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1.
Three new BiBr3 supramolecular complexes, [Bi2(3-bpdb)2Br8]·(3-H2bpdb) (1), [Bi2(3-Hbpdh)2Br8] (2) and [Bi2(4-bpdh)Br9]·3(4-Hbpdh) (3) {3-bpdb = 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene, 3-bpdh = 2,5-bis(3-pyridyl)-3,4-diaza-2,4-hexadiene and 4-bpdh = 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene} were prepared by the reaction of bismuth(III) bromide with three organic nitrogen donor based ligands under thermal gradient conditions using the branched tube method. All three compounds were structurally characterized by single-crystal X-ray diffraction. In complex 1 the bismuth atoms are coordinated by one pyridyl nitrogen atom of the 3-bpdb ligand and are bridged by two bromide atoms to produce a dimeric complex. Compound 2 consists of dimeric units and the bismuth atoms are linked by one nitrogen atom of the 3-Hbpdh ligand and by five bromide atoms, and can be considered to be six-coordinate with a Br5N array of donor atoms. The single-crystal X-ray data of compounds 1 and 3 show that the compounds contain two anionic and cationic 1D chains, [3-H2bpdb]2+[Bi2(3-bpdb)2Br8]2− and 3[4-Hbpdh]+[Bi2(4-bpdh)Br9]3−. In all three compounds extensive hydrogen-bonding interactions produce supramolecular networks. The thermal stabilities of compounds 1–3 were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). 相似文献
2.
《Journal of Coordination Chemistry》2012,65(7):1251-1260
Two coordination polymers, {[Zn(dpb)(3-bpmp)0.5]·1.5(DMF)}n (1) and [Zn(dpb)(4-bpmp)]n (2) (H2dpb = 1,3-di(4′-carboxyl-phenyl)benzene, 3-bpmp = 1,4-bis(3-pyridylmethy)piperazine, 4-bpmp = 1,4-bis(4-pyridylmethy)piperazine and DMF = N,N-dimethylformamide), were solvothermally synthesized and characterized. Tuning the difference of N-donor ligands, we obtained 1 and 2 which display different topological nets. Complex 1 features a 6-connected topological net and 2 shows a 4-connected three-fold interpenetrated framework. Luminescent properties of 1 and 2 are investigated at room temperature. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(17):2869-2874
Nanoparticles of a Bi(III) coordination polymer, {[Bi(μ-4,4′-bipy)Br4] · (4,4′-Hbipy)} n (1) (4,4′-bipy = 4,4′-bipyridine), were synthesized by a sonochemical method. The new nanoparticles were characterized by scanning electron microscopy, X-ray powder diffraction (XRD), IR spectroscopy, and elemental analyses. Compound 1 was structurally characterized by single-crystal X-ray diffraction. The thermal stabilities of 1 as bulk and at nanosize were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). The Bi2O3 and BiBr3 nanostructures were obtained by calcinations of nanostructure of 1 in air and argon. 相似文献
4.
《Journal of Coordination Chemistry》2012,65(15):2421-2428
Two new supramolecular isomeric complexes [Mn(BBA)2(H2O)2] n · 4nH2O (1) and [Mn(BBA)2(H2O)2] · 4H2O (2) were obtained by hydrothermal reactions of MnCl2 · 4H2O with 3,5-bis(isonicotinamido)benzoic acid (HBBA) under different ratio of NaOH/HBBA. Complex 1 is a 1-D zigzag chain in which the Mn(II) is six-coordinate with distorted octahedral geometry. The 1-D chains are further connected by hydrogen bonds to give a 3-D supramolecular framework. Complex 2 is a monomeric molecular complex, assembled through intermolecular hydrogen bonds into a 3-D supramolecular network. Reaction conditions have remarkable influence on the structures of the complexes. The thermal and non-linear optical properties of the complexes were studied. 相似文献
5.
《Journal of Coordination Chemistry》2012,65(14):2500-2509
Three complexes, [Mn(bpp)4(H2O)2](ClO4)2?·?1.5H2O (1), [Mn(bpp)3Br2]?·?2H2O (2), and [Mn(bpp)2(H2O)2](ClO4)?·?I?·?H2O?·?bpp (3) (bpp?=?1,3-bis(4-pyridyl)propane), were synthesized and structurally characterized by single-crystal X-ray diffraction. Complex 1 is mononuclear where M(II) is coordinated to a monodentate TT-bpp, three monodentate TG-bpp, and two water molecules. Complex 2 possesses a single-stranded helical chain formed from MnN4Br2 octahedra by a single TT-bpp, with pendant monodentate TG-bpp ligands. Complex 3 consists of a ribbon-type double-stranded chain formed from MnN4O2 octahedra by double TG-bpp ligands. 2-D supramolecular architectures of 1–3 are formed by hydrogen bonds. The fluorescence of the three complexes comes from the π*–π transition of the ligand. 相似文献
6.
