共查询到20条相似文献,搜索用时 15 毫秒
1.
Daniel L. Reger Russell P. Watson Mark D. Smith 《Journal of organometallic chemistry》2007,692(24):5414-5420
The new heterometallic complex {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br][Pt(p-tolyl)2]2 has been prepared by reaction of 1 equiv. of the dimer [Pt(p-tolyl)2(μ-SEt2)]2 with the monometallic rhenium precursor {1,3,5-[CH(pz)2]3C6H3}Re(CO)3Br, where 1,3,5-[CH(pz)2]3C6H3 is the tritopic, arene-linked bis(pyrazolyl)methane ligand 1,3,5-tris[bis(1-pyrazolyl)methyl]benzene. Similarly, the heterometallic complex {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br]2[Pt(p-tolyl)2] has been made by the reaction of the dirhenium compound {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br]2 and one-half of an equivalent of [Pt(p-tolyl)2(μ-SEt2)]2. X-ray crystallographic studies of the new compounds reveal significant noncovalent interactions in their molecular and supramolecular structures. 相似文献
2.
Daniel L. Reger Russell P. Watson Mark D. Smith 《Journal of organometallic chemistry》2007,692(14):3094-3099
The new anthracene-based, bitopic bis(pyrazolyl)methane ligand 1,8-bis(4-[bis(1-pyrazolyl)methyl]phenyl)anthracene (1,8-[4-CH(pz)2C6H4]2C14H8) has been prepared by the cobalt-catalyzed reaction between thionyldipyrazole and 1,8-bis(4-formylphenyl)anthracene. The reaction between 1,8-[4-CH(pz)2C6H4]2C14H8 and Re(CO)5Br yielded the dirhenium complex {μ-1,8-[4-CH(pz)2C6H4]2C14H8}[Re(CO)3Br]2. The solid state structure of this complex displays extensive noncovalent interactions, particularly CH-π and π-π interactions. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(20):3620-3626
A new tri-functional ligand iBu2NCOCH2SOCH2CONiBu2 was prepared and characterized. The coordination chemistry of this ligand with uranyl nitrate was studied with IR, 1H NMR, electrospray mass–spectrometry, thermogravimetry, and elemental analysis. The structure of [UO2(NO3)2(iBu2NCOCH2SOCH2CONiBu2)] was determined by single-crystal X-ray diffraction. The uranium(VI) ion is surrounded by eight oxygens in a hexagonal bipyramidal geometry. Four oxygens from two nitrates and two oxygens from the ligand form a planar hexagon. The ligand is a bidentate chelate, bonding through sulfoxo and one of the carbamoyl groups to uranyl nitrate. 相似文献
4.
5.
Five iron(II) coordination polymers, {[Fe(bte)2(NCS)2][Fe(bte)(H2O)2(NCS)2]}n (1), [Fe(bime)(NCS)2]n (2), [Fe(bime)(dca)2]n (3), [Fe(bime)2(N3)2]n (4) and [Fe(btb)2(NCS)2]n (5), were synthesized using the flexible ligands 1,2-bis(1,2,4-triazol-1-yl)ethane (bte), 1,2-bis(imidazol-1-yl)ethane (bime) and 1,4-bis(1,2,4-triazol-1-yl)butane (btb), together with NCS−, dicyanamide (dca) and N3−. The compound 1 contains two kinds of motifs (double chain and single chain) and forms a three-dimensional hydrogen bonded network; 2 and 3 contain one-dimensional triple chains; and 4 and 5 form two-dimensional (4, 4) networks. The coordination anions (NCS−, dca and N3−) and the structural characteristics of the ligands (bte, bime and btb) play an important role in the assembly of the topologies. Magnetic studies reveal that 1-5 remain in the high-spin state over the whole temperature range 2-300 K and no detectable spin-crossover is observed. 相似文献
6.
