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Ni(II) complexes with 2,2-dipyridylamine and salicylaldehydes: Synthesis, crystal structure and interaction with calf-thymus DNA and albumins

The synthesis of four cationic mixed?ligand Ni(II) complexes with 2,2??dipyridylamine (dpamH) and substituted salicylaldehydes (X?saloH) was undertaken in an effort to discover new biologically active compounds. The complexes with the general formula [Ni(dpamH)2(X?salo)]Cl, 3?6, namely [Ni(dpamH)2(5?Cl?salo)]Cl, 3, [Ni(dpamH)2(5?Br?salo)]Cl, 4, [Ni(dpamH)2(5?CH3?salo)]Cl, 5, and [Ni(dpamH)2(3?OCH3?salo)]Cl¡¤CH3OH, 6, were characterized by elemental analyses, FT?IR and UV?vis spectroscopy, magnetic and conductivity measurements. In addition, two analogous nickel?salicylaldehydato complexes in the absence of dpamH were prepared and characterized as [Ni(5?Cl?salo)2(CH3OH)2], 1 and [Ni(5?Br?salo)2(CH3OH)2], 2. The structures of complexes 1?6 were determined by X?ray crystallography revealing octahedral coordination of nickel (II) and monomeric nature of the compounds. Spectroscopic (UV?vis), electrochemical (cyclic voltammetry) and physicochemical (viscosity measurements) techniques were employed in order to study the binding mode and strength of the complexes to calf?thymus (CT) DNA, while competitive studies with ethidium bromide (EB), performed by fluorescence spectroscopy, revealed the ability of the complexes to displace the DNA-bound EB. The complexes bind to DNA probably via intercalation exhibiting high DNA?binding constants. For the cationic complexes 3?6, the coexistence of an electrostatic interaction with CT DNA may be also suggested. The interaction of the complexes with serum albumins was studied by fluorescence emission spectroscopy and the determined binding constants exhibit relative high values.

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Tetrahydropyran – Wikipedia,
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Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.category: Tetrahydropyrans, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 499-40-1, in my other articles.

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11. In a Article£¬once mentioned of 499-40-1, category: Tetrahydropyrans

Diarylamino functionalized pyrene derivatives for use in blue OLEDs and complex formation

Three new 2,2?-dipyridylamino functionalized pyrene derivatives, 1-pyrenyl-2,2?-dipyridylamine (1), 4-(1-pyrenyl)phenyl-2,2?- dipyridylamine (2), and 4-[4?-(1-pyrenyl)biphenyl]-2,2?- dipyridylamine (3) have been synthesized and fully characterized. For comparison of electronic properties, a diphenylamino functionalized molecule 4-[4?-(1-pyrenyl)biphenyl]diphenylamine (4) has also been synthesized. Compounds 1-4 are bright blue emitters in solution and in the solid state with lambdamax at ?420-460 nm and a high emission efficiency in solution. All four compounds form amorphous glasses with Tg values of 66 C, 79 C, 165 C, and 98 C, respectively. The electronic properties of the four compounds were examined by spectroscopic methods, cyclic voltammetry and Gaussian 98 molecular orbital calculations. The utilities of this class of molecules in OLEDs have been demonstrated by EL devices of compounds 3 and 4, which showed that 3 can function as a bright blue emitter and an electron transport material in a double-layer device while 4 can function as a bright blue emitter and a hole transport molecule in a triple-layer device. The dipyridylamino functional group in molecules 1-3 are capable of chelating to metal ions such as Zn(II) as demonstrated by the synthesis and structure of the complex [2-(Zn(O2CCF3) 2]2 (5). The binding of Zn(II) ions to the dipyridyl group causes a reduction of the emission efficiency of the ligand 2.

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Tetrahydropyran – Wikipedia,
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Synthesis and cyanide anion recognition of a new displacement fluorescence chemosensor based on two-branched aurone

A new fluorescence turn-on chemosensor based on two dipyridylamine groups substituted aurone moiety, 4?-2,2?-dipyridylamine-3-2,2?-dipyridylamine aurone (1), was synthesized. The recognition properties of the compound for cyanide anions and copper ions were investigated. Yellow fluorescence of the compound is almost quenched completely because of the complexation between the compound and copper ions. After the subsequent addition of cyanide anions, fluorescence spectrum is recovered to the original status of the compound owing to the strong bonding ability between cyanide anions and copper ions and the removal of copper ions from the complexes. The recognition also can be observed by naked eye. The compound exhibits a good reversibility and can be used repeatedly to recognize cyanide anions for several times.

