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1.
An efficient synthesis of Ph 2P-C≡C-C≡C-Li, 1, was found, starting from commercially available ( Z)-1-methoxybut-1-ene-3-yne and its diphenylphosphino derivative 2. The lithio compound 1 was condensed with electrophiles to give Ph 2P-C≡C-C≡C—Σ (Σ = SiR 3, SnR 3, B(N iPr) 2) 3. Compound 2 was easily transformed into the phosphonium salt 6 and the phosphine oxide 7 using MeI and H 2O 2 respectively. Derivatives 3 (Σ = SiMe 3, SnMe 3) are reactive at phosphorus and at the Σ group; complexation with W(CO) 5THF gave the expected derivatives W(CO) 5Ph 2P-C≡C-C≡C—Σ (Σ = SiMe 3, SnMe 3), 10, and in the case of Σ = SnMe 3, coupling reaction between Ph 2P-C≡-C-C≡C-SnMe 3, 3c, and ( η5-IC 5H 4)Mn(CO) 3 in the presence of PdCl 2(CH 3CN) 2 as a catalyst gave the complex 11, Ph 2P-C≡C-C≡C-( η5-C 5H 4)Mn(CO) 3. 相似文献
2.
The gallium(I)tris(trimethylsilyl)silyl compound {GaSi(SiMe 3) 3} 4 (1) is obtained by reaction of Ga 2Cl 4-2dioxane with LiSi(SiMe 3) 3-3THF. The crystal structure of 1 reveals a tetramer with a nearly regular tetrahedral framework of gallium atoms. The gallium-gallium distances average 258.4 pm. Ab initio calculations on various substituted gallium tetrahedrons showed a greater stability of silyl-substituted cages compared with organyl substituted ones. Crystal data, with Mo K radiation are as follows: {GaSi(SiMe 3) 3} 4 · Si(SiMe 3) 4 (1), a, B = 1923.3(3) pm, C = 2671.2(4) pm, V = 9.881(3) nm 3; tetragonal space group P4/ ncc; Z = 4; 1513 ( I > 2σ( I)) data; RI = 0.068. ZusammenfassungDas Gallium(I)tris(trimethylsilyl)silyl-Derivat {GaSi(SiMe3)3}4 (1) wird durch Umsetzung von Ga2Cl4-2Dioxan mit LiSi(SiMe3)3-3THF erhalten. Die Analyse der Kristallstruktur zeigt ein Tetramer mit einem nahezu regulären Gallium-Tetraeder-Gerüst. Der Mittelwert der Gallium-Gallium-Abstände betrügt 258.4 pm. Ab initio-Berechnungen verschiedener Gallium(I)-Verbindungen belegten eine erhöhte Stabilität von silyl-substituierten Clustern im Vergleich zu organyl-substituierten. Kristalldaten, mit Mo K -Strahlung; {GaSi(SiMe3)3 }4 · Si(SiMe3)4 (1), a, B = 1923.3(3) pm, C = 2671.2(4) pm, V = 9.881(3) nm3; tetragonal, Raumgruppe P4/ncc; Z = 4; 1513 (I > 2 σ(I)) Daten; RI = 0.068. 相似文献
3.
The title compound, 9,10-dihydro-9,10-etheno-1,8-dichloro-11-diphenylphosphinyl-12-(diphenylphosphinylethynyl)anthracene (1), has been synthesized and its crystal structure has been determined. The compound 1 crystallized into the triclinic space group P-1 with
=74.837(4)°, β=88.156(4)°, γ=65.398(4)°,
Z=2, Dc=1.352 gcm −3. In the crystal structure of 1a, one chloroform molecule was included by the compound 1 with a 1:1 ratio and the existence of non-classical intermolecular C–HO hydrogen bonds, intramolecular C–HCl and C–HO hydrogen bonds and π–π stacking were observed. 相似文献
4.
