CRYSTAL AND MOLECULAR STRUCTURE OF(μ-PhCH_2S)(μ-CH_3C(0)CH_2S)Fe_2(CO)_6

<正> The crystal and molecular structures of (μ-PhCH2S)(μ-CH3C(O)CH2S)-Fe2(CO)6 have been determined by X-ray diffraction technique. The complex has chemical formula of C16H12O7S2Fe2 and Mr=492.08. The crystals are tri-clinic, space group P1,with a=8.461(5), b=10.937(5), c=ll.419(4)A,α=81.61 (3), β=78.21(4),γ=71.04(4)°,V=974.5A3, Dc=1.68 gcm-3,μ(MoKα)=17.3cm-1, Z=2,F(000)=495.93. The final R was 0.038 for 2874 independent reflections.     

CRYSTAL AND MOLECULAR STRUCTURE OF μ-ACYL Fe-S COMPLEX (μ-C_2H_5S)[μ-CO-C(CH_3 )=CH_2]Fe_2(CO)_6

<正> The crystal and molecular structure of(u-C2H5S)[μ-CO-C(CH3)-CH2]Fe2(CO)6, Mr = 409.958 has been determined by X-ray diffraction method. Crystals of this complex are monoclinic, belonging to space group P21/c, and the cell parameters are a = 9.191(1), b = 9.666(1), c = 18.47(2)A,β=98.71(1)° V= 1621.9A3,Z=4,Dc=1.68g/cm3.Thg final R and Rw equal 0.058 and 0.089 for 1948 observed unique reflections. The acyl and ethyl-thio groups are bridged to two iron atoms to form an envelope type of structure. The bond lengths of Fe(1)-0(1), Fe(2)-C(1), Fe(l)-S, Fe(2)-S, Fe(l)-Fe(2) involved in the envelope structure are 1.992, 1.980, 2.260, 2.242 and 2.552A, respectively.     

CRYSTAL AND MOLECULAR STRUCTURE OF (μ-SPh) (μ-SCH2CH2CN)Fe_2 (CO)_6

<正> The crystal and molecular structure of (μ-SPh)(μ-SCH2CH2CN)Fe2-(CO)5 has been determined by X-ray diffraction method. The crystals of this complex are triclinic, space group P1,with a=ll.175(1), b=ll.877(2), c= 15.640(2)1,α=106.20(1),β=103.15(1),γ=98.46(1)°; Z=4; Dc=1.67g/cm3. The final structure refinement converged with unweighted and weighted R factors of 0.028 and 0.034 for 2853 observed unique reflections.     

CRYSTAL AND MOLECULAR STRUCTURE OF (μ-PhS) (μ-σ,π-CH_3CH = CH)Fe_2(CO)_6

<正> The crystal and molecular structure of (μ-PhS) (μ-σ, n-CH3CH = CH)-Fe2(CO)6 has been determined by X - ray diffraction technique. The complex has chemical formula of C15H10O6SFe2 and Mr=129. 99. The crystals are monoclinic,space group P21/c,with α=11. 789(2),b= 7. 159(1),c = 20. 890(4) A ;β = 100. 89(2);V = 1731. 32 A3;Z=4,Dc=1. 65g·cm-3;F(000) = 863. 86. The final R and Rw equal 0. 0315 and 0. 0405 respectively for 2527 observed unique reflections.     

CRYSTAL AND MOLECULAR STRUCTURE OF (μ-PhS)-(μ-p-CH_3C_6H_4CCH=CH) Fe_2(CO)6

<正> The red transparent crystals of the title complex C22H14O7SFe2 (Mr=534.0996) crystallize in triclinic space group Flwith cell parameters:a = 9. 939(6),b= 10. 065(5), c= 12. 344(7) A;a=73. 95(4),B=79. 07(4),y=74. 77(4) ;V= 1135. 87A;Z=2;Dc=1.56g.cm-3;F(000) = 540. 0. The final R and Rwis 0.089 and 0. 086 for 3051 observed unique reflections. The ligand u-a,n-p-CH3C6H4C(O)CH=CH in the title complex is coordinated to two Fe atoms.     

