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1.
《Inorganica chimica acta》1986,121(2):167-174
The reaction of 2,3-tri with CrCl3·6H2O1, dehydrated in boiling DMF, results in the formation of mer-CrCl3(2,3-tri) and anation of hydrolysed solutions of mer-MCl3(2,3,-tri) (M=Co, Cr) with 6 M HCl containing HClO4, forms trans-dichloro- mer-[MCl2(2,3-tri)(OH2)]ClO4·H2O (M=Cr, Co; I, II). trans-Dinitro-mer-[Co(NO2)2(NH3)(2,3-tri)] ClO4 crystallises from the reaction between mer-Co(NO2)3(2,3-tri) and aqueous 7 M ammonia, on addition of NaClO4·H2O, and trans-dichloro-mer-[CoCl2(NH3)(2,3-tri)]ClO4 (III) can be isolated by treatment of the dinitro with 12 M HCl. Reaction of mer-CoCl3(2,3-tri) with C2O42, followed by addition of aqueous NH3 and NaClO4·H2O results in the isolation of racemic mer-[Co(ox)(NH3)(2,3-tri)]ClO4· H2O. This complex was resolved into its enantiomeric forms and treatment of these with SOCl2/MeOH/ HClO4 gave the chiral forms of trans-dichloro-mer- [CoCl2(NH3)(2,3-tri)]ClO4 (R or S at the see-NH center). The rates of loss of the first chloro ligand from these dichloro complexes have been measured spectrophotometrically in 0.1 M HNO3 over a 15 K temperature range to give the following kinetic parameters; (I) kH(298)=7.25 × 10−5 s−1, Ea=78.5 kJ mol−1, δS298#=69 J K−1 mol−1; (II) kH(298)=4.00 × 10−3 s−1, Ea=89.9, δS298#= +87.5; (III) kH(298)=3.09 × 10−4 s−1, Ea=103, δS298#=+27. Treatment of the dichloro cations with Hg2+/HNO3 results in the generation of mer- M(2,3-tri)(OH2)33+ (M=Cr, Co; IV, V) and trans- diaqua-mer-Co(NH3)(2,3-tri)(OH2)23+ (VI). The Co(III) cations isomerise to the fac configuration with (V) Kisom(298) μ=1.0 M)=2.97 × 10−5 s−1, Ea=115, δS298#=+46. (VI) Kisom(298) (μ=1.0 M)=4.13 × 10−5 s−1, Ea=113, δS298#=+52.  相似文献   

2.
《Inorganica chimica acta》1986,121(2):223-228
One isomer of [CrCl(N-Me-tn)(dien)]ZnCl4 has been isolated from the reaction of CrCl3·6H2O, dehydrated in DMF, with the polyamines N-methyl- 1,3-diaminopropane and diethylenetriamine. This complex is isomorphous with δλ-(R,S)usft-[CoCl(N-Me-tn)(dien)] ZnCl4 and thus has the unsym-fac- configuration with the N-Me group trans to the sec-NH group of the coordinated triamine. The Cr(III) complex has been resolved with NH4BCS and the chiroptical parameters of (-)488-[CrCl(N-Me-tn)(dien)]- ZnCl4, derived from the less soluble diastereoisomeride by metathesis, are similar to those obtained for the less soluble (-)534-λ-(S)-a,cb,edf-Co(III) analogue, of known absolute configuration. Kinetic parameters for the rates of thermal aquation (μ= 1.0 M, HClO4) and Hg2+-assisted chloride release (μ= 1.0 M) for usft-[CrCl(N-Me-tn)(dien)]ZnCl4 are kH= 3.7 × 10−6 s−1, Ea=93 ± 8 kJ mol−1, ΔS2984t#= −45 ± 16 J K−1 mol−1 and kHg=2.01 × 10−3 M−1 s−1, Ea=64.2 ± 3.3, ΔS298#=−89.5 ± 7, respectively at 298 K.  相似文献   