The molecular structures of n-hexane were determined by RHF/4-21G ab initio geometry optimization at 30° grid points in its three-dimensional τ1(C11–C8–C5–C1), τ2(C14–C11–C8–C5), τ3(C17–C14–C11–C8) conformational space. Of the resulting 12×12×12=1728 grid structures, 468 are symmetrically non-equivalent and were optimized constraining the torsions τ1, τ2, and τ3 to the respective grid points, while all other structural parameters were relaxed without any constraints. From the results, complete parameter surfaces were constructed using natural cubic spline functions, which make it possible to calculate parameter gradients, | P|=[(∂ P/∂τ i) 2+(∂ P/∂τ j) 2] 1/2, where P is a C–C bond length or C–C–C angle. The parameter gradients provide an effective measure of the torsional sensitivity of the system and indicate that dynamic activities in one part of the molecule can significantly affect the density of states, and thus the contributions to vibrational entropy, in another part. This opens the possibility of dynamic entropic conformational steering in complex molecules; i.e. the generation of free energy contributions from dynamic effects of one part of a molecule on another. When the conformational trends in the calculated C–C bond lengths and C–C–C angles are compared with average parameters taken from some 900 crystallographic structures containing n-hexyl fragments or longer C–C bond sequences, some correlation between calculated and experimental trends in angles is found, in contrast to the bond lengths for which the two sets of data are in complete disagreement. The results confirm experiences often made in crystallography. That is, effects of temperature, crystal structure and packing, and molecular volume effects are manifested more clearly in bond lengths than bond angles which depend mainly on intramolecular properties. Frequency analyses of the τ1, τ2 and τ3 torsional angles in the crystal structures show conformational steering in the sense that, if τ1 is trans peri-planar (170°≤τ 1≤180°; −180°≤τ 1≤−170°), the values of τ2 and τ3 are clustered closely around the ideal gauche (±60°) and trans (±180°) positions. In contrast, when τ1 is in the region (50°≤τ 1≤70°), there is a definite increase in the populations of τ2 and τ3 at −90 and −150°. 相似文献
5.
Carnosine (β-alanyl-L-histidine) is a biologically active molecule involved in muscular metabolism. It crystallises in the C; space group with a = 24.725 Å b = 5,427 Å c = 8,004 Å β = 100,2° ( Z = 4) In the crystal, acid and basic groups are engaged in hydrogen bonds whose strength is evaluated through IR frequencies. Molecular conformation in the solid state is defined by τ1 = /t-177° τ2 = −38° φ = −96° ψ = +131° χ1 = 181° χ21 = 62° NMR study of carnosine in aqueous solution indicates that rotation about CH2-CH2 is free and that the other angles take the following values: Ø −150° or −90° and X1 = 165° or 315°. Infrared and Raman spectra suggest that τ2 undergoes small changes when going from crystal to solution while ψ is close to +150°. 相似文献
6.
The theoretical studies of the gas-phase elimination of 2-substituted ethyl N, N-dimethylcarbamates (Z=CH 2Cl, C≡CH, C≡N) were performed using ab initio MP2/6-31G and MP2/6-31G(d) levels of theory. The gas phase elimination reaction of these carbamates yields N, N-dimethylcarbamic acid and the corresponding substituted olefin in a rate-determining step. The intermediate N, N-dimethylcarbamic acid is unstable and rapidly decomposes through a four-membered cyclic transition state to dimethylamine and CO 2 gas. The results of these calculations suggest a mechanism to be concerted, asynchronous, and a six-membered cyclic transition state structure. Plotting the relative theoretical rate coefficients against Taft's σ* values gave an approximate straight line ( ρ*=0.4057, r=0.9894 at 360 °C). The correlation between experimental log k rel vs. theoretical log k rel. for these 2-substituted ethyl N, N-dimethylcarbamates gave an approximate straight line ( r=0.9715 at 360 °C), suggesting the same type of mechanism. 相似文献
7.