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
7.
Mohamed R. Shehata Shokry A. Shokry Mahmoud A. Mabrouk 《Journal of Coordination Chemistry》2015,68(17-18):3272-3281
Pd(BHEP)Cl2 was synthesized and characterized (BHEP = 1,4-bis(2-hydroxyethyl)piperazine). The complex decomposes in two steps, leaving a residue of palladium metal. Amino acid ester (L) reacts with [Pd(BHEP)(H2O)2]2+ (BHEP = 1,4-bis(2-hydroxyethyl)piperazine), giving mixed-ligand complexes, [Pd(BHEP)L]2+. The kinetics of hydrolysis of [Pd(BHEP)L]2+ have been studied by pH-stat technique, and rate constants were obtained. Rate acceleration observed for glycine methyl ester is high. The effect with methionine methyl ester is much less marked, as the mixed-ligand complexes with these ligands do not involve alkoxycarbonyl donors. Possible mechanisms for these reactions are considered. 相似文献
8.
Bu-Lin Chen Abdullah M. Asiri Khalid A. Alamry 《Journal of Coordination Chemistry》2017,70(23):3907-3919
Copper(I) halide complexes having thermally activated delayed fluorescence (TADF) and phosphorescence have attracted much attention. Here, a series of four-coordinate dinuclear copper(I) halide complexes, [CuX(bpbp)]2 (bpbp = 2,2′-bis(diphenylphosphino)biphenyl, X = I (1), Br (2) and Cl (3)), were synthesized, and their molecular structures and photophysical properties were investigated. The structural analysis reveals that two copper(I) centers are bridged by two halogen ligands to form a dinuclear structure with a four-membered Cu2X2 ring. These complexes exhibit yellow to blue emission in the solid state at room temperature and have peak emission wavelengths at 575–487 nm with microsecond lifetimes (τ = 6.2–19.8 μs) and low emission quantum yields (<0.01%). The emissions of 1–3 originate from MLCT, XLCT, and IL (intraligand) transitions. Three complexes displayed good thermal stability. 相似文献
9.
Mohamed R. Shehata Mahmoud A. Mabrouk Rudi Van Eldik 《Journal of Coordination Chemistry》2016,69(3):522-540
[Pd(BHEP)Cl2] (BHEp = 1,4-bis(2-hydroxyethyl)piperazine) was synthesized and characterized. The palladium center has a typical square-planar geometry with a tetrahedral distortion. The alcohol groups of the ligand do not participate in binding to Pd(II). The DFT/B3LYP method was used for geometric optimization of the ligand and the complex using the Gaussian 09 program and compared with experimental results. The stoichiometry and stability constants of the complexes formed between [Pd(BHEP)(H2O)2]2+ and some selected amino acids, peptides, and DNA constituents were investigated at 25 °C and 0.1 M ionic strength. The binuclear complex [(H2O)(BHEP)Pd(Bip)Pd(BHEP)(H2O)]4+ was detected, where Bip = 4,4′-bipiperidine. Inosine, uracil, and thymine interact with the binuclear complex via substitution of both coordinated water molecules. The potentiometric results were complimented by spectroscopic measurements. The concentration distribution diagrams of the various species formed were evaluated. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(16):1835-1846
The crystal structures of [Mn(bpa)2](ClO4)2 (1), [bpa?=?bis(2-pyridylmethyl)amine], and Mn(6-Mebpa)2(ClO4)2 (2), [6-Mebpa?=?(6-methyl-2-pyridylmethyl)(2-pyridylmethyl)amine] have been determined. In 1, two facial [Mn(bpa)2]2+ isomers are observed in the same unit cell, one with C i (1a) and the other with C2 (1b) symmetries. In 2, only the isomer with C2 symmetry is observed. The structure of [Mn(bpa)2]2+ with only C2 symmetry has been reported previously (Inorg. Chem., 31, 4611 (1992)). The bond length order Mn–Namine?>?Mn–Npyridyl, observed in the C2 and the C i isomers in the crystals of 1, is the reverse of the order observed in the structure of [Mn(bpa)2](ClO4)2 which contains only the C2 isomer in the unit cell. The structure of 2 in which only the C2 isomer is found, also shows the bond length order Mn–Npyridyl?>?Mn–Namine. In cyclic voltammetric experiments in acetonitrile solutions, 1 and 2 show irreversible anodic peaks at E p?=?1.60 and 1.90?V respectively, (vs. Ag/AgCl), assigned to the oxidation of Mn(II) to Mn(III). The substantially higher oxidation potential of 2 is attributable to a higher rearrangement energy in complex 2 due to the steric effect of the methyl substituent. 相似文献
11.
