共查询到20条相似文献,搜索用时 46 毫秒
1.
Synthesis and characterization of Pr(III), Nd(III) and Er(III) complexes with 2,6-pyridinedimethanol
The reactions of Ln(NO3)3?6H2O (Ln=Pr, Nd or Er) with the potentially tridentate O,N,O chelating ligand 2,6-pyridinedimethanol (H2pydm) in a 1:2 M ratio were investigated, and complexes with the formula [Ln(H2pydm)2(NO3)2](NO3) (Ln=Pr or Nd) (1 and 2) and [Er(H2pydm)3](NO3)3 (3) were isolated. The compounds contain 10-coordinate Pr(III) and Nd(III) ions that crystallize in the triclinic space group P-1 while the 9-coordinate Er(III) complex crystallizes in the monoclinic system (P21/n). A new lanthanide complex, [Pr(H2pydm)3](Cl)3?DMF (4), has been synthesized by reaction of PrCl3?6H2O and H2pydm. The nine-coordinate Pr(III) is bound to three H2pydm ligands. X-ray crystal structures of 1–4 reveal that the ligand coordinates tridentate via the pyridyl nitrogen and the two hydroxyl oxygens. The electronic absorption spectra of 1–4 show 4f–4f transitions. 相似文献
2.
Ling Li Jian Fan Taka-Aki Okamura Yi-Zhi Li Norikazu Ueyama 《Supramolecular chemistry》2013,25(5):361-370
Assembly of three-connecting ligands 1,3,5-tris(1-imidazolyl)benzene (tib) and 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene (titmb) with cadmium(II) and silver(I) salts provide new metal-organic frameworks, [Cd(tib)2](NO3)2·4H2O (1), [Ag(tib)(PPh3)](CF3SO3) (2) and [Ag(titmb)(PPh3)](CF3SO3)·1.5H2O (3) (PPh3=triphenylphosphine). Single-crystal X-ray diffraction studies reveal that complexes 1 and 3 are two-dimensional honeycomb networks, while complex 2 is a noninterpenetrated three-dimensional architecture with (10,3)-a topology. The results indicate that the nature (structure and flexibility) of the organic ligands and the bulky auxiliary ligand have great impact on the assembly and structure of metal-organic frameworks. The photoluminescent properties of the synthesized complexes were studied in the solid state at room temperature. 相似文献
3.
Two new copper(II) complexes of [Cu(Ofloxacin)(phen)(H2O)] · (NO3) · 2H2O and [Cu(Levofloxacin)(phen)(H2O)] · (NO3) · 2H2O were obtained and their structures were studies. Both ligands and complexes were assayed against gram-positive and gram-negative
bacteria by the in vitro doubling dilutions method. The inhibitory effect of the ligands and complexes on the leukemia HL-60
cell line were measured with the MTT assay method and the liver cancer HePG-2 cell line measured by the SRB method. The results
indicated that the complexes have stronger inhibitory effect on HL-60 than on HePG-2. The complex [Cu(Levofloxacin)(phen)(H2O)] · (NO3) · 2H2O (I) has stronger effect on HL-60 than the complex (Cu(Ofloxacin)(phen)(H2O)] · (NO3) · 2H2O (II).
The text was submitted by the authors in English. 相似文献
4.
《Journal of Coordination Chemistry》2012,65(6):945-955
Two new erbium compounds, [Er2(BDC)3(DMF)2] (1) and [Er2(CQC)3(DMF)3(H2O)]?·?DMF?·?H2O (2), where BDC stands for 1,4-benzenedicarboxylate, CQC for 2-(4-carboxyquinolin-2-yl)quinoline-4-carboxylate, and DMF for N,N-dimethylformamide, have been synthesized through pre-heating and cooling-down crystallization. In 1 the Er(III) is seven-coordinate with oxygen atoms from six BDC and one DMF, forming a three-dimensional open-framework structure. Compound 2 possesses a 2D structure based on dinuclear Er(III) building units. The photoluminescence of 1 has also been investigated. 相似文献
5.
