CRYSTAL STRUCTURE OF 6-ETHOXY-5,6-QIHYDROCHELERYTHRINE

<正> C23H23O5N Mr = 393.44, triclinic,space group P 1, a =7.659(3), b= 10.183(10), c=13.396(2)A,α=92.21(7),β=100.86(2),γ=108.16(7)°,Z=2.The structure was solved by direct methods and refined to a final R factor of 0.055, Rw=0.050). The title compound belongs to the alkaloid of benzoheterophenanthrene, the molecule possesses two conjugation planes which are proped up by N(5)-C(6) bond and the dihedral angle is 12.74(24)°.     

THE STRUCTURE OF BENZO-19-CROWN-6

<正> C17O6H26,monoclinic, space group P21, a = 8.710(2), b = 17.770(3), c = 11.250(2) A, β= 99.16(2)°, V = 1719.0A3, Z = 4, Dc = 1.26 g/cm3, μ(MoKα) = 1.0 cm-1, F(000) = 704. Crystal structure was solved by SHELXTL direct method and refined by least squares technique for 1623 independent reflections of I≥2.5(?)(Ⅰ) from Nicolet P3/R3 diffractometer. The results show that the crystal consists of two nonequivalent crown ether rings A and B, in which the related distances between O atoms are 2.68-6.14 A for A and 2.52-6.06 A for B respectively.     

STRUCTURE OF POTANINE

ＳＴＲＵＣＴＵＲＥＯＦＰＯＴＡＮＩＮＥＨａｔＹａｎＰＵ；ＦｅｎｇＰｅｎｇＷＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｒＣｈｅｍｉｓｔｒｙｏｒＭｅｄｉｃｉｎａｌＮａｔｕｒａｌＰｒｏｄｕｃｔｓ，ＳｃｈｏｏｌｏｆＰｈａｒｍａｃｙ，ＷｅｓｔＣｈｉｎａＵｎｉｖｅｒｓｉｔｙ...     

STRUCTURE OF OMEIENINE

ＳＴＲＵＣＴＵＲＥＯＦＯＭＥＩＥＮＩＮＥＱｉｎｇＹａｎＸＵａｎｄＦｅｎｇＰｅｎｇＷＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙｏｆＭｅｄｉｃｉｎａｌＮａｔｕｒａｌＰｒｏｄｕｃｔｓ，ＳｃｈｏｏｌｏｆＰｈａｎｎａｃｙ，ＷｅｓｔＣｈｉｎａＵｎｉｖｅｒ...     

STRUCTURE OF HEMSLEYADINE

ＳＴＲＵＣＴＵＲＥ　ＯＦ　ＨＥＭＳＬＥＹＡＤＩＮＥＳＴＲＵＣＴＵＲＥＯＦＨＥＭＳＬＥＹＡＤＩＮＥ￥ＱｉｎｇＹａｎＸＵ；ＤｏｎｇＬｉｎＣＨＥＮａｎｄＦｅｎｇＰｅｎｇＷＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙｏｆＭｅｄｉｃｉｎａｌＮａｔｕｒａｌ...     

STRUCTURE OF PLASMA-POLYMERIZED OCTAFLUOROCYCLOBUTANE

Plasma-polymerization of octafluorocyclobutane was carried out in a capacitively coupled tubu-lar reactor with external electrodes. The number-average molecular weight, melting temperature,decomposition temperature and solubility in te trafluorodibromoethane of the products was mea-sured and the polymer structure was characterized by ESR. IR and ~(1)9F-NMR methods. The experi-mental results show the absence of the highly crosslinked structure but a fluorine-deficient structurecaused by free-radicals, carbonyl groups. double bonds and multicage-like segments in the polymer.     

THE STRUCTURE OF TRIPTOPHENOLIDE

ＴＨＥ　ＳＴＲＵＣＴＵＲＥ　ＯＦ　ＴＲＩＰＴＯＰＨＥＮＯＬＩＤＥ￥ＳｈｉＳｈａｎＹＵ；ＤｏｎｇＭｉｎｇＺＨＡＮＧ；ＤｅＱｕａｎＹＵ；ＸｉａｏＴｉａｎＬＩＡＮＧ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｅｒｉａＭｅｄｉｃａ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＭｅｄｉ...     