CRYSTAL AND MOLECULAR STRUCTURE OF 2-PHBNYLQUINOXALINE

<正> C14H10N2,Mr =206.24, space group P21/n, a =5.861(3), b =10.230 (5), c =17.440(11) A,β=92.07(5)°,V= 1045(1) A3,Z=4, Dx=1.31 g.cm-3, MoKa radiation,u=0.73 cm-1,F(000)=432,R=0.063 for 1054 observed reflections. 2-Phenylquinoxaline molecule is approximately planar. The dihedral angle between the quinoxaline ring and the substituted phenyl ring is 7.0°. The C-C bond distance connecting these two rings is 1.495(4) A. The whole molecule is a conjugation system.     

SYNTHESIS AND CHARACTERIZATION OF (PPh_3)_3Co(μ-CO)_2 V(CO)_2Cp AND (PPh_3)

ＳＹＮＴＨＥＳＩＳＡＮＤＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦ（ＰＰｈ_３）_３Ｃｏ（μ－ＣＯ）_２Ｖ（ＣＯ）_２ＣｐＡＮＤ（ＰＰｈ_３）ＨＰｔ（μ－ＣＯ）（μ－ＰＰｈ_２）Ｖ（ＣＯ）_２ＣｐＣｈａｎｇＰｉｎｇＳＨＡＯ（ＤａｌｉａｎＩｎｓｔｉｔｕｔｅｏｆＣｈ?..     

CRYSTAL AND MOLECULAR STRUCTURE OF TETRAPHENYLDIARSINE

<正> The title compound, C24H20As2(Mr=458.24), crystallizes in mono-clinic with space group P21/n and a=6.268(2), b=7.494(2), c=21.340(7)A, β= 91.027(3)°, V=1002.6 A3, Z=2, D.x=1.518gcm-3. The final value of R is 0.059 for 1619 observed reflections. The four phenyls arrange in a staggered trans-conformation around the As-As' bond.     

THE CRYSTAL AND MOLECULAR STRUCTURE OF Cu_2(■-OCH_2COO)_4(DMF)_2

<正> INTRODUCTION. The complexes of some transition metals with plant growth regulators still have growth-regulating activity. For example the copper(Ⅱ) chelates of N-phenyl thalaminic acid derivatives are this type complexes. We have synthesized complex of Cu(Ⅱ) with β-naphthoxyacetic acid which has the action of stimulating plant growth. The crystal structure of Cu_2(β-C_(10)oH_7OCH_2COO)_4(DMF)_2 has been determined.     

CRYSTAL AND MOLECULAR STRUCTURE OF RABDOSERRIN-B

<正> INTRODUCTION. Four compounds of diterpenoids that have in vitro cytotoxity against cultured Hala cells have been obtained by means of extraction from Rabdosia serra(Maxim) Hara, a chinese medical herb. They are Rabdoserrin A (Rab A), Rabdoserrin B (Rab B), Excisanin A and Kamebakaurin (Kam). Among them, Rab A and Rab B are new compounds. Crystal structures of Rab A and Kam have been solved. The chemical structure of Rab B has been     

CRYSTAL STRUCTURE OF CsHsFeC_5H_4CH_2N(CH_3)_2BH_3

<正> INTRODUCTION. We have studied the structures of some compounds which contain the cyclependadienyl-aromatic sandwich complexes of metal and boronhydride. The present work is a continuation of our previous work.     

CRYSTAL AND MOLECULAR STRUCTURE OF STEMOTININE

<正> C18H25NO5, Mr = 335.40, tetragonal, P41212, a = 15.578(4), c =14.723(3) A, V =3573(2) A3, Z = 8, D = 1.247 g cm-3, MoKα,λ= 0.71069 A, μ = 0.;85 cm-1, T = 293K, final R .= 0.100 and RW (on F2) = 0.080 for 1095 observed data [|FO| > 2σ(|FO|)]. The structure confirms the spectrbscopic assignment of a pentacyclic skeleton containing two α-methyl-γ-lactone rings, one ether and one tertiary amine.     

CRYSTAL AND MOLECULAR STRUCTURE OF {Fe_6Mo_2S_8(S-t-Bu)_6(OMe)_3}(Et_4N)_3

<正> Introduction. The title compound has been synthesized by reaction of {(SR)_2FeMoS_4}2-with {Fe_4(SR) 10}~2- (R=t-Bu) in methanol. It is interesting to note that the complex, which involves two {Fe_3MoS_4}cubane-like clusters, is generally regarded as the best model compound for molybdenum center of nitrogenase. The synthesis and property of {Fe_6Mo_2S_8(S-tBu)_6(OMe)_3}~3- have been discribed. Although it has previously been noted that the structure of this complex is similar to its tungsten analog, the detail structural report of the title compound has not yet been given.     

