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81.
Manmath Narwane Dorothy Priyanka Dorairaj Yu-Lun Chang Ramasamy Karvembu Yu-Han Huang Hsueh-Wei Chang Sodio C. N. Hsu 《Molecules (Basel, Switzerland)》2021,26(23)
Zn(II) complexes bearing tris[3-(2-pyridyl)-pyrazolyl] borate (Tppy) ligand (1–3) was synthesized and examined by spectroscopic and analytical tools. Mononuclear [TppyZnCl] (1) has a Zn(II) centre with one arm (pyrazolyl-pyridyl) dangling outside the coordination sphere which is a novel finding in TppyZn(II) chemistry. In complex [TppyZn(H2O)][BF4] (2) hydrogen bonding interaction of aqua moiety stabilizes the dangling arm. In addition, solution state behaviour of complex 1 confirms the tridentate binding mode and reactivity studies show the exogenous axial substituents used to form the [TppyZnN3] (3). The complexes (1–3) were tested for their ability to bind with Calf thymus (CT) DNA and Bovine serum albumin (BSA) wherein they revealed to exhibit good binding constant values with both the biomolecules in the order of 104–105 M−1. The intercalative binding mode with CT DNA was confirmed from the UV-Visible absorption, viscosity, and ethidium bromide (EB) DNA displacement studies. Further, the complexes were tested for in vitro cytotoxic ability on four triple-negative breast cancer (TNBC) cell lines (MDA-MB-231, MDA-MB-468, HCC1937, and Hs 578T). All three complexes (1–3) exhibited good IC50 values (6.81 to 16.87 μM for 24 h as seen from the MTS assay) results which indicated that these complexes were found to be potential anticancer agents against the TNBC cells. 相似文献
82.
An atom-efficient and environmentally friendly approach to the synthesis of 2,5-disubstituted-1,3,4-thidiazine derivatives has been developed. These compounds were synthesized by a reaction of 2-(2-bromoacetyl)benzofuran and thiocarbohydrazide with various aryl aldehydes, acetylacetones, and pthalic anhydrides in good yields. The advantages of this methodology are mild reaction conditions, easy workup procedure, clean reaction profile, shorter reaction time, and a wide range of substrate applicability. The structures of all synthesized compounds were confirmed from their analytical and spectral data. 相似文献
83.
AbstractMetal cations observed with tetrachloroaluminate anion provide insights into the structure and stability of reactive cations. Addition of tris(3,5-dimethylpyrazolyl)borate anion (TpMe2) to [BiCl2][AlCl4] traps a bismuth(III) dication, [TpMe2Bi]2+, possessing a highly electrophilic bismuth center with short coordinate Bi―N bonds. [TpMe2Bi]2+ has weak interactions with the chlorides of [Bi3Cl13]∞. Strong affinity of [TpMe2Bi]2+ with the triflate (OTf) observed in [TpMe2Bi(OTf)3]- demonstrates the high electrophilicity at bismuth. 相似文献
84.
Highly efficient Oppenauer-type oxidation of secondary alcohols to the corresponding ketones has been realized by means of the ruthenium(II) complex catalysts bearing a 2-(benzoimidazol-2-yl)-6-(3,5-dimethylpyrazol-1-yl)pyridine ligand. The oxidation reaction underwent in the presence of acetone as oxidant under mild conditions, reaching final TOF values up to 3960 h−1. The hemilability of the ligand is attributed to the high catalytic activity of these Ru(II) complexes. 相似文献
85.
