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1.
《Inorganica chimica acta》1987,127(1):95-101
The pentadentate ligand 2,6-diacetylpyridinedisemicarbazone, DAPSC, reacts with Cr(NO3)3·9H2O and forms two kinds of complexes. At pH=3, the ligand is singly-deprotonated and crystals of [Cr- (DAPSCH)(H2O)2](NO3)2·H2O (Ia) are obtained. Evaporation of a solution at pH=0, yields crystals of [Cr(DAPSC)(H2O)2](NO3)3·2H2O (II) in which the ligand is fully protonated. The reaction of DAPSC with UO2(O2CCH3)2 in methanol, followed by crystallization of the product from DMSO yields crystals of [UO2(DAPSC2H)(H2O)]·2DMSO (III) in which the ligand is fully deprotonated. Compound Ia is monoclinic, space group P21/n with a=11.746(1), b=14.752(2), c=11.866(1) Å,β=105.53(2)°, V= 1981(1) Å3 and Z=4. Compound II is monoclinic, space group, P21/n with a=38.000(3), b= 14.939(2), c=8.233(1) Å, β=96.12(2)°, V= 4647(1) Å and Z=8. Compound III is monoclinic, space group P21/n with a=18.048(2), b=15.207(2), c=8.842(1) Å,β=97.72(2)°, V=2405(1) Å3 and Z=4. The structures were refined using 2084, 4169 and 2516 reflections to R values of 4.4%, 7.8% and 4.8% respectively.  相似文献   

2.
The structures of three Pt(II) thiourea complexes, trans-[(tu)2Pt(NH3)2]Cl2 (1), trans-[(tu)2Pt(CH3NH2)2]Cl2·3H2O (2) and [Pt(tu)4]Cl2 (3), have been determined by X-ray diffraction and refined to R = 0.049 for 1026 reflections (1), R = 0.057 for 2547 reflections (2) and R = 0.046 for 2792 reflections (3). All the compounds crystallize in the space group P21/c and have cell dimensions: a = 5.437(1), b = 6.450(1), c = 17.980(3) Å, β = 96.05(2)°, Z = 2 (compound 1); a = 9.225(1), b = 15.404(2), c = 12.601(2) Å, β = 105.39(2)°, Z = 4 (compound 2); and a = 9.051(6), b = 10.203(6), c = 18.263(8) Å, β = 91.12(8)°, Z = 4 (compound 3). The unit cell of 1 and 3 contains only a single type of cation, while that of 2 is formed from two independent cations. In 1 and 2 the coordination spheres of the Pt atoms are rather similar, with angles close to 90° and coplanarity of the metal and respective donor atoms. Instead, in 3 the four sulfur atoms, which surround the Pt, display a slight distortion (0.06 Å from the mean plane) towards tetrahedral.  相似文献   

3.
《Inorganica chimica acta》1988,147(1):99-102
K2PtCl4 reacts with L-lysine and with D,L-diaminiopropionic acid (Dap) forming the neutral complexes [PtCl2(N,O-Lys)]·H20 (1) and [PtCl2(N,O-Dap)], (2) respectively.Compound 1 is monoclinic, space group P21 with a = 11.262(3), b = 11.041(2), c = 9.690(2) Å, β = 102.07(5)°, V = 1178(1) Å3 and Z = 4. Compound 2 is monoclinic, space group P21/n with a = 8.777(1), b = 10.615(2), c = 7.947(1) Å, β = 94.98(3)°, V = 738(1) Å3 and Z = 4. In both compounds, the zwitterionic ligands form an N,O-five membered chelate with the platinum atom. Structures 1 and 2 were refined to R values of 3.3% and 6.3% respectively.  相似文献   