STRUCTURE OF 1-EPICRASSICAUDINE

ＳＴＲＵＣＴＵＲＥＯＦ１－ＥＰＩＣＲＡＳＳＩＣＡＵＤＩＮＥ￥ＦｅｎｇＰｅｎｇＷＡＮＧ；ＸｕｅＰｉｎｇＤＡＩ；ＪｉａｎＺｈｏｎｇＷＡＮＧａｎｄＲｏｎｇＺＨＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙｏｆＭｅｄｉｃｉｎａｌＮａｔｕｒａｌＰｒｏｄｕｃ...     

THE REFINEMENT OF CRYSTAL STRUCTURE OF BALIPHOLITE

Balipholite is a new mineral discovered in China. Its space group is C cca with the lattice parameters a=13.587(6), b=20.164(10), c=5.144(1). The structure was refined to an R value of 0.047 for 949 independent reflections with (|F_0|>3σ|F_0|). Balipholite has the simailar structure as that of the carpholite group but with large cations Ba occupying the caves of the structure. It is very interesting to point out that the additional anions F and OH occupy different crystallographic positions. Formula of balipolite can he written a BaMg_2LiAl_3(Si_2O_6)_2(OH)_4F_4.     

CRYSTAL STRUCTURE OF PHENYL-t-BUTYL NITRONE

<正> INTRODUCTION. It is well known that phenyl-t-butyl nitrene has been used as a scavenger to trap short-lived radicals and transfer them into more persisted paramagnetic species, thus one may use ESR technique to study their structures. Up to now, the crystal structure of phenyl-t-butyl nitrone has not been investigated yet. In this paper we report its crystal structure and this is a part of the project of study on active intermediates.     

CRYSTAL STRUCTURE OF MALONOHYDROXAMIC ACID

<正> INTRODUCTION. One major class of naturally occuring iron complexing agents are the dihydroxamic acids which help to carry iron through metabolic channels and insert it into porphyrins and other iron-containing enzymes and proteins. In our laboratory, malonohydroxamic acid was prepared and subjected to X-ray structural determination.     

THE CHEMICAL STRUCTURE OF HYPODEMAPYRAZIN

A novel alkaloid named Hypodemapyrazine was isolated from the whole plantof a fern,Hypodematium sinense Iwatsuki. Its chemical structure has been elucidated to be a novel skeleton containing ahydro-pyrazine by means of UV, IR, ~1H-NMR, ~(13)C-NMR and HRMS spectroscopy.     

CRYSTAL STRUCTURE OF NICOTINOHYDROXAMIC ACID

<正> INTRODUCTION. Hydroxamic acids function variously as growth factors, antibiotic antagonists, tumour inhibitors and cell division factors. Despite their widespread analytical applications and biological activity, few reports of detailed structures are found. We now report the crystal structure of nicotinohydroxamic acid as a part of a series of investigations on monohydrcxamic acids.     

THE CRYSTAL STRUCTURE OF NEOTRIPTOPHENOLIDE

<正> M=342.44, monoclinic, P21, a=8.100(2), b=20.493(2), c=10.830(2) A, β=90.78(2)°,V=1797.5 A3, Dc=1.265 g.cm-3, Z=4. There are two molecules per asymmetric unit. Final R = 0.036 for 1936 observed reflections. The rings A and B take semi-chair conformations and trans-fusion in the title molecule. The 5-H is α-axial and 20-CH3 is β-axial.     

THE CRYSTAL STRUCTURE OF YIMENGITE

Yimengite is a new species of mineral discovered in Shandong Province in 1980, with crystal chemical formula K(Cr, Ti, Fe, Mg, Al, Si)_(12)O_(19). It belongs to hexagonal system, and its cell parameters α_0=5.857 and c_0=22.940. 749 separate diffraction intensities of crystal were collected on RASA=IIS auto-four-circle single crystal diffractometer.All atomic coordination, temperature factor and degree of occupation were obtained by RASA-SAP interpretation system, and XTL crystallographic procedure, atomic distances and bond angles for each atom were calculated. Deviation factor R is 0.080.Through the medium of determination of the crystal structure of the new mineral yimengite, coordination form of monovaleace alkali metal element—potassium, etc. in high pressure have been cleared, a five fold coordination form of Fe cations—regular bipyramid has been established, and some new information on the geochemical state of some elements, such as Cr, Ti, etc. have been provided.     