Wenshen C. Yi L. Chuanpei Z. Songsheng Q. 《Journal of Thermal Analysis and Calorimetry》2001,66(2):463-468
The solid-state coordination reaction: Nd(NO3)3·6H2O(s)+4Ala(s) → Nd(Ala)4(NO3)3·H2O(s)+5H2O(l) and Er(NO3)3·6H2O(s)+4Ala(s) → Er(Ala)4(NO3)3·H2O(s)+5H2O(l) have been studied by classical solution calorimetry. The molar dissolution enthalpies of the reactants and the products
in 2 mol L–1 HCl solvent of
these two solid-solid coordination reactions have been measured using a calorimeter. From the results and other auxiliary
quantities, the standard molar formation enthalpies of [Nd(Ala)4(NO3)3·H2O, s, 298.2 K] and[Er(Ala)4(NO3)3·H2O, s,298.2 K] at 298.2 K have been determined to be Δf
H
m
0 [Nd(Ala)4(NO3)3·H2O,s, 298.2 K]=–3867.2 kJ mol–1, and Δf
H
m
0 [Er(Ala)4(NO3)3·H2O, s, 298.2 K]=–3821.5 kJ mol–1.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
6.
L. J. Wang H. L. Guo W. T. Wu Sh. Y. He 《Russian Journal of Coordination Chemistry》2009,35(12):925-931
Three new lanthanide(III) complexes with N-(2-propionic acid)-salicyloylhydrazone (H2L, C10H10N2O4) ligand [La(HL)2(NO3)(H2O)2]3 ·4H2O(I), [Gd(HL)3] · 2(C2H5)3 N(II) and [Er(L)(HL)(H2O)2] · 2H2O(III) has been synthesized and characterized by elemental analyses, IR, UV, and molar conductivity. The crystal structures of
three complexes have been determined by X-ray single-crystal diffractometer. In complex I, the La3+ ion is ten-coordinated by two tridentate ligands, one bidentate nitrate, and two water molecules. In complex II, the Gd3+ ion has a coordination number of nine by three tridentate ligands. In complex III, the Er3+ ion is eight-coordinated by two tridentate ligands and two water molecules. In all structures, tridentate ligands are coordinated
by carboxyl O and acyl O atoms and azomethine N atom to form two stable five-membered rings sharing one side in the keto mode
as indicated by the results of crystal structures and infrared spectral analysis. 相似文献
7.
This article represents two types of entanglements, [Co2(bibp)(BTB)2][Co(bibp)2(H2O)2] (1) and [Co3(bibp)2(H2O)2(BTB)2]·2H2O·2DMF (2) (bibp = 4,4′-bis(1-imidazolyl)biphenyl and H3BTB = 1,3,5-tris(4-carboxyphenyl)benzene), which are 2-D→3-D polycatenated frameworks formed by parallel catenation of 1-D+2-D→2-D polythreaded motifs based on the double-layered sheet penetrated by ribbons of rings (1) and a 2-D→3-D mutual polythreading of three double-layered sheets with dangling arms (2), which is assembled by the same initial materials by simply changing the volume ratio of water/DMF medium. 相似文献
8.
《Journal of Coordination Chemistry》2012,65(17):1513-1523
Three new copper(II) complexes with isonicotinic acid N-oxide (HL) and 1,10-phenanthroline (phen) as ligands, [Cu(L)(phen)(H2O)]2(NO3)2···2H2O (1), [Cu(L)(phen)(H2O)]2(ClO4)2···2H2O (2), and [Cu(L)(phen)Br]2- [Cu(L)(phen)(H2O)]2Br2···6H2O (3) have been synthesized and structurally characterized. The structures of all three complexes feature a Cu2 dimer formed by two Cu(II) ions interconnected by two bridging ligands. Each copper(II) ion has a distorted square pyramidal coordination geometry with elongated axial coordination by an aqua ligand or halogen anion. The isonicotinic acid N-oxide anion is bidentate, being coordinated to two Cu(II) ions through its N-O oxygen and one of its carboxylate oxygen atoms. Magnetic susceptibility measurements show a Curie–Weiss paramagnetic behavior characteristic of one unpaired electron for a copper(II) ion for all three complexes. 相似文献
9.