4.
5.
6.
Iron(III) complexes of three aroyl hydrazones, pyridoxal isonicotinoyl hydrazone (H2pih), pyridoxal benzoyl hydrazone (H2pbh), and salicylaldehyde benzoyl hydrazone (H2sbh), were synthesized and characterized. In aqueous medium at pH 7, [Fe(pih)(Hpih)]·3H2O is formed. In acidic methanol, a 1:1 ligand-to-metal complex is formed, [FeCl2(H2pih)]Cl (1), whereas in aqueous medium at low pH cis-[FeCl2(H2pih)(H2O)]Cl·H2O (2) is formed. Compounds 1 and 2 are high-spin d5 with μeff = 5.88 μB and 5.93 μB (298 K). The crystal structures of 1 and 2 show that H2pih acts as a tridentate neutral ligand in which the phenolic and hydrazidic protons have shifted to the pyridine nitrogen atoms. The co- ordination polyhedron of 1 is ‘square’ pyramidal, whereas that of 2 is pseudo-octahedral. Compound 1 is triclinic, space group Pl, with a = 12.704(2) Å, b = 8.655(2) Å, c = 8.820(2) Å, α = 105.42(1)°, β = 89.87(1)°, γ = 107.60(1)°, V = 888 Å3, and Z = 2; 2 is monoclinic, space group P21/c, with a = 15.358(4) Å, b = 7.304(3) Å, c = 17.442(4) Å, β = 101.00(2)°, V = 1921 Å3, and Z = 4.  相似文献   

7.
《Inorganica chimica acta》1987,127(2):153-159
The synthesis and characterization of trans-chloro- (ligand)bis(diphenylglyoximato)cobalt(III) complexes [ligand = pyridine (py), α-, β-, or γ-picoline (α-pic, β-pic, γ-pic), 3,5-lutidine (lut), p-toluidine (p-tol) and PPh3] is presented. X-ray crystal structure determination of the pyridine (1) and p-toluidine (6) derivatives has been carried out. Compound 1 crystallizes in the monoclinic system, space group P21/n, with Z = 4 and unit cell parameters a = 23.124(4), b = 13.009(3) and c = 11.204(3) Å, and β= 93.14(2)°. Compound 6 crystallizes in the monoclinic system, space group P21/n, with Z = 4 and unit cell parameters a = 18.792(3), b = 12.540(2) and c = 15.346(3) Å, and β = 97.54(2)°.  相似文献   

8.
A new synthesis of cis-dichlorobis(methylamine)platinum(II) is described. It appears that during the crystallization process at least two types of crystals are formed. Form A is monoclinic with space group P2 1/n and unit cell dimensions a = 6.272, b = 15.726, c = 7.419Å, β = 99.86°, V = 721Å 3, Z = 4, R = 0.055. Form B is monoclinic, with space group P2 1/c and unit cell dimensions a = 16.078, b = 6.372, c = 21.459Å, β = 92.7°, V = 2196Å 3, Z = 12, R = 0.057. The two forms can be readily distinguished by IR spectroscopy.  相似文献   

9.
《Inorganica chimica acta》1986,122(2):161-168
The preparations of Pt(theophylline)2Cl2, K[Pt- (theophylline)Cl3], K[Pt(theobromine)Cl3]·H2O (1), trans-[Pt(isocaffeine)2Cl2]·H2O (2), and K(isocaffeinium)[PtCl4]·H2O (3) are reported.Crystals of 1 are monoclinic P21/n with a=7.641- (2), b=11.873(3), c=15.868(4) Å, β=90.80(2)°, Z=4. The structure was refined on 1443 reflections to R=0.028. In the planar [Pt(theobromine)Cl3] anion Pt-N(9)=2.016(6) Å, Pt-Cl=2.299(2), 2.289(2), and 2.303(2) Å. The imidazole ring is rotated away from the coordination plane by 79.8°. Symmetry related theobromine units pack parallel to each other with a mean inter-ring separation of 3.27 Å.Crystals of 2 are monoclinic P21/a with a=7.345- (2), b=20.021(5), c=8.031(2) Å, β=104.18(2)°, Z=2. The structure was refined on 1132 reflections to R=0.029. The Pt-N(7) distance is 2.003(3) Å and Pt-Cl=2.298(1) Å. The imidazole ring is rotated away from the PtCl2N2 plane by 76.8°. In this compound, the isocaffeine units do not stack, but form a staggered arrangement within the unit cell.Crystals of 3 are monoclinic P1/c with a= 7.382- (1), b=14.014(4), c=15.757(4) », β=92.30(2)°, Z=4. The structure was refined on 2057 reflections to R=0.032. The isocaffeine is protonated at N(7). The Pt-Cl distances in the PtCl42− anion range between 2.29–2.31 Å. The protonated isocaffeine cations and the PtCl42− anions form a very nearly parallel infinitely stacked arrangement with minimum interlayer atomic separations of 3.37 and 3.44 Å.  相似文献   