Jian Li Bin Ding En‐Cui Yang Xiu‐Guang Wang Xiao‐Jun Zhao Prof. Dr. 《无机化学与普通化学杂志》2007,633(2):346-350
Two novel mercury(II) complexes [HgII(μ2‐LH)Cl2]2[HgII2(μ2‐Cl)2Cl4]·2H2O ( 1 ) and [HgII4(μ2‐L)2(μ2‐Cl)2Cl6] ( 2 ) have been synthesized by the reaction of N‐(2‐aminoethyl)piperazine (L) with HgCl2 under different pH conditions. 1 and 2 were characterized by single‐crystal X‐ray diffraction analysis. The results reveal that in 1 there exist discrete mononuclear [HgII(μ2‐LH)Cl2]+ units and binuclear [HgII2(μ2‐Cl)2Cl4]2+ unit while in 2 there exist the rarely reported discrete cylic tetranuclear [HgII4(μ3‐L)2(μ2‐Cl)2Cl6] cluster units, which are both assembled into 3D supramolecular structures via extensive hydrogen‐bonding interactions. 1 and 2 were also characterized by element analysis, FT‐IR and luminescence spectra. 相似文献
12.
Kesheng Shen Xintong Han Chuang Li Guozhen Huang Shanshan Mao Xinkui Shi 《Journal of Coordination Chemistry》2018,71(7):980-990
N,N-bis(N-methyl-2-ylmethylbenzimidazole)aniline (EtAIDB) and its transition metal complexes, [Cu(EtAIDB)Br2]·EtOH {dibromo[N,N-bis(N-methyl-2-ylmethylbenzimidazole)aniline] copper(II) ethanol} (1) and [Zn(EtAIDB)Br2] {dibromo[N,N-bis(N-methyl-2-ylmethylbenzimidazole)aniline] zinc(II)} (2), have been synthesized and characterized by elemental analysis, molar conductivity, UV–visible, and IR spectroscopy. The X-ray crystallographic studies of 1 and 2 have shown two different arrangements: 1 is distorted square-based pyramidal, while 2 can be treated as distorted tetrahedral. The cyclic voltammogram of 1 represents quasi-reversible Cu2+/Cu+ pairs. In vitro antioxidant tests showed that 1 had significant antioxidant activity against superoxide and hydroxy radicals. 相似文献
13.
Li He Jin-Ping Zeng Da-Hai Yu Hang Cong Yun-Qian Zhang Qian-Jiang Zhu 《Supramolecular chemistry》2013,25(10):619-628
The host–guest interaction of symmetrical α,α′,δ,δ′-tetramethyl-cucurbit[6]uril (TMeQ[6]) with the hydrochloride salts of N,N′-bis(4-pyridylmethyl)-1,6-hexanediamine (P6), N,N′-bis(3-pyridyl-methyl)-1,6-hexanediamine (M6) and N,N′-bis(2-pyridylmethyl)-1,6-hexanediamine (O6) was investigated via single crystal X-ray diffraction, 1H NMR spectroscopy, electronic absorption spectroscopy and fluorescence spectroscopy. Single crystal X-ray diffraction showed that the hexyl moiety of P6 or M6 was incorporated in the cavity of TMeQ[6], while the two pyridylmethyl moieties of O6 were incorporated in the TMeQ[6] cavity in the solid state. The 1H NMR results in aqueous solution revealed that the TMeQ[6]-P6 and TMeQ[6]-M6 host–guest interaction systems produce a kinetic dumbbell-shaped inclusion complex at the initial stage and then an equilibrium pseudorotaxane-shaped inclusion complex as the only product after heating. However, only the pseudorotaxane-shaped inclusion complex was observed for the TMeQ[6]-O6 host–guest interaction system. Aqueous absorption spectrophotometric analysis showed that the dumbbell-shaped inclusion complexes were stable at pH 5.6, had a host–guest ratio of 2:1 and formed quantitatively at ~1011 l2/mol2 for the TMeQ[6]-M6 and TMeQ[6]-O6 systems. The transformation from dumbbell to pseudorotaxane-shaped inclusion complexes for the TMeQ[6]-P6 and TMeQ[6]-M6 host–guest systems yielded activation energies of 59.35 ± 1.55 and 78.7 ± 3.45 kJ/mol, respectively. The pseudorotaxane-shaped inclusion complexes were stable at pH 5.6, had a host–guest ratio of 1:1 and formed quantitatively at ~107 l/mol for the TMeQ[6]-M6 and TMeQ[6]-P6 systems. 相似文献
14.