Christopher M. Timperley Robert E. ArbonSally A. Saunders Matthew J. Waters 《Journal of fluorine chemistry》2002,113(1):65-78
Reaction of phosphorus trichloride with tert-butanol and fluoroalcohols gave bis(fluoroalkyl) phosphites (RFO)2P(O)H in 42-89% yield, where RF=HCF2CH2, H(CF2)2CH2, H(CF2)4CH2, CF3CH2, C2F5CH2, C3F7CH2, (CF3)2CH, (FCH2)2CH, CF3(CH3)2C, (CF3)2CH3C, CF3CH2CH2, C4F9CH2CH2 and C6F13CH2CH2. Treatment of these with chlorine in dichloromethane gave the bis(fluoroalkyl) phosphorochloridates (RFO)2P(O)Cl in 49-96% yield. The chloridate (CF3CH2O)2P(O)Cl was isolated in much lower yield from the interaction of thionyl chloride with bis(trifluoroethyl) phosphite. Heating the latter in dichloromethane with potassium fluoride and a catalytic amount of trifluoroacetic acid gave the corresponding fluoridate (CF3CH2O)2P(O)F in 84% yield. Treatment of bis(trifluoroethyl) phosphite with bromine or iodine gave the bromidate (CF3CH2O)2P(O)Br and iodidate (CF3CH2O)2P(O)I in 51 and 46% yield, respectively. The iodidate is the first dialkyl phosphoroiodidate to have been isolated and characterised properly—its discovery lags behind the first isolation of a dialkyl phosphorochloridate by over 130 years. The fluoroalkyl phosphoryl compounds are generally more stable than known unfluorinated counterparts. 相似文献
7.
《Journal of Coordination Chemistry》2012,65(11):1743-1753
Broadband (λ > 320 nm) irradiation of chloroform solutions of either [Ru(bpy)2Cl2] or [Ru(bpy)2Cl2]Cl exposed to air led to a photostationary state, in which [Ru(bpy)2Cl2]+ predominated, and to the continuous decomposition of CHCl3, as evidenced by the accumulation of HCl, hydroperoxides (CCl3OOH and CHCl2OOH), and tetra-, penta-, and hexachloroethane. The addition of Cl? increased the rate of photodecomposition, while the replacement of Cl? by F? greatly decreased the rate. The observations are consistent with a photocatalytic cycle in which [Ru(bpy)2Cl2]+ is photochemically reduced to [Ru(bpy)2Cl2], which is thermally reoxidized by CCl3OO or CCl3OOH. In the absence of air a much slower photodecomposition reaction takes place leading to continuously increasing concentrations of chloroethanes. The data are consistent with a catalytic cycle in which [Ru(bpy)2Cl2]+ is photoreduced, as in aerated solutions, while [Ru(bpy)2Cl2] is photooxidized with chloroform as the substrate. 相似文献
8.
Almudena Amoedo‐Portela Rosa Carballo Jos S. Casas Emilia García‐Martínez Ana B. Lago‐Blanco Angeles Snchez‐Gonzlez Jos Sordo Ezequiel M. Vzquez‐Lpez 《无机化学与普通化学杂志》2005,631(11):2241-2246
The new ligand bis(4‐pyridylthio)methane (4‐bpytm) ( 1 ) and its complexes [CuX2(4‐bpytm)] and [CuX2(4‐bpytm)2] (X = Cl and Br) ( 2 – 5 ) have been prepared and characterized by elemental analysis, IR‐Raman, UV/Vis spectroscopy. The structures of (4‐bpytm) ( 1 ), [CuCl2(4‐bpytm)2] ( 3 ) and [CuBr2(4‐bpytm)2] ( 4 ) were determined by single‐crystal X‐ray diffraction analysis. X‐ray analysis of the 1:2 derivatives reveals that the copper atom has a distorted (4 + 2) octahedral environment. The copper atom is coordinated by four nitrogen atoms from four bridging 4‐bpytm ligands and two halogen atoms. The axial Cu–N bonds are considerably longer than the equatorial Cu–N bonds owing to JahñTeller distortion. CuX2 units are linked to each other through bridging 4‐bpytm ligands to form a 2D interpenetrated coordination polymer. The structural parameters of the 4‐bpytm ligand in these complexes were compared with those of the free ligand. 相似文献
9.