10.
The preparation is reported of [(NH3)3Pt(9- MeA)] X2 (9-MeA = 9-methyladenine) with XCl (1a) and XClO4 (1b) and of trans-[(OH)2Pt(NH3)3- (9-MeA)]X2 with XCl (2a) and XClO4 (2b), and the crystal structure of 1b. [(NH3)3Pt(C6H7N5)](ClO4)2 crystallizes in space group P21/n with a = 20.810(7) Å, b = 7.697(3) Å, c = 10.567(4) Å, β = 91.57(6)°, Z = 4. The structure was refined to R = 0.054, Rw = 0.063. In all four compounds Pt coordination is through N7 of 9-MeA, as is evident from 3J coupling between H8 of the adenine ring and 195Pt. Pt(II) and Pt(IV) complexes can be differentiated on the basis of different 3J values, larger for Pt(II) than for Pt(IV) by a factor of 1.57 (av). In Me2SO-d6, hydrogen bonding occurs between Cl? and C(8)H of 9-MeA as weil as between Cl? and the NH3 groups in the case of the Pt(II) complex 1a. Protonation of the 9-MeA ligands was followed using 1H NMR spectroscopy and pKa values for the N1 protonated 9-MeA ligands were determined in D2O. They are 1.9 for 1a and 1.8 for 2a, which compares with 4.5 for the non-platinated 9-MeA. Possible consequences for hydrogen bonding with the complementary bases thymine or uracil are discussed briefly. Protonation of the OH groups in the Pt(IV) complexes has been shown not to occur above pH 1.  相似文献   

11.
The uranyl complexes [UO2(acetamidoxime)4](NO3)2 (1) and [UO2(benzamidoxime)4](NO)3)2·χS (S = nitromethane or 1,2-dichloroethane, χ < 1) (2) were prepared by the reaction of uranyl nitrate with the corresponding amidoxime in ethanolic solution, and characterized by thermal analysis and infrared spectroscopy. The crystal structures of the acetamidoxime complex and the 1,2-dichloroethane-containing benzamidoxime complex (2a) were determined by single crystal X-ray diffraction measurements and refined R1 = 0.018 and 0.070, respectively. 1 crystallizes in the monoclinic space group I2/c with a = 14.929(3), b = 8.946(2), c = 16.790(4) Å, β = 96.01(2)° and Z = 4, whereas crystals of 2a are triclinic, space group P 1 with a = 9.890(4), b = 14.226(6), c = 15.227(6) Å, α = 75.76(3), β = 87.13(3), γ = 81.22(3)° and Z = 2. In both complexes the linear uranyl group is equatorially surrounded by four oxygen atoms of monodentate amidoxime ligands, the mean bond lengths in 1 and 2a being: UOuranyl = 1.775 and 1.78 Å and UOamidoxime = 2.308 and 2.26 Å, respectively. In accordance with infrared spectroscopic results the nitrate ions are not coordinated to uranium, but interact with the ligand molecules via hydrogen bonds.  相似文献   

12.
A facile, high yield metallation procedure is reported for the insertion of Sc into H 2(TTP) (TTP= dianion of meso-tetratolylporphyrin) using anhydrous ScCl 3. Single crystal X-ray structures are reported for ClSc(TPP)·2(C 10H 7Cl) ( 1) and O[Sc(TTP)] 2·6THF ( 2). Compound 1: space group P2 1/c with a = 19.850(17), b = 28.822(24), c = 9.954(9)Å, β = 95.71(7)°, Z = 4; 2: space group P2/n, a = 16.952(9), b = 16.737(5), c = 19.93(1)Å, β = 112.56(5)°, Z = 4. Compounds 1 and 2 both had large amounts of poorly ordered solvents in the lattice which resulted in rather high R factors in the range of 12–14%. In 1, the Sc is five-coordinate (4N and 1Cl) and is centered 0.68Åabove the plane defined by the four porphyrin nitrogens. For 2, the Sc is 0.82Åfrom the plane and contains a non-linear μ-oxide bridge with a ScO Sc angle of 109(3)°, but with essentially coplanar porphyrin rings.  相似文献   