《Journal of Coordination Chemistry》2012,65(7):1186-1193
Nanorod crystals of two new mercury(II) [Hg(II)] coordination polymers, [Hg(4-bpdh)Br2] n (1) and [Hg(3-bpdh)Br2] n (2) {4-bpdh = 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene and 3-bpdh = 2,5-bis(3-pyridyl)-3,4-diaza-2,4-hexadiene}, were prepared from the reaction of Hg(II) bromide with 4-bpdh and 3-bpdh by a sonochemical method. The nanorod crystals of 1 and 2 were characterized by scanning electron microscopy, X-ray powder diffraction, and IR spectroscopy. Compounds 1 and 2 were structurally characterized by single-crystal X-ray diffraction. The thermal stabilities of 1 and 2 were studied by thermal gravimetric and differential thermal analyses, which revealed that nanostructures of 1 and 2 are somewhat less stable than their bulk materials. 相似文献
15.
Rodrigo S. Bitzer Lorenzo C. Visentin Manfredo Hörner Marco A. C. Nascimento 《Journal of Coordination Chemistry》2017,70(6):1089-1104
A scarcity of metal complexes containing (E)-N,N′-bis(heteroaryl)iminoisoindolines has prompted us to investigate the coordinating ability and supramolecular behavior of (E)-N,N′-bis(2-pyridyl)iminoisoindoline (2-pyimiso), a versatile iminobis(pyridyl) ligand. The 1:1 reaction of HgCl2 with 2-pyimiso in MeOH afforded a dinuclear complex, [{HgCl(2-pyimiso)}2(μ-Cl)2] (1). The complex has been characterized by elemental microanalysis, vibrational spectroscopy (FTIR and FT-Raman) and 1H NMR spectroscopy. DFT calculations at the B3LYP-D3/LACV3P** level have been used in support of our vibrational analysis. Single-crystal X-ray diffraction data have shown that the coordination geometry of 1 is intermediate between the trigonal pyramidal and seesaw shapes insofar as each Hg(II) is four-coordinate and 2-pyimiso is a monodentate ligand. X-ray structure and Hirshfeld surface analyses have revealed that the supramolecular arrangement of 1 comprises perpendicular 1-D chains along the [011] direction assembled by nonclassical C–H?Cl–Hg and C–H?π hydrogen bonds. Moreover, adjacent sheets parallel to the bc-plane are interconnected by C–H?Npy, π–πpy stacking, and Hg?πpy interactions. 相似文献
16.
Ling-Yan Kong Taka-aki Okamura Norikazu Ueyama 《Journal of solid state chemistry》2004,177(7):2271-2280
Five novel coordination polymers, [Co(bpb)2Cl2] (1), [Co(bpb)2(SCN)2] (2), [Cd(H4bpb)0.5(dmf)(NO3)2] (3), [Cd2(H4bpb)Br4] (4), and [Hg2(H4bpb)I4] (5) [bpb=N,N′-bis(3-pyridylmethyl)-1,4-benzenedimethyleneimine, H4bpb=N,N′-bis(3-pyridylmethyl)-1,4-benzenedimethylamine], were synthesized and their structures were determined by X-ray crystallography. In the solid state, complex 1 is a 1D hinged chain, while 2 has 2D network structure with the ligand bpb serving as a bridging ligand using its two pyridyl N atoms. The imine N atoms keep free of coordination and bpb acts as a bidentate ligand in both 1 and 2. Complexes 3, 4, and 5 with reduced bpb ligand, i.e. H4bpb, show similar 2D network structure, in which ligand H4bpb serves as a tetradentate ligand. Thermogravimetric analyses for complexes 1-5 were carried out and found that they have high thermal stability. The magnetic susceptibilities of compounds 1, 2 were measured over a temperature range of 75-300 K. 相似文献
17.