Ming Z. Gao 《Tetrahedron letters》2004,45(29):5649-5652
The novel structures of sulfur-containing chiral bis(oxazoline) compounds which have been synthesized have been determined by X-ray crystal diffraction analyses. A high enantioselectivity (ee >99%) in the asymmetric cyclopropanation of diphenylethene with diazoester using the bis(oxazoline)-Ru(II) catalyst was obtained. 相似文献
10.
Raman scattering spectra and molecular conformations of bis(quaternaryammonium bromide)-water systems 总被引:1,自引:0,他引:1
The dimeric bis(quaternaryammonium bromide) surfactants, [Br−(CH3)2N+(C
m
H2
m
+1)—(CH2)
s
—(C
m
H2
m
+1)N+(CH3)2Br−, s = 2, 3 and m = 4, 6, 10 and 12, s = 6 and m = 8, 10, 12], have been synthesized and the phase maps of the sm6-8-water, sm6-10-water and sm6-12-water binary systems have
been determined (sm6-8 implies s = 6, m = 8). In order to examine the molecular structures of these solid samples and of their dimeric surfactant-water binary systems,
Raman spectra of the simple dimeric surfactants, sm2-4 and sm3-4, in which crystal structures of the trans- and cis-type conformations
have been determined by single-crystal X-ray diffraction analysis, have been investigated, and Raman bands characteristic
of these skeletal structures were found in the skeletal deformation region. On the basis of these characteristic Raman bands
for the two conformations, it has been concluded that the dimeric surfactants, sm6-8, sm6-10 and sm6-12 also take up a cis-type
conformation in the crystalline state. Furthermore, it has been found that the Raman bands in the C—H stretching, skeletal
stretching and CH2 scissoring regions are sensitive to phase structure.
Received: 21 July 1998 Accepted in revised form: 9 November 1998 相似文献
11.
C. Ribbing M. Odelius J. Kowalewski L. Pettersson 《Theoretical chemistry accounts》1994,87(4-5):307-312
Summary A simple non-empirical method is applied to calculate the splittings of the ground state triplet, caused by the spin-orbit coupling, in bis(aquo) bis(malonato) nickel(II), allowing for a certain geometry variation. The calculations yield splittings on the order of 10–20 cm–1. The comparison of exact (within model) and second-order perturbation theory calculations indicate that the spin Hamiltonian formalism is valid. The implications of the results for the theory of nuclear spin relaxation in paramagnetic complexes in solution are discussed. 相似文献
12.
《Journal of Coordination Chemistry》2012,65(3):390-399
Coordination polymers, {[Cd(2-mBIM)3](ClO4)2} n (1) and [Cd(BIM)2(NO3)2] n (2), have been prepared from the reaction of bis(2-methylimidazol-1-yl)methane(2-mBIM) with Cd(ClO4)2 and bis(imidazol-1-yl)methane (BIM) with Cd(NO3)2 in ethanol and water, respectively. Their structures were characterized by single crystal X-ray diffraction and IR spectroscopy. Compound 1 crystallizes in the rhombohedral space group R-3c with a = b = 12.3617(5) Å, c = 38.896(3) Å, γ = 120°, V = 5147.5(5) Å3, z = 6. The CdII occupies a crystallographic inversion center and is coordinated by six N atoms from six distinct 2-mBIM ligands to form a slightly distorted octahedral geometry. Each 2-mBIM is coordinated to two CdII cations, linking alternatively four CdII cations, resulting in a 32-membered M4L4 macrometallacycle. Compound 2 crystallizes in the monoclinic space group C2/m with a = 14.400(3) Å, b = 9.3894(18) Å, c = 8.6926(17) Å, β = 123.499(2)°, V = 980.1(3) Å3, z = 2. The Cd coordinates to four nitrogen atoms from four different BIM and two nitrates to form a slightly distorted octahedral geometry. The BIM ligands bridge to form a 1-D infinite double-bridged chain structure with 16-membered M2L2 macrometallacyclic structural units. 相似文献
13.