CRYSTAL AND MOLECULAR STRUCTURE OF MOLYBDENUM COM-PLEX MoO_2Cl_2(C_4H_3OCOOH)_2

<正> The crystal and molecular structure of the title compound was determined by single crystal X-ray diffraction method. The complex crystallizes in the mono-clinic space group P21/n with a = 10. 306 ( 3) , b = 10. 161 (2), c = 14. 798 ( 4) A . β= 108. 52(2)°, V= 1469. 4(6)A3,Z= 4. The structure was solved by direct methods. Least-squares refinement converged to a final value of R = 0. 043 and Rw= 0. 040 for 1237 reflections. The molybdenum (Ⅵ) ion is bonded to two chlorine atoms, two oxo atoms and two oxygen atoms from two monodentately and weakly coordinated carboxyl groups of molecules C4H3OCOOH, forming a octahedron. The Mo-O distances are in the range 1. 66 - 2. 39A ,the Mo-Cl distances fall in the range 2. 33-2. 34A.     

CRYSTAL AND MOLECULAR STRUCTURE OF RABDOSERRIN-D

<正> Introduction. Rabdoserrin-D C_(20)H_(30)O_5 is extracted from Rabdosia serra (Maxim) Hara, a Chinese medical herb with antitumourous activities. Tests show that this compound has a high inhibitory effect on the Hela cell cultured outside the body and thus it is worth further studying, The investigation on the     

CRYSTAL AND MOLECULAR STRUCTURE OF TETRANUCLEAR MOLYBDENUM CLUSTER Mo_4(μ_3-O)_2Cl_2(o-CH_3C_6H_4COO)_6

<正> Cluster compound [Mo4(μ3-O)2O4Cl2(o-CH3C6H4COO)6] has been prepared by the reaction of molybdenum pentachloride and o-methylbenzoic acid. It crystllizes in the orthorhombic space group Praia with cell parameters:Mr= 1361. 6,a=13. 792(4), b=17. 957(3),c= 20. 974(9) A ,V=5194(2) A3,Z= 4,Dc= 1. 74g/cm3,F(000) = 2704,μ(MoKa) = 11. 0/cm. The final R=0. 061 and Rw=0. 064 for 1441(I>3oooooooooo(I)) observed unique reflections. The tetranuclear complex molecule, where the molybdenum atoms are bridged by two μ3-O atoms and six bidentate o-methylbenzoato ligands,is located at crystallographic two-fold axis(x,-1/4,1/4) with one Mo-Mo bond of 2. 610A     

SYNTHESIS AND CRYSTAL STRUCTURE OF MgCl_2(CH_3COOC_2H_5)_2

The crystal of the title compound was prepared and its structure determined by X-ray diffraction method.1672 independent reflections were collected. The crystal is orthogonal with space group P2_12_12, and a=7.353(3),b=25.111(10), c=8.631(2), Z=8. The structure was solved by using Patterson method and modified with LSM program.The final R= 0.0795. The structural features of the title compound are:Mg(Ⅱ) is octahedral and ethyl acetate is located on trans-position.Mg atoms are connected by double chloro-bridge and form polychains.     

CRYSTAL AND MOLECULAR STRUCTURE OF β-(Et_4N)_3 [Fe_3(SPh)_3Br_3C1_3]

<正> Introduction. Previously, we have reported the compound α-(Et_4N)_3[Fe_3(SPh)_3-Br_3Cl_3](Ⅰ)~1 with C_2 symmetry. An isomer(Ⅱ) of this compound, which has D_3dsymmetry, is reported in this paper. Brow-green crystals of Ⅱ is obtained from the reaction of FeCl_2, PhSNa and Et_4NBr (1:1:1) in acetonitrile solution.     

CRYSTAL AND MOLECULAR STRUCTURE OF BENZO-13-CROWN-4

<正> To elucidate structural relations between benzo-13-crown-4 and its similar crown compound. We determined the crystal structure of the title compound, which is a pure crown. The results of our investigation show that the dihedral angle between the planes of benzo-ring and of the O-atoms in the crown ring is 43.5°. The related distances between O atoms in benzo-13-crown-4 are 2.651 to 4.906, respectively.