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Tetrahydropyran – Wikipedia,
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499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11, belongs to Tetrahydropyrans compound, is a common compound. In a patnet, once mentioned the new application about 499-40-1, COA of Formula: C12H22O11

The synthesis and application of novel Ni(ii) N-alkyl dipyridylaldiminato complexes as selective ethylene oligomerisation catalysts

A series of N-alkyl 2,2?-dipyridylamine ligands of general formula (2-C5H3NR)2NR?, (a): R = H, R? = Me; (b): R = H, R? = benzyl; (c): R = H, R? = methylcyclohexyl; (d): R = H, R? = neopentyl; (e): R = Me, R? = Me) were prepared by a modified method involving base-mediated N-alkylation with the respective alkyl halide. Reaction of the ligands, a-e, with NiCl2(DME) allowed for the isolation of mu-Cl Ni(ii) complexes: [Ni(mu-Cl){a}Cl]2 (1a); [Ni(mu-Cl){b}Cl]2 (1b); [Ni(mu-Cl){c}Cl]2 (1c); [Ni(mu-Cl){d}Cl]2 (1d) and [Ni(mu-Cl){e}Cl]2 (1e). The complexes were characterised by FT-IR spectroscopy, magnetic susceptibility measurements, mass spectrometry, elemental analyses and in the case of 1a, SCD analysis. In the case of complex 1e, an acid-mediated hydrolysis process was identified. The product of hydrolysis, the protonated ligand and a tetrachloronickelate salt (1e-A), was characterised by SCD analysis. Activation of 1a-1e with alkyl aluminium reagents generated highly active catalysts for the oligomerisation of ethylene, with activities of up to 864 kg oligomers molNi-1 h-1 and high selectivity toward the formation of butenes. In general, trans 2-butene was observed as the major isomer, with the exception of 1e. In the case of 1e, the selectivity for 1-butene was 98%, thereby demonstrating the significant effect that the introduction of a low degree of steric pressure in the coordination sphere of the catalyst has on selectivity.

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Tetrahydropyran – Wikipedia,
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Tetranuclear pyrophosphate-bridged Cu(II) complex with 2,2?-dipyridylamine: Crystal structure, spectroscopy and magnetism

Use of pyrophosphate, 2,2?-dipyridylamine (hdpa) with Cu(NO3)2 ¡¤ 3H2O has enabled to synthesize a novel tetranuclear copper(II) complex, [Cu4(hdpa)4(mu-P2O7)2] ¡¤ 11H2O 1, which was characterized by single crystal X-ray diffraction, IR, ESR spectrum, and variable-temperature magnetic susceptibilities (4.2-300 K). Extensive pi-pi stackings and H-bonding water clusters resulting from 11 free water molecules join Cu4 units to make a 3D network. According to the molecular structure, the experimental data were fitted to the expressions derived from the Hamiltonian H = – 2 J12 over(S, ^)1 over(S, ^)2 – 2 J13 (over(S, ^)1 over(S, ^)3 + over(S, ^)2 over(S, ^)4) – 2 J14 (over(S, ^)1 over(S, ^)4 + over(S, ^)2 over(S, ^)4) showing dominant antiferromagnetic behaviors.

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Tetrahydropyran – Wikipedia,
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Controllable Synthesis of Lindqvist Alkoxopolyoxovanadate Clusters as Heterogeneous Catalysts for Sulfoxidation of Sulfides

Six alkoxohexavanadate-based Cu- or Co-POVs [Cu(dpa)(acac)(H2O)]2[V6O13(OMe)6] (1), [Cu(phen)(acac)(MeOH)]2[V6O13(OMe)6] (2), [Co(dpa)(acac)2]2[V6O13(OMe)6]¡¤2MeOH (3), [Co(phen)(acac)2]2[V6O13(OMe)6] (4), [Cu(dpa)(acac)]2[VIV2VV4O12(OMe)7] (5), and [Cu(dpa)(acac)(MeOH)]2[VIV2VV4O11(OMe)8] (6) (POV = polyoxovanadate; dpa = 2,2?-dipyridine amine; phen = 1,10-phenanthroline; acac = acetylacetone anion) have been synthesized by controlling the reaction conditions and characterized by single-crystal X-ray diffraction and powder X-ray diffraction analyses, FT-IR spectroscopy, element analyses, and X-ray photoelectron spectroscopy. In compounds 1-4 and 6, Cu or Co complexes and alkoxohexavanadate anions are assembled through electrostatic interactions. Differently, in compound 5, seven-methoxo-substituted Lindqvist-type [V6O12(OMe)7]2- are bridged to Cu complex via terminal O atoms by coordination bonds. All compounds 1-6 exhibit excellent heterogeneous catalytic performance in oxidative desulfurization and CEES ((2-chloroethyl) ethyl sulfide, a sulfur mustard simulant) abatement with H2O2 as oxidant. Among them, the catalytic activity of 6 [conv. of DBT (dibenzothiophene) up to 100% in 6 h; conv. of CEES reached 100% and selectivity of CEESO ((2-chloroethyl) ethyl sulfoxide) up to 85% after 4 h] outperforms others and can be reused without losing its activity.