3.
《Inorganica chimica acta》1988,146(2):161-165
The compound [Cr(en)3][ZnCl4]Cl has been synthesized by reaction of CrCl3·6H2O, Zn and [Cr(en)3]2(SO4)3 in HCl. Its molecular and crystalline structure was determined by X-ray diffraction methods, being monoclinic, P21/c, a=21.215(3), b=12.532(2), c=13.707(2) Å, β=95.21°, V= 3629(2) Å3, Dx=1.738g cm−3, MW=474.9, Z= 8, F(000)=1928, λ(Mo Kα)=0.71069 Å, μ(Mo Kα)= 27.04 cm−1, 288 K. No significant exchange interactions between Cr(III) cations in the crystalline lattice were found. Curie-Weiss behavior was found in the three directions tested (g1=2.06±0.02,g2= 2.08±0.02,g3=2.09±0.01), T=1.2-1.4 K.  相似文献   

4.
Photolysis of the allenylidene pentacarbonyl chromium complexes [(CO)5CrCCC(R1)R2] (R1=NMe2, NPh2; R2=NMe2, OMe, Ph) in THF in the presence of equimolar amounts of XR3 (XR3=various phosphanes, P(OMe)3, AsPh3, SbPh3) affords cis-allenylidene tetracarbonyl XR3 complexes, cis-[(CO)4(XR3)CrCCC(R1)R2]. When in the photolysis of [(CO)5CrCCC(NMe2)Ph], the phosphanes PR3 (R=C6H4F-p, C6H4Cl-p, OMe) are used in excess (three equivalents) two carbonyl ligands are displaced and the mer-tricarbonyl complexes mer-[(CO)3(PR3)2CrCCC(NMe2)Ph] are formed both PR3 ligands being mutually trans. The structure of the new complexes is established by IR, NMR, and UV-Vis spectroscopy, that of cis-[(CO)4(PPh3)CrCCC(NMe2)Ph] additionally by an X-ray structural analysis. As indicated by the spectroscopic data of the compounds, these complexes are best described as hybrids of allenylidene and zwitterionic alkynyl complexes with delocalization of the electron pair at nitrogen bonded to the Cγ atom of the allenylidene ligand towards the metal center. The relative contribution of the allenylidene and zwitterionic alkynyl resonance forms is influenced by XR3. Increasing the donor properties of XR3 favors the allenylidene resonance form.  相似文献   

5.
Two new polynuclear complexes of Cu(II), [(μ-1,1,3-N3)2{Cu2(me2tn)2(N3)2}]n (1) (me2tn=2,2-dimethylpropane-1,3-diamine) and [Cu2(μ-C2O4)(μ-N3)(ipr2en)2]n(ClO4)n (2) (ipr2en=N,N-di-isopropylethane-1,2-diamine) have been synthesized and structurally characterized by X-ray crystallography. The crystal structure of 1 displays a 2D network in which distorted octahedral copper(II) centers, chelated by a me2tn ligand and bound to a terminal azide, are connected through μ-1,1,3 bridging azide anions. The structure of 2 shows 1D chains comprising alternating [(ipr2en)Cu-Ox-Cu(ipr2en)] units and end-to-end azide ligand. The chains on mutual H-bonding interaction through ClO4, give rise to a 2D supramolecular architecture. The magnetic data of complexes were recorded in the temperature range, 300-2 K. In case of complex 1, the magnetic data are consistent with a ferromagnetic interaction through the end-on azide bridge (JFM=10 cm−1) and a weak antiferromagnetic interaction (zj=−0.8 cm−1) between the ferromagnetically coupled dimers and an average g-value of 2.05. The susceptibility data of 2 were fitted using an alternating AF-AF chain spin 1/2 law which leads to the following parameters Joxalate=−180 cm−1, Jazide=−43 cm−1 and g=2.25 cm−1.  相似文献   

6.
The kinetics and mechanism of a linear trihydroxamic acid siderophore (deferriferrioxamine B, H4DFB+) ligand exchange with Al(H2O)63+ to form mono(deferriferrioxamine B)aluminum(III) (Al(H2O)4H3DFB)3+ have been investigated at 25 °C over the [H+] range 0.001−1.0 M and I = 2.0 M (HClO4/NaClO4) by 27Al NMR. Kinetic results are consistent with Al(H2O)4(H3DFB)3+ formation and dissociation proceeding through a parallel path mechanistic scheme involving Al(H2O)63+(k2/k−1) and Al(H2O)5(OH)2+(k2/k−2) where k1 = 0.13 M−1 s−1, k−1 = 8.7 × 10−3 M−1 s−1, k2 = 2.7 × 103 M−1 s−1, and k−2 = 9.6 × 10−4 s−1. Relative complex formation rates at Al(H2O)63+ and Al(H2O)5OH2+, and comparison with kinetic data for a series of synthetic hydroxamic acids, suggest that an interchange mechanism is operative. These results are also discussed in relation to kinetic data for the corresponding iron(III)-deferriferrioxamine B system.  相似文献   

