical Fe atom.     

Image encryption using high-dimension chaotic system

In recent years, the chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. This paper proposes a new approach for image encryption based on a high-dimensional chaotic map. The new scheme employs the Cat map to shuffle the positions, then to confuse the relationship between the cipher-image and the plain-image using the high-dimensional Lorenz chaotic map preprocessed. The results of experimental, statistical analysis and key space analysis show that the proposed image encryption scheme provides an efficient and secure way for real-time image encryption and transmission.     

Modified projective synchronization with complex scaling factors of uncertain real chaos and complex chaos

To increase the variety and security of communication, we present the definitions of modified projective synchronization with complex scaling factors （CMPS） of real chaotic systems and complex chaotic systems, where complex scaling factors establish a link between real chaos and complex chaos. Considering all situations of unknown parameters and pseudo-gradient condition, we design adaptive CMPS schemes based on the speed-gradient method for the real drive chaotic system and complex response chaotic system and for the complex drive chaotic system and the real response chaotic system, respectively. The convergence factors and dynamical control strength are added to regulate the convergence speed and increase robustness. Numerical simulations verify the feasibility and effectiveness of the presented schemes.     

钴原子簇化合物研究(Ⅳ)——含桥基杂环硫代酰胺基和杂环卡宾的三核钴羰基硫簇合物的合成及表征

用Co₂(CO)₃和杂环硫代酰胺SCXCH₂CH₂NH(X=NH,S,O)反应,得到两类6个新的可能具有手征性的三核钴羰基硫簇合物Co₃(CO)₇(μ₃-S)(μ-SCXCH₂CH₂N)(Ⅰ)和Co₃(CO))₆(μ₃-S)(:CXCH₂CH₂NH)(μ-SCXCH₂N)(Ⅱ).Ⅰ和Ⅱ的分子骨架Co₃S为四面体结构,其中SCXCH₂CH₂NH是通过S、N与2个Co键合的3e桥基配体,而:CXCH₂CH₂NH为2e杂环卡宾配体,对6个簇合物进行了表征,并对反应条件做了初步研究。     

Fe3(CO)~9(μ~3-S)~2的P(SR)~3取代物的结构化学研究I. Fe3(CO)8[P(SC6H5)~3](μ~3-S)的合成和晶体结构

用P(SR)~3作π-酸配体, 与Fe3(co)9(μ~3-S)~2进行取代反应, 得到新的取代物Fe3(CO)~8-[P(SC6H5)~3](μ~3-S)~2, 对它进行了IR、^1HNMR、MS表征, 并测定了它的分子和晶体结构, 对取代基P(SPh)~3取代Fe3(co)9(μ~3-s)~2中羰基的位置作了讨论。