UV irradiation of tricarbonyl-η 5-2,4-dimethyl-2,4-pentadien-1-yl-manganese (2) in THF at 208 K yields solvent-stabilized dicarbonyl-η 5-2,4-dimethyl-2,4-pentadien-1-yl-tetrahydrofurane-manganese (3), which reacts in situ with two equivalents of 1-dimethylamino-2-propyne (4) to dicarbonyl-1–5-η-2,4-dimethyl-(6-dimethylaminomethyl- N)-10-dimethylamino-deca-2,4,6,8- tetraen-1-yl-manganese (5). The crystal and molecular structure was determined by an X-ray diffraction analysis. Complex 5 crystallizes in the monoclinic space group P2 1/ c, A = 1109.9(2) pm, B = 836.0(2) pm, C = 2156.9(4) pm, β = 93.23(3)°, V = 1.9982(7) nm 3, Z = 4. Complex 5 was also studied in solution by IR and NMR spectroscopy. A possible formation mechanism of 5 will be discussed. ZusammenfassungUV-Bestrahlung von Tricarbonyl-η5-2,4-dimethyl-2,4-pentadien-1-yl-mangan (2) in THF bei 208 K liefert solvenstabilisiertes Dicarbonyl-η5-2,4-dimethyl-2, 4-pentadien-1-yl-tetrahydrofuran-mangan (3), welches in situ mit zwei Äquivalenten 1-Dimethylamino-2-propin (4) zu Dicarbonyl-1–5-η-2,4-dimethyl-(6-dimethylaminomethyl-N)-10-dimethylamino-deca-2,4,6,8-tetraen-1-yl-mangan (5) reagiert. Seine Kristall- und Molekülstruktur wurde durch eine Röntgenbeugungsanalye bestimmt. Komplex 5 kristallisiert in der monoclinen Raumgruppe P21/c, A = 1109.9(2) pm, B = 836.0(2) pm, C = 2156.9(4) pm, β = 93.23(3)°, V = 1.9982(7)_ nm3, Z = 4. Komplex 5 wurde auch in Lösung IR- und NMR-spektroskopisch untersucht. Ein möglicher Bildungsmechanismus von 5 wird diskutiert. 相似文献
8.
Reductive dehalogenation of the (chloro)(phenylethynyl)phosphine (2,4,6- tBu 3C 6H 2O)(PhCC)PCl, I, by Co 2(CO) 8, II, yields the neutral phosphenium ion complex [(R)(R′)]P=Co(CO) 3, III, (R = 2,4,6- tBu 3C 6H 2O; R′ = (η 2-C≡CPh)Co 2(CO) 6), which contains a trigonally planar coordinated phosphorus atom. When NaCo(CO) 4, V, is used instead of II a dinuclear complex, Co 2(CO) 6[μ 2-P(R)(R′)] 2, VI, (R = 2,4,6- tBu 3C 6H 2O; R′ = C≡CPh) is formed in which the phosphido ligands P(R)(R′), bridge in a μ 2 fashion two Co(CO) 3 units. The mechanism of formation of VI, involving a formal dimerization of two [(2,4,6- tBu 3C 6H 2O)(PhC≡C)]P=Co(CO) 3 fragments, is discussed. However, ( tBu)(PhC≡C)PCl, VII, reacts with II, to yield the cluster compound VIII, containing the two μ 2-bridging units ( tBu)[(η 2-C≡CPh)Co 2(CO) 5]P and ( tBu)(PhC≡C)P. Compounds II and VI–VIII were identified from their analytical and spectroscopic (IR, 1H-, 13C- and 31P-NMR) data. The molecular structure of the cluster compound VIII was determined by an X-ray diffraction study. 相似文献
9.
The hydrothermal reactions of vanadium oxide starting materials with divalent transition metal cations in the presence of nitrogen donor chelating ligands yield the bimetallic cluster complexes with the formulae [{Cd(phen 2) 2V 4O 12]·5H 2O (1) and [Ni(phen) 3] 2[V 4O 12]·17.5H 2O (2). Crystal data: C 48H 52Cd 2N 8O 22V 4 (1), triclinic.
a=10.3366(10), b=11.320(3), c=13.268(3) Å, =103.888(17)°, β=92.256(15)°, γ=107.444(14)°, Z=1; C 72H 131N 12Ni 2O 29.5V 4 (2), triclinic.
a=12.305(3), b=13.172(6), c=15.133(4), =79.05(3)°, β=76.09(2)°, γ=74.66(3)°, Z=1. Data were collected on a Siemens P4 four-circle diffractometer at 293 K in the range 1.59° <θ<26.02° and 2.01°<θ<25.01° using the ω-scan technique, respectively. The structure of 1 consists of a [V 4O 12] 4− cluster covalently attached to two {Cd(phen) 2} 2+ fragments, in which the [V 4O 12] 4− cluster adopts a chair-like configuration. In the structure of 2, the [V 4O 12] 4− cluster is isolated. And the complex formed a layer structure via hydrogen bonds between the [V 4O 12] 4− unit and crystallization water molecules. 相似文献
10.