7.
The preparation and characterization of dichloro- (hydrotris(1-pyrazolyl)borato)pyridinechromium(III), CrCl2(HB(PYZ)3)Py, (Py = pyridine and HB(PYZ)3-1 is the hydrotris(1-pyrazolyl)borato anion) is described. The structure of the compound was determined by single crystal X-ray diffraction. Crystals were monoclinic, P21/c, a = 11.603(2), b = 9.845(1), c = 16.095(2) Å, β = 96.04(1)° with four formula units in the unit cell. Intensities were measured on a Nicolet P3 diffractometer with use of Mokα radiation. The structure was solved by standard methods and refined to R1 = 0.0601, R2 = 0.0397 based on 3142 independent reflections. Bond lengths and angles are normal. The pyridine molecule is oriented such that the plane bisects the angle between the two cis pyrazole rings. The synthesis and preparation of the related Cr(III) species CrCl2(HB(PYZ)3)pyrazole, Ph4As[CrCl3HB(PYZ)3] and [Cr(HB(PYZ)3)2]PF6 are described and the evaluation of the CrCl2(HB(PYZ)3)L (L = pyridine or pyrazole) species for genotoxicity is discussed.  相似文献   

8.
Reaction of the mercury(II) amide Hg[N(SiMe3)3]2 with 3,3′-disubstituted binaphthols (HO)2C20H10(R)2-3,3′ (R = SiMe3, SiMe2Ph, SiMePh2, SiPh3) in a 2:1 stoichiometric ratio furnishes four hexacyclic 1,7-disilylsubstituted derivatives of peri-xanthenoxanthene (PXX). Reaction of these two reagents in a 1:1 ratio results in a mixture of the hexacyclic products as well as the related pentacyclic species which contain one hydroxyl group and only one C-O-C ring fusion. The structures of three of the hexacyclic products (R = SiMe3, SiMe2Ph, SiMePh2) and one of the pentacyclic products (R = SiMe3) have been obtained. The reaction of Hg[N(SiMe3)3]2 with the 3,3′-disubstituted binaphthols proceeds via an intramolecular electrophilic aromatic substitution reaction and several intermediates in this process have been detected using NMR (1H and 199Hg) spectroscopy.  相似文献   

9.
Two compounds of empirical formula MCl3- (THF)3, M = V and Cr, have been characterized by single crystal X-ray studies. The VCl3(THF)3 molecule, which has a mer octahedral stereochemistry, crystallizes in the monoclinic space group P21/c with a= 8.847(2),b= 12.861(5),c= 15.134(3) Å, β = 91.94(2)°, V = 1721(1) Å3 and Z = 4. The V-Ci(1) and V-CI(2) distances have a mean value of 2.330 [3] Å while V-CI(3) = 2.297(2) Å, The VO(1) and VO(2) distances have a mean value of 2.061[8] Å while V-O(3) = 2.102(3) Å cis ClVCl angles average 92.0[5]° and cis OVO angles average 86.2[2]° . The isostmctural complex, CrCl3(THF)3, has a crystal structure made up of discrete octahedral mer-CrCl3(THF)3 molecules with the following unit cell dimensions (space group P21/c): a = 8.715(1), b= 12.786(3), c = 15.122(3) Å, β = 92.15(1)°, V = 1684(1) Å3 and Z = 4. The CrCl(1) and CrCl(2) distances have a mean value of 2.310131 Å while CrCl(3) = 2.283(2) Å. The CrO(1) and CrO(2) distances have a mean value of 2.0101171 Å while CrO(3) = 2.077(4) Å. cis ClCrCl angles average 90.9[4]° and cis OCrO angles average 86.1 [2]°. The structures of these two octahedral complexes and those previously reported for ScCl3(THF)3 and TiCl3(THF)3 are compared and certain general trends are discussed.  相似文献   