A. García-Fernández 《Journal of organometallic chemistry》2010,695(2):162-169
Complex [RuCl{κ3(N,N,N)-Tp}(PPh3)(PTA)] (κ3(N,N,N)-Tp = hydridotris(pyrazolyl)borate) containing the water-soluble phosphane 1,3,5-triaza-7-phosphatricyclo[3.3.1.13,7]decane (PTA) reacts with terminal alkynes producing to the corresponding neutral alkynyl complexes [Ru(CCR){κ3(N,N,N)-Tp}(PPh3)(PTA)] (R = Ph (1a), nBu (1b), 1-cyclopentenyl (1c), p-methoxyphenyl (1d), 6-methoxynaft-2-yl (1e)). When halide is extracted from complex [RuCl{κ3(N,N,N)-Tp}(PPh3)(PTA)] followed by treatment with propargyl alcohols, the corresponding allenylidene complexes [Ru{κ3(N,N,N)-Tp}(PPh3)(PTA)(CCCPh2)][X] (X = PF6 (2a), CF3SO3 (2b)) and [Ru{κ3(N,N,N)-Tp}(PPh3)(PTA)(CCCC12H8)][PF6] (3) result. Electrophilic attack on the complexes thus obtained leads chemoselectively to the alkynyl complexes [Ru(CCR){κ3(N,N,N)-Tp}(PPh3)(1-CH3-PTA)][CF3SO3] (R = Ph (4a), nBu (4b), and 1-cyclopentenyl (4c)) and to the dicationic allenylidene complexes [Ru{κ3(N,N,N)-Tp}(PPh3)(1-H-PTA)(CCCC12H8)][PF6]2 (5) and [Ru{κ3(N,N,N)-Tp}(PPh3)(1-CH3-PTA)(CCCPh2)][CF3SO3]2 (6). 相似文献
86.
Almudena García-Fernández Josefina Díez Ángel Manteca Jesús Sánchez M. Pilar Gamasa Elena Lastra 《Polyhedron》2008
A series of half-sandwich ruthenium(II) complexes containing κ3(N,N,N)-hydridotris(pyrazolyl)borate (κ3(N,N,N)-Tp) and the water-soluble phosphane 1,3,5-triaza-7-phosphaadamantane (PTA) [RuX{κ3(N,N,N)-Tp}(PPh3)2−n(PTA)n] (n = 2, X = Cl (1), n = 1, X = Cl (2), I (3), NCS (4), H (5)) and [Ru{κ3(N,N,N)-Tp}(PPh3)(PTA)L][PF6] (L = NCMe (6), PTA (7)) have been synthesized. Complexes containing 1-methyl-3,5-diaza-1-azonia-7-phosphaadamantane(m-PTA) triflate [RuCl{κ3(N,N,N)-Tp}(m-PTA)2][CF3SO3]2 (8) and [RuX{κ3(N,N,N)-Tp}(PPh3)(m-PTA)][CF3SO3] (X = Cl (9), H (10)) have been obtained by treatment, respectively, of complexes 1, 2 and 5 with methyl triflate. Single crystal X-ray diffraction analysis for complexes 1, 2 and 4 have been carried out. DNA binding properties by using a mobility shift assay and antimicrobial activity of selected complexes have been evaluated. 相似文献
87.
两个半夹心型聚吡唑硼酸盐羧酸钴配合物的合成、结构及催化活性 总被引:1,自引:0,他引:1
设计合成了2个结构新颖的半夹心单核聚吡唑硼酸盐羧酸配合物Tp*Co(Hglu)(CH3OH)(1)和Tp*Co(Hsub)(H2O)(2)[Tp*=三聚(3,5-二甲基吡唑)硼酸根, H2glu=戊二酸, H2sub=辛二酸], 并通过元素分析、 红外光谱、 紫外-可见光谱和X射线单晶结构分析对标题配合物进行了表征. 结构分析表明, 在配合物1和2中, 配体Tp*都是三齿配位, 配位模式相同; 戊二酸和辛二酸都以μ1-η1-η1的端基配位模式与金属相连. 此外, 还对配合物的热稳定性进行了详细分析, 并初步探讨了配合物催化氧化环己烷的催化活性. 相似文献
88.