Olga N. Kazheva Andrey V. Kravchenko Igor B. Sivaev Irina A. Lobanova Lev I. Buravov 《Journal of organometallic chemistry》2007,692(22):5033-5043
New radical cation salts (BEDT-TTF)2[3,3′-Co(1,2-C2B9H11)2] (1), (BEDT-TTF)2[8-I-3,3′-Co(1,2-C2B9H10)(1′,2′-C2B9H11)] (2), (BMDT-TTF)[3,3′-Co(1,2-C2B9H11)2] (3) and (TMTSF)2[3,3′-Fe(1,2-C2B9H11)2] (4) were synthesized and their crystal structures and electrical conductivities were determined. Compound 4 is isostructural to the earlier reported Co analogue. All the radical cation salts synthesized are semiconductors. 相似文献
14.
S.K. Vasisht Tripat P. Kaur Jyotsna Kaushal Seema Dixit 《Journal of organometallic chemistry》1997,540(1-2):51-54
Sodium bis(trimethylstannyl)amide NaN(SnMe3)2, isolated by the reaction of trimethylstannyldiethylamine with sodium amide, reacts with tris(trimethylsilyl)hydrazino—dichloro-phosphine to form bis(trimethylsilyl)bis(trimethylstannyl)-2-phospha-2-tetrazene, (Me3Si)2N-N=P-N(SnMe3)2. Both the molecules have been isolated and characterized. 相似文献
15.
SnCl4 acts primarily as an oxidant and oxidizes monolithium bis(trimethylsilyl) hydrazide 1 to mainly bis(trimethylsilyl)amine, BSA and tris(trimethylsilyl)hydrazine, TrSH and itself get reduced to SnCl2. Similarly, reaction of SnCl4 with dilithiumbis(trimethylsilyl) hydrazide 2, oxidizes it to lithium tris(trimethylsilyl)hydrazide, Li-TrSH. Reaction of dichlorostannane (reduction of oxidation state of tin from +4 to +2) with 1 gives a simple substitution reaction and give a pale yellow solid, 1,4-bis(trimethylsilyl)-1,2,4,5-tetraza-3,6-distannacyclohexane, 3b. Whereas, in reaction of 2 with SnCl2 intermediate stannimine [(Me3Si)2N-NSn], tetramerizes and further loses tetrakis(trimethylsilyl)tetrazene, TST to give a cubane compound [(Me3Si)N-Sn]4, 4. 相似文献
16.
Highly selective poly(vinyl chloride) (PVC) membrane electrodes based on bis(2-mercaptobenzoxazolato)mercury(II) [Hg(MBO)2] and bis(2-pyridinethiolato)mercury(II) [Hg(PT)2] complexes as new carriers for thiocyanate-selective electrodes are reported. The electrodes were prepared by coating the membrane solution containing PVC, plasticizer, carriers and additives on the surface of graphite electrodes. Influence of the membrane composition, pH and possible interfering anions were investigated on the response properties of the electrodes. Both sensors exhibited Nernstian responses towards thiocyanate over a wide concentration range of 1×10−6 to 0.1 M, with slopes of 60.6±0.8 and 57.5±1.2 mV per decade of thiocyanate concentration for Hg(MBO)2 and Hg(PT)2 carriers, respectively, over a wide pH range of 3-11. The limit of detection for both electrodes was ∼6×10−7 M. The sensors have response times of ≤5 s and can be used for at least 2 months without any considerable divergence in their potential response. The proposed electrodes show fairly good discrimination of thiocyanate over several inorganic and organic anions. The electrodes were successfully applied to direct determination of thiocyanate in saliva and as indicator electrodes in precipitation titrations. 相似文献
17.