10.
《Inorganica chimica acta》2006,359(7):2015-2022
The reaction of [Cu(tren)(OH2)](ClO4)2 with KCN gave a mononuclear complex [Cu(tren)(CN)](ClO4) (1) (tren = tris(2-aminoethyl)amine). Using 1 as a building block, one pentanuclear compound, [{Cu(tren)(NC)}4Ni](ClO4)6 (2) and two trinuclear complexes, [{Cu(tren)NC}2Co(tren)](ClO4)5 · 2H2O (3), [{Cu(tren)CN}2NiL](ClO4)4 (4) (L = 3,10-bis(2-hydroxyethyl)-1,3,5,8,10,12-hexaazacyclotetradecane) were prepared and characterized by single crystal X-ray analysis. In 1, Cu(II) atom adopts a distorted trigonal bipyramidal (TBP) geometry. In 2, the Ni(II) atom occupies the center of the pentanuclear compound with a square-planar coordination geometry. In 3, the six-coordinated Co(III) atom presents a distorted octahedral geometry with four nitrogen atoms from tren and two carbon atoms of bridged cyano groups in cis-positions. In 4, the nickel atom is located in an inversion center and coordinated with two [(tren)CuCN]+ moieties through cyano-bridging ligands. Magnetic susceptibility measurements of 24 show that the magnetic interactions between the heterometallic ions are antiferromagnetical coupling through the cyano bridges with g = 2.25, J = −0.142 cm−1 and J = −0.167 cm−1 for 2, g = 2.06, J = −0.094 cm−1 for 3, and g = 2.20, J = −33.133 cm−1 for 4. The correlations between the structures and the J values are discussed.  相似文献   

11.
The kinetics and stereochemistry for the base catalysed substitution reactions of all seven isomers (4 mer and 3 fac) of both [Co(dien)(ibn)Cl]2+ and [Co(dien)(ampy)Cl]2+ have been studied in detail, for water and azide ion as entering groups. The stereochemistry for the azide ion anation of some of the [Co(dien)(diamine)OH]2+ species have also been investigated. The mer isomers are of comparable reactivity and amongst the fastest reacting pentaaminechlorocobalt(III) complexes known. They are also much faster to hydrolyse than the fac species. In both the ibn and ampy systems, a common product stereochemistry is observed for the four reactant mer isomers (the product is a mixture of all four mer configurations), for both azide ion and water as nucleophiles, but not for the three fac reactants (H2O as nucleophile). The kinetic and equilibrium distributions are quite different. For the mer isomer reactions, a common trigonal bipyramidal five-coordinate intermediate deprotonated at the sec-NH of the dien is overwhelmingly implicated. The substitution mechanisms are argued in detail. Other data reported include isomerisation rates and equilibrium distributions for some mer-hydroxo and a mer-aqua complex of exceptional reactivity, equilibrium distributions for the mer-phosphato complexes in the ampy system under different pH conditions, the crystal structure for the isolated m1-[Co(dien)(ampy)OP(OH)3]Cl3 · 2H2O species, and a rationale for its predominance at neutral pH based on internal H-bonding.  相似文献   

12.
《Carbohydrate research》1986,154(1):127-144
The synthesis of all four deoxyfluoro-α-d-glucopyranosyl phosphates is described. Rate constants for their acid-catalyzed hydrolysis were determined, and fluorine substitution was shown to have a significant effect in lowering the rate, particularly when the substitution is adjacent to the anomeric center. Relative rate-constants measured in m HClO4 at 25° are 60.30:1.00:7.05:3.97:16.5 for α-d-glucopyranosyl phosphate and the 2-, 3-, 4- and 6-deoxyfluoro derivatives, respectively. The hydrolysis of 2-deoxy-2-fluoro-α-d-glucopyranosyl phosphate was studied in more detail, and an activation entropy and enthalpy of 4.1 e.u. (m reactant) and 113.5 kJ.mol−1, respectively, were determined for hydrolysis in m HClO4 at 60° The pH dependence of its hydrolysis was investigated, and rate constants for hydrolysis of the monoanion (kM = 1.88 × 10−6 s−1) and neutral (kN = 6.23 × 10−5 s−1) species were thus extracted. Hydrolysis of the monoanion is not significantly affected by fluorine substitution, as expected. The ability or inability of several mechanistically distinct enzymes to utilize these fluorinated substrates is rationalized in the light of these findings.  相似文献   