Yoshiyuki Misumi 《Journal of organometallic chemistry》2006,691(14):3157-3164
The Rh(III)-thiolate complex [Tp∗Rh(SPh)2(MeCN)] (2; Tp∗ = hydrotris(3,5-dimethylpyrazolyl)borate) readily undergoes substitution of MeCN by XyNC (Xy = 2,6-dimethylphenyl) to give the isocyanide complex [Tp∗Rh(SPh)2(XyNC)] (3), whereas reaction of 2 with terminal alkynes results in the formation of the rhodathiacyclobutene complex [Tp∗Rh(SPh){η2-CHCR(SPh)}] (4; R = aryl, alkyl). Molecular structures of 3 and 4 (R = CH2Ph) have been determined by single crystal X-ray diffraction. Complex 2 as well as [Tp∗Rh(cyclooctene)(MeCN)] have been found to catalyze regioselective addition of benzenethiol to terminal alkynes RCCH at 50 °C to give R(PhS)CCH2 in moderate to high yields. The above products are selectively formed when R = CH2Ph and n-C6H13, while cis-RCHCHSPh and RC(SPh)2CH3 are also obtained as by-products when R = p-MeOC6H4. Catalytic cycle involving 2 and 4 is proposed based on the mechanistic studies using NMR measurement. 相似文献
89.
Two new oxovanadium (IV) complexes VO(HB(pz)3)(H2B(pz)2) (1) and VO(B(pz)4)2 (2) have been obtained by the reaction of oxovanadium sulfate with the corresponding ligands KHB(pz)3, KH2B(pz)2 and KB(pz)4, respectively. The two complexes were characterized by elemental analyses, IR, UV–Vis and X-ray diffraction. Complex 1 crystallizes in the orthorhombic space group, Pca21. Complex 2 crystallizes in the orthorhombic space group, Pna21. In both complexes, five nitrogen atoms and one oxygen atom coordinate to the vanadium atom, forming a distorted octahedral geometry (VON5). In addition, related spectra characterization, hydrogen-binding properties, structural configuration and quantum chemistry calculations are also discussed. 相似文献
90.
Gabriele Albertin Stefano Antoniutti Marco Bortoluzzi Gianluigi Zanardo 《Journal of organometallic chemistry》2005,690(7):1726-1738
Chloro phosphite complexes RuClTpL(PPh3) (1a, 1b) [L = P(OEt)3, PPh(OEt)2] and RuClTp[P(OEt)3]2 (1c) [Tp = hydridotris(pyrazolyl)borate] were prepared by allowing RuClTp(PPh3)2 to react with an excess of phosphite. Treatment of the chloro complexes 1 with NaBH4 in ethanol yielded the hydride RuHTpL(PPh3) (2a, 2b) and RuHTp[P(OEt)3]2 (2c) derivatives. Protonation reaction of 2 with Brønsted acids was studied and led to thermally unstable (above 10 °C) dihydrogen [Ru(η2- H2)TpL(PPh3)]+ (3a, 3b) and [Ru(η2-H2)Tp{P(OEt)3}2]+ (3c) complexes. The presence of the η2-H2 ligand is indicated by short T1 min values and JHD measurements of the partially deuterated derivatives. Aquo [RuTp(H2O)L(PPh3)]BPh4 (4), carbonyl [RuTp(CO)L(PPh3)]BPh4 (5), and nitrile [RuTp(CH3CN)L(PPh3)]BPh4 (6) derivatives [L = P(OEt)3] were prepared by substituting H2 in the η2-H2 derivatives 3. Vinylidene [RuTp{CC(H)R}L(PPh3)]BPh4 (7, 8) (R = Ph, tBu) and allenylidene [RuTp(CCCR1R2)L(PPh3)]BPh4 (9-11) complexes (R1 = R2 = Ph, R1 = Ph R2 = Me) were also prepared by allowing dihydrogen complexes 3 to react with the appropriate HCCR and HCCC(OH)R1R2 alkynes. Deprotonation of vinylidene complexes 7, 8 with NEt3 was studied and led to acetylide Ru(CCR)TpL(PPh3) (12, 13) derivatives. The trichlorostannyl Ru(SnCl3)TpL(PPh3) (14) compound was also prepared by allowing the chloro complex RuClTpL(PPh3) to react with SnCl2 · 2H2O in CH2Cl2. 相似文献