The yttrium chloride with the bridged bis(amidinate) L (L = Me3SiNC(Ph)N(CH2)3NC(Ph)NSiMe3) LYCl(DME) (2) was synthesized and structurally characterized. Treatment of LLnCl(sol)x (Ln = Yb, sol = THF, x = 2 1; Ln = Y, sol = DME, x = 1 2) with the dilithium salt Li2L(THF)0.5 afforded the novel bimetallic lanthanide complexes supported by three ligands, Ln2(μ2-L)3 · DME (Ln = Yb 3, Y 4; DME = dimethylether), instead of the designed complex LLn(μ2-L)LnL via the ligand redistribution reaction. Complexes 3 and 4 were fully characterized including X-ray analysis and 1H NMR spectrum for 4. Reaction of LnCl3 (Ln = Yb, Y) with 2 equiv. of Li2L(THF)0.5 gave the anionic complexes [Li(DME)3][L2Ln] (Ln = Yb 5, Y 6), which were confirmed by a crystal structure determination. The further study indicated that complexes 3 and 4 can also be synthesized by reaction of LnCl3 (Ln = Yb, Y) with 1.5 equiv. of Li2L(THF)0.5 or reaction of 1 and 2 with anionic complexes 5 and 6. Complexes 3, 4, 5 and 6 were found to be high active catalysts for ring-opening polymerization of ε-caprolactone (CL). 相似文献
18.
《Journal of Coordination Chemistry》2012,65(19):3158-3171
Bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone(naohH4) interacts with manganese(II) acetate in methanol followed by addition of KOH giving [MnIV(naoh)(H2O)2]. Activated ruthenium(III) chloride reacts with naohH4 in methanol yielding [RuIII(naohH4)Cl(H2O)Cl2]. The replacement of aquo by heterocyclic nitrogen donor in these complexes has been observed when the reaction is carried out in presence of heterocyclic nitrogen donors such as pyridine(py), 3-picoline(3-pic) or 4-picoline(4-pic). The molar conductance values in DMF for these complexes suggest non-electrolytic nature. Magnetic moment values suggest +4 oxidation state for manganese in its complexes, however, ruthenium(III) complexes are paramagnetic with one unpaired electron. Electronic spectral studies suggest six coordinate metal ions. IR spectra reveal that naohH4 coordinates in enol-form and keto-form to manganese and ruthenium, respectively. ESR and cyclic voltammetric studies of the complexes have also been reported. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(22):3578-3597
Six salts, ([(H2L1)(ZnCl4)] (1) (L1 = 1,1′-bis(benzimidazolyl)methane), [(H2L1)(CuCl4)]·H2O (2), [(H2L2)(ZnCl4)] (3) (L2 = 1-(3-(1H-benzimidazol-1-yl)propyl)-1H-benzimidazole), [( H2L2)(CuCl4)] (4), [(H2L3)(CuCl4)]·H2O (5) (L3 = 1- (4-(1H-benzimidazol-1-yl)butyl)-1H-benzimidazole), and [(H2L4)(ZnCl4)]·H2O (6) (L4 = 3,6-bis(imidazol-1-yl)pyridazine)), derived from bis(benzimidazole)/bis(imidazole) and metal(II) chloride dihydrate (zinc(II) chloride and copper(II) chloride dihydrate) were prepared and characterized by IR, X-ray structure analysis, elemental analysis, and TG analysis. The aromatic rings of the cations in all of the compounds are planar. X-ray diffraction analysis revealed that all the complexes have 3-D layer network structures built from hydrogen bonds between the cations and chlorometallate anions. Water molecules also play an important role in structure extension in 2, 5, and 6. The arrangements of the anions and cations in their solid state are dominated not only by size and symmetry of the cations, but also by the non-covalent interactions existing in the crystal structures. 相似文献
20.
Mathieu Dubernet 《Tetrahedron》2005,61(19):4585-4593
Substituted bis(fur-2-yl), bis(fur-3-yl) and bis(thien-2-yl) maleimides with potential antidiabetic properties are described. Their synthesis involves, as a key step, a Suzuki cross-coupling between various boron derivatives and the diiodomaleimides. Therefore, a wide range of substituted symmetric and non-symmetric maleimide derivatives can be prepared. 相似文献