13.
The single crystal X-ray structures of (CuICH3CN4·dibenzo-18-crown-6 (I) and (CuICH3CN) (II) have been determined at room temperature [(I) C28H36Cu4I4N4o6, monoclinic space group P21/n, a = 10.116(4), b = 18.092(8), c = 22.211(9) Å, β = 98.66(3)°, Z = 4; (II) C2H3CuIN, orthorhombic pBN21, a = 13.618(8), b =8.742(2), c = 4.298(2), Z = 4]. (I) exists as a distorted cube with copper and iodine at alternate corners, the fourth coordination site copper occupied by an acetonitrile molecule coordinated through nitrogen. The cluster contains no crystallographic symmetry element and CuCu distances average 2.770(5) Å. The dibenzo-18-crown-6 displays only second sphere type interactions with cluster. (II) displays a pleated double chain type structure with distorted rectangles of alternating Cu and I atoms sharing opposite edges in infinite array. Copper displays tetrahedral geometry by coordination to three iodine atoms and a nitrogen bound acetonitrile molecule.  相似文献   

14.
The crystal structure of chloro-(1-methyltyminato- N3)-cis-diammineplatinum(II) monohydrate, cis- (NH3)2Pt(C6H7N2O2)Cl·H2O, is reported. The compound crystallizes in space group P1 with a = 6.911(2) Å, b = 8.598(3) Å, c = 11.464(4) Å, α = 100.13(3)°, β = 120.03(3)°, γ = 93.16(3)°, Z = 2. The structure was refined to R = 0.048 and Rw = 0.057. The compound contains the deprotonated 1-methylthymine ligand coordinated to Pt through N3 (1.973(10) Å). This distance represents the shortest Pt-N3(pyrimidine-2.4-dione) bond reported so far. The two PtNH3 bond lengths differ significantly: PtNH3 (trans to Cl) is longer (2.052(10) Å) than PtNH3 (trans to N3 of 1-MeT) (2.002(11) Å). The PtCl distance (2.326(3) Å) is normal, as is the large dihedral angle between the Pt coordination plane and the nucleobase (76.5°).  相似文献   

15.
16.
17.
《Inorganica chimica acta》1986,122(2):199-205
The X-ray structures of two binuclear copper(II) chloride complexes of the tetradentate ligands 1,4- bis(4,6-dimethyl-2-pyridylamino)phthalazine (PAP46Me) and 3,6-bis(2-pyridylthio)pyridazine are reported. [Cu2(PAP46Me)Cl4] (1) and [Cu2(PTP)Cl4]· CH3CH2OH (2) contain triply bridged binuclear centres involving a diazine (NN) and two chlorobridges with copper-copper separations in the fange 3.19–3.25 Å and distorted square pyramidal copper stereochemistry. The reduced room temperature magnetic moments indicate antiferromagnetically coupled binuclear copper(II) centres.Complex 1 forms green crystals with a= 15.795(3), b=10.661(3), c=16.155(4) Å, β= 113.82(3)°, C2/c, Z = 4, Rf=0.031. Complex (2) forms green crystals with a=33.9022(8), b= 9.1626(5), c= 15.7885(5) Å,β= 114.853(2)°, C2/c, Z=8, Rf=0.047. The structure of the ligand PTP is also reported and compared with that of 2.  相似文献   