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Do metal-metal multiply-bonded “ligands” have a trans influence? Structural and magnetic comparisons of heterometallic Cr=Cr…Co and Mo=Mo…Co interactions

Reported here are two new compounds containing either a Cr=Cr…Co [1, CrCrCo(dpa)4Cl2, dpa = 2,2?-dipyridylamide] or a Mo=Mo…Co [2, MoMoCo(dpa)4Cl2] framework both having a multiply-bonded unit (Cr=Cr in 1, Mo=Mo in 2) in close proximity to the Co2+ ion and trans to a Co-Cl bond. Variable temperature magnetic susceptibility measurements reveal 1 to have a temperature-dependent spin equilibrium between a low-spin (S = 1/2) and high-spin (S = 3/2) state, whereas the Co2+ ion in 2 exists solely in its high-spin state. The crystal structures of 1 and 2 were determined. Variable temperature crystallographic data of 1 at 100 K and at room temperature reveal that the spin-transition affects not only the Co-ligand bond lengths but also the terminal Cr-ligand bond lengths. Whereas the Cr…Co distance becomes shorter by 0.13 A in the low-spin form, the Co-Cl distance becomes longer by 0.2 A. These observations, along with the crystal structure of 2, suggest that the multiply-bonded M=M group has a trans influence on the Co2+ ion. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11. In a Article£¬once mentioned of 499-40-1, Quality Control of: (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal

The crystal packing of bis(2,2?-dipyridylamido)cobalt(II), Co(dpa)2, is stabilized by C-H…N bonds: Are there any real precedents?

A crystallographic study of Co(dpa)2 reveals that the pseudo-tetrahedral molecules stack together to form a one-dimensional ribbon with the molecules linked together through significant C-H…N interactions; the C…N separation is 3.41(3) A and the angle at the hydrogen atom is 177(2).

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Unexpected helicity control and helix inversion: Homochiral helical nanotubes consisting of an achiral ligand

The ligand tppda has been designed and synthesized as molecular leverage for helicity control when reacted with Cd2+ ions. The guests MeOH or DMF preferentially stabilize the P-helical isomer, while the guest H 2O causes a helix inversion to give the M-helical isomer as the major isomer without any chiral auxiliary.

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Influence of supramolecular bonding contacts on the spin crossover behaviour of iron(ii) complexes from 2,2?-dipyridylamino/s-triazine ligands

Reactions of the related ligands 2-(N,N-bis(2-pyridyl)amino)-4,6- bis(phenoxy)-(1,3,5)triazine (L1) and 2-(N,N-bis(2-pyridyl)amino)-4,6- bis(pentafluorophenoxy)-(1,3,5)triazine (L1F) with iron(ii) thiocyanate produced two spin-crossover coordination compounds with distinct cooperative behaviours. trans-[Fe(L1)2(NCS)2] ¡¤2CH2Cl2 (1) displays a very gradual transition centred at T = 233 K, characterized by a DeltaT80 (namely the temperature range within which 80% of the transition considered occurs) of 90 K, while that of fluorinated trans-[Fe(L1F)2(NCS) 2]¡¤2CH3CN (3) is significantly more abrupt (and centred at T = 238 K), with a DeltaT80 of 50 K, resulting from supramolecular contacts induced by the fluorinated phenol groups. The coordination compound equivalent to 1 with selenocyanate anions, namely trans-[Fe(L1)2(NCSe)2]¡¤4CH2Cl 2¡¤4CH3OH (2), also exhibits SCO properties centred at T = 238 K, but the transition is very gradual (DeltaT80 = 150 K). Light-induced excited spin-state trapping (LIESST) is effective although incomplete for 2 and 3, while it is complete with a TLIESST of 58 K for 1. The Royal Society of Chemistry 2013.

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Tetrahydropyran – Wikipedia,
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