Medium-resolution spectra of the N 2 b 1Π u-X 1Σ g+ band system were recorded by 1 + 1 multiphoton ionization. In the spectra we found different linewidths for transitions to different vibrational levels in the b 1Π u state: Δν 0 = 0.50 ± 0.05 cm −1, Δν 1 = 0.28 ± 0.02 cm −1, Δν 2 = 0.65 ± 0.06 cm −1, Δν 3 = 3.2 ± 0.5 cm −1, Δν 4 = 0.60 ± 0.07 cm −1, and Δν 5 = 0.28 ± 0.02 cm −1. From these linewidths, predissociation lifetimes τ ν were obtained: τ 0 = 16 ± 3 ps, τ 1 > 150 ps, τ 2 = 10 ± 2 ps, τ 3 = 1.6 ± 0.3 ps, τ 4 = 9 ± 2 ps, and τ 5 > 150 ps. Band origins and rotational constants for the b 1Π uν = 0 and 1 levels were determined for the 14N 2 and 14N 15N molecules. 相似文献
11.
In the system PbF 2/AsF 5/anhydrous hydrogen fluoride (aHF) two new lead(II) hexafluoroarsenates(V) Pb(HF)(AsF 6) 2 and PbFAsF 6 were isolated. Pb(HF)(AsF 6) 2 is formed when the molar ratio AsF 5:PbF 2 is 2 or higher. It crystallizes in the space group Pbcn with a=1058.3(3) pm, b=1520.9(6) pm, c=1079.4(3) pm, V=1.7374(10) nm 3 and Z=8. The HF molecule is directly connected to the Pb center, eight fluorine atoms from three different AsF 6− ions (Pb–F distances ranging from 248(4) to 276(2) pm) and one further fluorine at 306(3) pm complete the coordination sphere. PbFAsF 6 is obtained when equimolar amounts of PbF 2 and AsF 5 react in aHF. PbFAsF 6 crystallizes in the space group P
with: a=466.10(10) pm, b=723.70(10) pm, c=747.40(10) pm, =105.930(10)°, β=101.49(2)°, γ=90.660(10)°, V=0.23698(7) nm 3 and Z=2. The basic unit in the structure of PbF(AsF 6) consists of a four-membered ring of two Pb and two F atoms. The Pb atoms in the ring are further connected by two AsF 6− units via cis-fluorine bridges, thus forming a [PbF(AsF 6)] 2 cluster, which interacts by additional Pb–F bonds thus forming a ribbon-like polymer. 相似文献
12.
Irradiation of the 30-electron Mo 2(η 5-C 5Me 5) 2(CO) 4 and Re 2(CO) 10 in toluene solution (containing H 2O) afforded (in 1–2% yields) a novel triangular metal cluster, (η 5-C 5Me 5) 3Mo 3(CO) 4(η 2-H)(η 3-O) (1), which was characterized by a single-crystal X-ray diffraction study. Compound 1, of pseudo Cs- m symmetry, has a triangulo-Mo 3(η 3-O) core with composite Mo---H---Mo and Mo---Mo electron-pair bonds along one unusually short edge (2.660(1) Å) and Mo--- electron-pair bonds along the other two edges (2.916(1) and 2.917(1) Å). The edge-bridged hydride ligand, which displays a characteristic high-field proton NMR resonance at δ −17.79 ppm, was not found from the crystallographic determination but was located via a quantitative potential-energy-minimization method. This procedure unambiguously established that the optimized hydrogen position, which corresponds to a distinct coordination site with identical Mo---H distances of 1.85 Å, is the only one that can be sterically occupied by a metal-bound hydride ligand. This 46-electron species is the first electron-deficient trimolybdenum cluster containing a monoprotonated Mo---Mo double bond; its existence is attributed to ligand overcrowding due to the bulky pentamethylcyclopentadienyl rings. Black (η 5- C 5Me 5) 3Mo 3(CO) 4(η 2-H)(η 3-O) · 1/2THF crystallizes with two formula species in a triclinic unit cell of P1 symmetry with a 8.603(4), b 11.115(4), c 19.412(11) Å, 80.69(4)°, β 101.10(4)°, and γ 98.88(3)° at −40° C. Least-squares refinement (RAELS with 221 variables) of one independent Mo 3 molecule and a centrosymmetrically-disordered THF molecule converged at R1( F) 5.62%, R2( F 6.88% for 8460 independent diffractometry data ( I0 ρ 3σ( I0 collected at −40° C with Mo- K radiation 相似文献
13.