18.
The preparation and molecular and crystal structure of the complex [(ethylenediamine)bis(7,9,-dimethylhypoxanthine)platinum(II)] hexafluorophosphate, [Pt(C2H8N2)(C7H8N4O)2] (PF6)2, are reported. The complex crystallizes in the monoclinic system, space group C2/c, with a = 12.334(2)Å, b = 10.256(2)Å, c = 22.339(3)Å, β = 101.31(1)°, V = 2771.0Å3, Z = 4, Dmeasd = 2.087(3) g cm?3, Dcalc = 2.094 g cm?3. Intensities for 3992 symmetry-averaged reflections were collected in the θ-2o scan mode on an automated diffractometer employing graphite-monochromatized MoKα radiation. The structure was solved by standard heavy-atom Patterson and Fourier methods. Full matrix least-squares refinement led to a final R value of 0.051. Both the ethylenediamine chelate and the PF6? anion are disordered. The primary coordination sphere about the Pt(II) center is approximately square planar with the bidentate ethylenediamine ligand and the N(1) atoms [Pt(II) ? N(1) = 2.020(5)Å] of two 7,9-dimethylhypoxanthine bases (related by a crystallographic twofold axis of symmetry) occupying the four coordination sites. The exocyclic O(6) carbonyl oxygen atoms of the two 7,9-dimethylhypoxanthine ligands participate in intracomplex hydrogen bonding with the amino groups of the ethylenediamine chelate [N(ethylenediamine) ? O(6) = 2.89( )Å]. The observed Pt ? O(6) intramolecular distances of 3.074(6)Å are similar to those found in other Pt(II) N(1)-bound 6-oxopurine complexes and in several Pt(II) N(3)-bound cytosine systems.  相似文献   

19.
The structure of the complex [Pt(trans-1,2-di- aminocyclohexane) (acetate)2]·H2O has been determined by X-ray diffraction. This racemic compound is orthorhombic, space group Aba2, a = 20.813(9), b = 7.926(5), c = 17.296(8) Å, Z = 8. The structure was refined on 1214 nonzero Cu Kα reflections to R = 0.028. The square planar environment of Pt includes the amino groups of the diamine in cis positions and oxygens from two monodentate acetates. The PtN and PtO distances average 2.00(3) and 2.02(3) Å, respectively. The bite of the diamine ligand imposes a NPtN angle of 85(1)°, whereas the small OPtO angle of 85(1)° probably results from packing effects. The average plane through the puckered cyclohexyl ring makes an angle of 19° with the PtN2O2 plane. The molecules are stacked by pairs along the b axis. The two molecules of each pair are 180° apart about the stacking axis, and form altogether four NH···O hydrogen bonds.  相似文献   

20.
The crystal structure of the complexes (I)Ni[C11N8N2(OH)2]2SO4, (II) Cu[C11H8N2(OH)2]2Cl2· 4H2O and (III) Cu[C11H8N2(OH)2]2(NO3)2·2H2O have been determined by three-dimensional X-ray analysis methods. Crystal data are: (I), monoclinic, space group C2/c, Z = 4, a = 19.666(4), b = 7.994(2), c = 16.045(6) /rA, /gb = 111.231(9)°, (II), monoclinic, space group C2/c, Z = 4, a = 14.504(4), b = 12.333(8), c = 14.630(3) Å, /gb = 90.92°; and (IIl), monoclinic, space group P21/n, Z = 2, a = 7.601(5), b = 11.977(4), c = 14.463(6) Å, β = 93.10(8)°. These structural investigations clearly demonstrate that in each case hydration occurs across the ketone double bond in the ligand and that the resulting hydroxyl group coordinates to the metal. Two di-2-pyridyl ketone ligands are thus bonded to the metal atom in a tridentate fashion. In the nickel complex (I), all six coordination interactions appear to have approximately the same strength. However, in the copper complexes (II) and (III), the pyridyl nitrogens are strongly coordinating to the metal in the equatorial plane, while the hydroxyl groups are more weakly coordinating in the axial direction. The metal to ligand bond distances are: (I) dNi−O = 2.098(4), dNiN = 2.062(4), 2.087(4) Å, (II) dCuO = 2.465(5), dCuN = 1.994(5), 2.006(5) Å, (III) dCuO = 2.464(5), dCuN = 1.990(5), 2.036(5) Å. The neutral diol that results from hydrolysis of di-2-pyridyl ketone is stabilized by coordination to the metal and such coordination is little affected by changes in the metal, the anion or the extent of hydration.  相似文献   

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