13.
A series of 4-substituted proline amides was synthesized and evaluated as inhibitors of dipeptidyl pepdidase IV for the treatment of type 2 diabetes. (3,3-Difluoro-pyrrolidin-1-yl)-[(2S,4S)-(4-(4-pyrimidin-2-yl-piperazin-1-yl)-pyrrolidin-2-yl]-methanone (5) emerged as a potent (IC50 = 13 nM) and selective compound, with high oral bioavailability in preclinical species and low plasma protein binding. Compound 5, PF-00734200, was selected for development as a potential new treatment for type 2 diabetes.  相似文献   

14.
The complexation of Al3+, Zn2+, Cd2+ and Pb2+ by the 3-hydroxyflavones: 3-hydroxy-2-(2-methoxyphenyl)-4H-1-benzopyran-4-one (H1) and 3-hydroxy-2-(4-methoxyphenyl)-4H-1-benzopyran-4-one (H2), and by the 3-methoxythioflavone: 3-hydroxy-2-(2-methoxyphenyl)-4H-1-benzopyran-4-thione (H3) have been studied spectrophotometrically and fluorimetrically to determine the corresponding complexation constants, Ksp and Kfl, in 5:95 water:ethanol (v/v) solution for which [HClO4] was either 10−2 or 10−5 mol dm−3 and I = 0.10 mol dm−3 (NaClO4) at 298.2 K. Complexation occurs dominantly through the deprotonated ligand for [Al(1)]2+ and [Al(2)]2+ for which log Ksp = 4.51 and 4.73, respectively, in 10−2 mol dm−3 HClO4 and 4.21 and 4.61 in 10−5 mol dm−3 HClO4. For Pb2+ complexation by H1, H2 and H3 is characterized by log Ksp = 2.20, 2.57 and 3.22, respectively, in 10−2 mol dm−3 HClO4 and 4.70, 5.38 and 5.74 in 10−5 mol dm−3 HClO4. Equilibrium mixtures of [Pb(H1)]2+ and [Pb1]+, [Pb(H2)]2+ and [Pb2]+, and [Pb(H3)]2+ and [Pb3]+ appear to be formed. Complexation of Zn2+ and Cd2+ by all three ligands was only detected in 10−5 mol dm−3 HClO4. For Zn2+ complexation by H1, H2 and H3 log Ksp = 3.22, 3.74 and 4.46 and for Cd2+ the corresponding values are 2.39, 2.40 and 3.72 for Cd2+. Only [Al1]2+ and [Al2]2+ show significant fluorescence and are characterized by log Kfl = 6.30 and 7.49 in 10−2 mol dm−3 HClO4.  相似文献   

15.
Two competing reactions are present when benzene solutions of the five co-ordinate complex CrCl3·2NMe3 are treated with donor molecules viz., a) ligand substitution via solvolysis of metal-nitrogen bonds and b) the independent decomposition of the bis-trimethylamine adduct into tri-μ-chloro-trichlorotris(trimethylamine) dichromium(III), Cr2Cl6(NMe3)3, and trimethylamine. For all but very feeble donors reaction a) predominates and in the ensuing adduct formation the chromium(III) ions assume hexacoordination, e.g. pyridine and tetrahydrofuran react immediately to give the corresponding CrCl3·3L complexes. Reaction b) shows second order kinetics with a rate constant k = 0.160 1 mole−1 sec−1 The spectral and magnetic properties of the binuclear compound Cr2Cl6(NMe3)3 have been interpreted in terms of adjacent six co-ordinate metal atoms and a proposed structure is based on two fused octahedra sharing a common trigonal face. The product obtained on treatment of CrCl3·2NMe3 with AgClO4 involves only bidentate (C2v) perchlorate ions as co-ordinated ligand and is formulated as Cr(ClO4)3.  相似文献   

16.
The crystal structure of [Sm(OPMePh2)4I2]I, 1, was determined by X-ray diffraction and refined anisotropically to a final R value of 0.067 from 3040 reflections with I>3.0σ(I). The space group was P2/a and Z=2. The unit cell dimensions were: a= 17.777(6), b=13.559(2), c=11.656(4) Å, α=γ= 90.0 and β=97.25(3)°. The cation geometry was octahedral with the Sm(III) bonded to two mutually trans I ions and four OPMePh2 groups. A third non-bonded I was present elsewhere in the cell. The SmI and SmO distances were 3.077(1) and 2.27(1) Å respectively. Two of the SmOP angles were 172.1(6)° and the other two were 162.0(6)°.  相似文献   