THE CRYSTAL STRUCTURE OF BAYLEYITE

The bayleyite crystallizes in monoclinic space group C_2~5h-P2_1/c with a=6.499(1), b=15.235(5), c=26.513(6), β= 92.92(2)°, Z=4. Intensities of 3430 independent reflections are collected with diffractometer using MoKα radiation. The crystal structure has been solved by the Patterson method and refined by block least square refinement for positional parameters and isotropic temperature factor of non-hydrogen atoms. The final R factor is 0.038.The result of crystal structure analysis shows that the structure consists of discrete [UO_2(CO_3)_3]~(4-) ions and Mg~(2 ) cations are between slab-like units, but they are not in a slablike unit. Its crystal struture is different from that of liebigite which was determined by Appleman. Complexes and cations between slab-like units and in a slab-like unit are connected by hydrogen bonds formed by water molecules.     

CRYSTAL STRUCTURE OF AMMONIUM 18-CROWN-6 DITHIOCYANATO-TETRACHLORO-DIPALLADIUM(Ⅱ)

<正> INTRODUCTION. Crown compounds have formed a rapidly expanding field of chemistry and found application in many areas. Authors have studied the coordination chemistry of a series of crown compounds, such as 18-C-6, DB-18-C-6, DB-30-C-10, 15-C-5 and B-15-C-5 in thiocyanate systems with M and M' cations (M=Na~+, K~+, NH_4~+, Ca~(2+), Sr~(2+), Ba~(2+); M=Ni~(2+), Co~(2+), Zn~(2+), Ag~+, Mg~(2+)[1,2] This paper reports the IR characteristic and crystal structure of the complex of 18-C-6 with ammonium thiocyanate and palladium chloride.     

DETERMINATION OF CRYSTAL STRUCTURE OF C6H5GdCl2（THF）4

<正> By X-ray (λ=0. 71069A) diffraction of single crystal,we have determined the crystal structure of C6H5GdCl2 (THF)4,C22H37Cl2O4Gd, MT=593. 2,or-thorhombic space group Ccm2;with lattice parameters a=12. 776(6),b=12. 954(6), c=15. 802(3)A ;V=2615. 4(1. 8)A3;Z=4,Dc=2. 43gcm-3,μ=29. 3cm-1,F(000) = 1120. The structure was solved by heavy-atom method and Fourier techniques and refined by least-squares to a final R=0. 051 ,Rw = 0. 049 for 839 reflections with I≥1. 5σ (I). The results revealed that the bond length of Gd-C is 2. 437(22) A ,the average bond lengths of Gd-Cl 2. 678(6) A ,Gd-O 2. 499(12) A, C-C from phenyl group 1. 376(40)A. This crystal structure is the first organolanthanide complex with only one Ln-C bond in the molecule.     

THE STRUCTURE OF N-METHYL-CINNOLINE TCNQ_2 II.THE STRUCTURE OF IN-METHYL-CINNOLINE TCNQ_2

<正> M =553.6, triclinic,Pl, a=6.5157(22), b=7.7153(14), c=13.9146(28)A; α=88.394(16)°, β=84.288(22)°, γ=78.749(22)°, V=682.62(30)A3, Z=1; μ(MoKα)= 0.80cm-1, F(000)=284.92, room temperature. The final R=0.0537 for 1230 independent reflections. Planar tetracyanoquinodimethane(TCNQ). stacks along a axis with the molecular planes parallel to each other. The separations between TCNQs are 3.2698 and 3.2448. The overlaps of TCNQs are of the ring-external bond type. This mode of TCNQ stacking is used to explain the conductivity of the title compound. The D.C. conductivity along needle axis is σ(RT)=10(Ωcm)-1 1.