D. N. Dybtsev M. P. Yutkin E. V. Peresypkina A. V. Virovets Y. Hasegawa H. Nishihara V. P. Fedin 《Russian Chemical Bulletin》2007,56(9):1782-1786
The reaction of Co(NO3)2·6H2O with 1,3,5-benzenetricarboxylic acid (H3btc, trimesic acid) in DMF at 100 °C afforded the coordination polymer [Co3(dmf)6(btc)(Hbtc)(H2btc)]··9H2O (1) (dmf is N,N′-dimethylformamide, DMF). According to the X-ray diffraction study, the metal-organic coordination polymer is composed of
planar honeycomb (6,3) networks, in which the organic benzenetricarboxylate anions and the inorganic Co2+ cations play a role of three-connected nodes. Disordered water molecules are intercalated between the layers. A study of
the magnetic properties showed the presence of a weak antiferromagnetic coupling between the Co2+ ions (S = 3/2).
Dedicated to Academician G. A. Abakumov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1719–1723, September, 2007. 相似文献
10.
The syntheses and crystal structures of four new divalent transition metal complexes of the types [Cu2(dien)2(nic)](ClO4)3 · MeOH (nic = anion of nicotinic acid; dien = diethylenetriamine), 1; [Cu(dien)(nic)]2(nic)2, 2; [Cu(dien)(nic)]2(BF4)2 · 2MeOH, 3 and [Ni(dien)(nic)(H2O)]4(NO3)4 · 2MeOH, 4, are reported, which were prepared by the reactions of diethylenetriamine and nicotinic acid with Cu(ClO4)2 · 6H2O, Cu(OAc)2 · H2O, Cu(BF4)2 · 6H2O and Ni(NO3)2 · 6H2O in MeOH, respectively. These complexes were characterized by single-crystal X-ray diffraction method and elemental analyses.
In the cation of complex 1, one nicotinate ligand bridges two Cu(II) metal centers through the pyridyl nitrogen atom and one of the carboxylate oxygen
atoms. The cations of complexes 2 and 3 form the twelve-membered metallocycles, involving two Cu(II) ions that are bridged by two nicotinate ligands. The cation
of complex 4 forms a tetranuclear cage with the four Ni(II) metal centers bridged by four nicotinate ligands and each Ni(II) metal center
adopts the distorted octahedral geometry. Their thermal properties have been investigated by using differential scanning calorimetry
(DSC) and thermogravimetric analyses (TGA). 相似文献
11.
《Journal of Coordination Chemistry》2012,65(2):125-134
Abstract The complex [Sm(H3L)(NO3)(H2O)](NO3)2 · H2O was synthesized by the (2+3) condensation of tris(2-aminoethyl)amine with 2,6-diformyl-4-chlorophenol in the presence of Sm3+. Its crystal structure has been determined. In the complex the coordination number of Sm3+ is nine. A water molecule is encapsulated in the cryptate as a guest, confirmed by electrospray mass spectrometry, thermal analysis and the X-ray crystal structure. 相似文献
12.
《Journal of Coordination Chemistry》2012,65(24):4315-4326
Two coordination polymers, {[Zn(NiL)(DMA)(H2O)2] (DMA)(H2O)} n (1) (DMA?=?N,N-dimethylacetamide) and {[Zn2(NiL)2(DMF)(H2O)4]?·?3DMF} n (2) (DMF?=?N,N-dimethylformamide), have been prepared by reactions of Zn(NO3)2?·?6H2O and NiL in CH2Cl2-DMA–H2O and CH2Cl2-DMF–H2O, respectively. H2L denotes dimethyl 5,6,7,8,15,16-hexahydro-6,7-dioxodibenzo-9,10-benzo-[1,4,8,11]tetraazacyclotetradecine-13,18-dicarboxylate. Single-crystal X-ray diffraction analyses reveal that coordination geometries around Ni(II) are identical with slightly distorted square planar and all Ni–N bonds are very short. Complex 1 shows 1-D zigzag chain structure, while 2 has 1-D double-zigzag chains. The chains, which are packed parallel in 1 and 2, are interconnected by lattice solvent through O–H···O and C–H···O hydrogen bonds to form 3-D supramolecular networks. We discuss solvent effects on assembly of the two coordination polymers. The results reveal that coordinated solvent has influence on the assembly procedure. 相似文献
13.