The molecular structure and conformational properties of O=C(N=S(O)F 2) 2 (carbonylbisimidosulfuryl fluoride) were determined by gas electron diffraction (GED) and quantumchemical calculations (HF/3-21G* and B3LYP/6-31G*). The analysis of the GED intensities resulted in a mixture of 76(12)% syn– syn and 24(12)% syn– anti conformer (Δ H0= H0( syn– anti)− H0( syn– syn)=1.11(32) kcal mol −1) which is in agreement with the interpretation of the IR spectra (68(5)% syn– syn and 32(5)% syn– anti, Δ H0=0.87(11) kcal mol −1). syn and anti describe the orientation of the S=N bonds relative to the C=O bond. In both conformers the S=O bonds of the two N=S(O)F 2 groups are trans to the C–N bonds. According to the theoretical calculations, structures with cis orientation of an S=O bond with respect to a C–N bond do not correspond to minima on the energy hyperface. The HF/3-21G* approximation predicts preference of the syn– anti structure (Δ E=−0.11 kcal mol −1) and the B3LYP/6-31G* method results in an energy difference (Δ E=1.85 kcal mol −1) which is slightly larger than the experimental values. The following geometric parameters for the O=C(N=S) 2 skeleton were derived ( ra values with 3 σ uncertainties): C=O 1.193 (9) Å, C–N 1.365 (9) Å, S=N 1.466 (5) Å, O=C–N 125.1 (6)° and C–N=S 125.3 (10)°. The geometric parameters are reproduced satisfactorily by the HF/3-21G* approximation, except for the C–N=S angle which is too large by ca. 6°. The B3LYP method predicts all bonds to be too long by 0.02–0.05 Å and the C–N=S angle to be too small by ca. 4°. 相似文献
14.
Six mononuclear complexes [M(L 1) 2(H 2O) 4] (M = Co(II), 1a and M = Mn(II), 1b), [Cu(L 1) 2(H 2O) 2] (1c), [Cu(L 1) 2(H 2O)(Py) 2] (1d), [Cu(L 3)(H 2O)Cl] · H 2O (3a) and [Co(Sal)(H 2O)(Py) 3] · 2ClO 4 · H 2O (3b) of phenoxyacetic acid derivatives and Schiff base were determined by single crystal X-ray diffraction. The Co(II) (1a) and Mn(II) (1b) complexes are isomorphous. X-ray crystal structural analyses reveal that these coordination complexes form polymeric structure via formation of different types of hydrogen bonding and π-stacking interactions in solid. Thermal analysis along with the powder X-ray diffraction data of these complexes shows the importance of the coordinated and/or crystal water molecules in stabilizing the MOF structure. Complexes 1a, 1c, 3a show marginal catalytic activity in the oxidation of olefins to epoxides in the presence of i-butyraldehyde and molecular oxygen. 相似文献
15.
Naphthaleneytterbium, C 10H 8Yb(THF) 3, reacts with Cp 2Cr, Cp 2Co, Cp 2Ni, and Cp 2V in THF to give Cp 2Yb. In the case of the reaction of C 10H 8Yb(THF) 3 with Cp 2V, vanadium-containing intermediates could be isolated. One of them, CpVC 10H 8VCp, has been characterized by X-ray diffraction. The crystals are monoclinic, space group P2 1/ n, with a 907.0(5), b 798.8(3), c 1080.8(5) pm, β 105.21(4)°; Z = 2. The structure was refined to R = 0.0288 for 1131 observed reflections ( Fo > 4σ( Fo)). 相似文献
16.
The two-level factorial design (FD) and principal component analysis (PCA) chemometric techniques were used to investigate the carbon–hydrogen bond lengths dependence on the basis set size and quantum chemistry method, for H–C≡CH, H–C≡CF, H–C≡CCH 3, H–C≡CCN, H–C≡CCl and H–C≡CCCH molecular systems. The calculations were performed by using Hartree-Fock (HF), Møller-Plesset 2 (MP2) and Density Functional Theory (DFT) with B3LYP exchange-correlation functional methods. The effects concerning basis set size include the number of valence and polarization functions as well as the cooperative effect between them, at all computational levels. The increase in the number of valence functions decreases the calculated C–H bond lengths by approximately 0.0022 Å, while the inclusion of polarization functions at HF and B3LYP levels increases the C–H bond length, in contrast to the behavior obtained at MP2 level. The effect of the inclusion of diffuse functions is non-significant, at all three computational levels. Moreover, the valence–polarization interaction effects are not significant, except at the MP2 calculational level, in which such effects lead to an increase in the calculated C–H bond lengths. When the computational level changes from HF→B3LYP and B3LYP→MP2 the calculated C–H bond length values increase (on average) by +0.0100 and +0.0027 Å, respectively. Algebraic models (one for each level of calculation) successfully employed to reproduce the calculated values for H–C≡N bond length, a system not included in the training set. The HF/6-31G(d,p) and HF/6-31++G(d,p) results yield the lowest standard errors (0.0015 and 0.0014 Å, respectively) and correspond to the calculated points in closest proximity to the experimental one. 相似文献
17.