《Journal of Coordination Chemistry》2012,65(16-18):2569-2583
AbstractTwo copper(II) coordination complexes, formulated as [Cu(tmen)(Clba)2] (1) and [Cu(tmen)(Hsal)2·H2O] (2) (where tmen?=?N,N,N′,N′-tetramethyl ethylenediamine (C6H16N2), Clba1? = 2-chlorobenzoate (C7H4ClO21?), and Hsal1? (C7H5O31? = monoanion of o-hydroxybenzoic acid (salicylic acid)), have been synthesized and characterized by elemental combustion analysis, spectroscopic techniques, thermal studies, and single crystal X-ray analyses. Complex 1 consists of two distinct monomeric units in which the coordination environment around the central copper(II) ion is a distorted octahedron with a CuN2O4 chromophore, constituted by a chelating tmen molecule, and two 2-chlorobenzoate1? anions coordinated through their carboxylate-O atoms in an asymmetrical bidentate fashion. Complex 2 is also a monomer and consists of an CuN2O3 chromophore, in which tmen is coordinated to Cu(II) through its two N atoms in a chelating bidentate fashion, and an aqua-O and the two o-hydroxybenzoate1? (HSal1?) anions are coordinated through one of their carboxylate-O atoms in a monodentate mode, forming a square pyramidal structure. Hydrogen bonding interactions especially of O–H…O, N–H…O, and C–H…Cl types interweave monomeric units and stabilize the overall crystal structures in both complexes. Thermal analysis and antibacterial activities of 1 and 2 against various bacterial strains were also investigated. 相似文献
18.
Xiu Juan Shi Peng Yun Chen Ming Ze Wu Dong Chen Cai 《Journal of Coordination Chemistry》2018,71(7):1063-1072
Hydrothermal reactions of 1,3-bis(1,2,4-triazol-1-yl)benzene (btb) and M(NO3)2 (M = Co2+ (1), Cu2+ (2)) afforded two new coordination polymers, [Co(btb)2(NO3)(H2O)]n·NO3·H2O (1) and [Cu(btb)2(NO3)2]n (2), respectively. Single-crystal X-ray diffraction reveals that 1 crystallizes in the space group P21/m and 2 crystallizes in the space group Pī, both showing a double-stranded chain structure. The 1-D chains are interconnected via π?π interactions to lead to 2-D ladder-like supramolecular architectures. In addition, magnetic behavior and thermal stability of 1 and 2 have been investigated. For 1, weak antiferromagnetic interactions are observed at low temperature, and the data obey the Curie–Weiss law χM = C/(T?θ), with C = 3.22 cm3·mol?1·K and θ = ?10.39 K. For 2, the decrease of the χT vs. T curve at low temperature is the result of intermolecular antiferromagnetic magnetic interactions. 相似文献
19.
Shubhamoy Chowdhury Arnab Bhattacharya Pinki Saha Smita Majumder E. Suresh 《Journal of Coordination Chemistry》2016,69(24):3664-3676
Employing 1-(2-methoxybenzyl)-2-(2-methoxyphenyl)-1H-benzimidazole (bpb) as a monodentate ligand, a new greenish-blue copper(II) complex, [Cu(bpb)2(NO3)2] (1a), has been synthesized. 1a has been characterized analytically and spectroscopically. The X-ray crystal structure of 1a reveals that it adopts a cis disposition with respect to the ligands. The solid state structure of 1a is stabilized by intramolecular offset face-to-face π–π stacking. Non-covalent supramolecular edge-to-face C–H?π interactions with neighboring molecules give 1-D supramolecular chains that further lead to the formation of an assembled 3-D supramolecular metal-organic framework via hydrogen bonding interactions. 1a shows blue fluorescence most likely due to intramolecular offset face-to-face π–π stacking. At room temperature, 1a is one-electron paramagnetic. It shows a rhombic EPR spectrum with g1 = 2.12, g2 = 2.42, and g3 = 2.52 in the solid state at liquid nitrogen temperature. In cyclic voltammetry, 1a displays a one-electron oxidative Cu(II)/Cu(III) couple. Our DFT calculations, corroborate the observed experimental results of 1a. 相似文献
20.
《Journal of Coordination Chemistry》2012,65(19):3333-3341
Two different coordination polymers are obtained from d10 metal ions [Zn(II) and Cd(II)] and N,N′-ethylenebisacetamide (EBA). {[Zn(EBA)1.5(NO3)]?·?(NO3)} n (1) is a 1-D coordination polymer assembled from zinc ions and EBA molecules acting as a bridging ligand. Cd(H2O)2Cl2(EBA) (2) is constructed from 1-D inorganic polymeric chains {Cd(OH2)2Cl2} n and uncoordinated N,N′-ethylenebisacetamide molecules. These chains are interconnected through hydrogen bonds resulting in a 3-D supramolecular network. The luminescent properties of the organic molecule EBA, as well as of the coordination polymers 1, and 2 have been investigated. 相似文献