17.
《Inorganica chimica acta》1988,154(2):209-214
The diastereoisomeric complex Δ-(+)-tris(cyclicO,O′, 1 (R), 2(R)(−)dimethylethylene dithiophosphato)chromium(III), was synthesized stereoselectively in tetrahydrofuran (THF) solution. The complex proves optically labile, [α]D=+106, in CHCl3, changing quickly to [α]D=+211. The CD spectra in THF enable us to characterize the complex and show a configuration inversion which gives the diastereoisomeric equilibrium Λ⇌Δ with an excess of the Λ-(R,R)(R,R)(R,R) diastereoisomeric form. The equilibrium constant K=0.86 at 25 °C is indicative of a different thermodynamic stability between the two diastereoisomers in THF solution, Λ-(R,R)> Δ-(R,R), δΔH°=1.5 kJ mol−1, δΔG°=0.3 kJ mol−1, δΔS°=4 J mol−1 K−1. The kinetic diastereoisomer Δ-(R,R)(R,R)(R,R) is stabilized in CHCl3, CH2Cl2, EtOH solvents where it is highly soluble and optically stable with a maximum negative chirality factor, g=−5×10−3, in CHCl3.  相似文献   

18.
The symmetrical anionic and neutral dimers [H(TMSO)2]2trans-[{RuCl4(TMSO)}2](μ-pyz) (1), and mer-[{RuCl3(TMSO)2}2](μ-pyz) (2) were isolated by the reaction of [H(TMSO)] trans-[RuCl4(TMSO)2] and mer-[RuCl3(TMSO)3] with heterocyclic nitrogen donor ligand pyrazine (pyz) at room temperature. These complexes can be regarded as unprecedented examples in the general Creutz-Taube family of ruthenium dimers. Each ruthenium center in 1 and 2 has a coordination environment akin to that of known anionic and neutral monomeric Ru(III) complexes. Crystals of 1 · acetone are orange, needle like, space group , a=10.419(3) Å, b=10.539(3) Å, c=12.595(5) Å, α=69.837(16)°, β=69.968(15)°, γ=74.330(15)° and crystals of 2 · 4TMSO are orange prisms, trigonal, space group , a=33.971(5) Å, b=33.971(5) Å, c=12.210(2) Å, α=90°, β=90° and γ=120°.  相似文献   

19.
The polymeric [PdCl(dithiocarbamate)]n complexes, in which the ligand ion is dimethyldithiocarbamate (DMDT), pyrrolidine dithiocarbamate (PyDT, (CH2)4NCS2) and sarcosine ethyl ester dithiocarbamate (ESDT, EtO2CCH2N(CH3)CS2), have been reacted with chelating diamines, like ethylenediamine (en) or 1,3-diaminopropane (dap) and long chain diamines, like 1,4-diaminobutane (dab) or 1,7-diaminoheptane (dah). The reaction products depend on either diamine chain length or molar ratio. By operating at PdCl(dithiocarbamate)/diamine molar ratio 1:1 chelating diamines yielded the ionic [Pd(dithiocarbamate)(diamine)]Cl species (diamine = en or dap), whereas with long chain diamines species of the type [Pd(dithiocarbamate)(diamine)]nCln (diamine = dab or dah) were obtained, in which each Pd(dithiocarbamate)+ unit binds to the NH2 group of two different molecules, in a network of bridging diamines. At molar ratio 1:0.5, the long chain diamines yielded the binuclear [Pd2Cl2(dithiocarbamate)2(diamine)] complexes (diamine = dab or dah), whereas exchange reactions take place generally in the presence of en or dap. The reaction trend is described on the basis of IR and proton NMR spectra. The new dithiocarbamate complexes were preliminarily tested for their cytotoxicity on human cancer cells.  相似文献   

20.
The crystal structure of Ni(C4H4NCOS)2[(C6H5)3P]2, Ni(ptc)2(Ph3P)2, has been determined by single crystal X-ray diffraction methods. This species exists as a square planar complex. The structure is monoclinic, P21/n, a=12.759(4), b=10.069(2), c= 16.158(6) Å, and β=91.96(3)°. The unit cell contains 2 formula units with an observed density of 1.31 g cm−3 (1.34 calculated). The final R index= 0.047 (Rw=0.038) for 2618 non-zero reflections having I > 3 σ(I).  相似文献   

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