In connection with heliangine, extracted from leaves of Helianthus tuberosus L., the crystal structure of dihydroheliangine monochloroacetate, C 22H 29C 7Cl, has been determined by X-ray methods. The tetragonal unit cell with dimensions, A = 13·77, C = 11·95 Å, contains four molecules, the space group being P4 1 - C 42 or P4 3 - C 44. Using a three-dimensional Patterson function and minimum functions, a majority of atomic positions were determined. Further elucidation of the structure was continued by alternative application of successive least squares treatment and Fourier syntheses. The structure thus determined is fully consistent with the chemical results obtained by Morimoto et al. The final R-value is 0·134 (using 1680 data with sin 2 θ/λ 2 < 0·20) or 0·152 (using 2419 data with sin 2θ/λ 2 < 0·27). 相似文献
18.
Two new Cd(II) complexes with a 3-(2-pyridyl)pyrazole-based ligand, [Cd(L) 2(SCN) 2] (1) and {[Cd(L) 2N 3](ClO 4)} n (2) (L=3-(2-pyridyl)pyrazol-1-ylmethylbenzene) were synthesized and structurally characterized by elemental analyses, IR and single crystal X-ray diffraction analysis. Complex 1 crystallizes in the monoclinic system, space group C2/ c, with a=14.833(3), b=13.790(3), c=15.970(3) Å, β=110.89(3)° and Z=4, while 2 crystallizes in the monoclinic system, space group P2 1/ c, with a=13.622(4), b=23.286(7), c=10.547(3) Å, β=111.084(6)° and Z=4. In the two complexes, the Cd(II) centers are coordinated by six nitrogen atoms, in which four from two distinct L ligands and two from thiocyanato (1) or azido (2) anions. Complex 1 has a mononuclear structure, whereas 2 has a 1D chain structure bridged by azido anions. In 2, the azido adopts a μ-1,3- trans coordination mode, which is not common in the azide Cd(II) complexes. In addition, in the structure of 2, the 1D chains were further assembled into a quasi-3D supramolecular network by the C–HO hydrogen-bonding interactions. The structural difference of the two complexes is attributable to the different anions, which have different coordination natures. 相似文献
19.
The phase diagram of the system CePO 4–K 3PO 4 has been determined based on investigations by differential thermal analysis, X-ray powder diffraction, IR spectroscopy and optical microscopy. The system contains only one intermediate compound K 3Ce(PO 4) 2, which melts incongruently at (1500±20)°C. This compound is stable down to room temperature and exhibits a polymorphic transition at 1180°C. It was confirmed that the low-temperature form β-K 3Ce(PO 4) 2 crystallizes in a monoclinic system, space group P2 1/m with unit cell parameters a=9.579 (5), b=5.634 (6), c=7.468 (5) Å; =γ=90°, β=90.81 (3)°; V=403.083 Å 3. 相似文献
20.
Discotic β-diketonate liquid crystals containing palladium(II), and oxovanadium(IV), (V≡0), analogous to known copper complexes (which display discotic lamellar and columnar mesophases), have been prepared and characterized. These are the first enantiotropic discotics containing Pd(II) and among the earliest examples containing VO(IV). The best-behaved Pd(II) complex is [Pd(DK 10, 10) 2], and it also is probable that the complexes [Pd(DK n,n) 2] ( n = 7-9) are mesomorphic, however their characterization is difficult due to decomposition in the isotropic phase. The mesophase of [Pd(DK 10 2,10 2) 2], which appears below 100°C, is suggested to be an example of the rare N d phase on the basis of optical microscopy. The complex [VO(DK8,8) 2] is an enantiotropic discotic vanadyl complex; the monotropic behaviour of [VO(DK 10,10) 2] was also confirmed. It is suggested that the discotic phase which occurs for [VO(DK 8,8) 2] is more organized than that of [Cu(DK 8,8) 2]. 相似文献
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