Annibale Giuliano Marangoni Giampaolo Pitteri Bruno Visentin Fabiano Bobbo Tatiana 《Transition Metal Chemistry》2000,25(4):485-489
The reactions of AuIII, PtII and PdII complexes with 2-pyridinecarboxaldehyde (2CHO-py) have been examined in protic (H2O, MeOH, EtOH) and aprotic (DMF, CH2Cl2) solvents. Compounds in which the pyridine ligand is N-coordinated, either in the original aldehydic form or in a new form
derived from addition of one or two protic molecules, have been isolated, namely: [Au(2CHO-py · H2O)Cl3], [Au(2CHO-py · MeOH)Cl3], [Au(2CHO-py · 2EtOH)Cl3], cis-[Pt(2CHO-py)2Cl2], trans-[Pd(2CHO-py)2Cl2], trans-[Pt(dmso)(2CHO-py)Cl2], [Pt{C5H4N-(CH2SMe)}Cl(2CHO-py)](ClO4), [Pt(terpy)(2CHOpy)](ClO4)2, [Pt(terpy)(2CHO-py · H2O)](ClO4)2 (terpy = 2,2′:6′,2′′-terpyridine). 1H-n.m.r. experiments show that the addition of the protic molecule(s) to the PtII and PdII complexes is reversible. The effects of the nature of the metal ion and the ancillary ligands as well as of the total charge
of the complexes on the relative stability of the addition products are discussed.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
14.
Daron E. Janzen Michael Juchum Shaun R. Presow Tanya K. Ronson Wolfgang Mohr Rodolphe Clérac 《Supramolecular chemistry》2016,28(1-2):125-140
Sandwich coordination complexes, [LnIII(H3L)2]X3?solvents, of Tb(III), Eu(III), Dy(III), Ho(III) and Er(III) were prepared with two new zwitterionic ester-substituted tripodal amine ligands, tris((2-hydroxy-5-n-butyl benzoate)aminoethyl)-amine (H3L1) and tris((2-hydroxy-5-methyl benzoate)aminoethyl)-amine (H3L2). These ligands were synthesised by condensation of the appropriately substituted salicylaldehyde with tris(2-aminoethyl)amine (tren) followed by in situ reduction of the tris-imine to tris-amine. Subsequent 2:1 reaction with lanthanide(III) ions yields [LnIII(H3L)2]X3?solvents (L = L1, L2; X = Cl?, NO3?; solvents = MeOH or H2O). All complexes were characterised by microanalysis, infrared spectroscopy, high resolution mass spectrometry and solid-state photoluminescence measurements. The crystal structures of [TbIII(H3L1)2]Cl3·6MeOH, [Dy(H3L1)2]Cl3·6MeOH, [EuIII(H3L1)2]Cl3·6MeOH and [TbIII(H3L1)2](NO3)3 reveal high-crystallographic ?3 symmetry at the O6-coordinated octahedral lanthanide(III) ions and that the tripodal ligands are bound in zwitterionic form: the protons from the phenolic oxygens have migrated to the amino nitrogens. Photoluminescence measurements indicate various degrees of energy transfer of the ligand chromophore to the lanthanide ions, as both ligand and lanthanide emission features are observed. Despite the high-crystallographic symmetry and the likely small transverse magnetic anisotropy of the complexes, no evidence of slow relaxation of the magnetisation, characteristic of a single-molecule magnet, was observed for [TbIII(H3L1)2]Cl3·MeOH·3H2O, [DyIII(H3L1)2]Cl3·6H2O, [HoIII(H3L1)2](NO3)3·2H2O, [ErIII(H3L1)2]·H2O and [TbIII(H3L1)2](NO3)3 down to 2.0 K. 相似文献
15.
Ram N. Patel Yogendra Singh Yogendra Pratap Singh Raymond J. Butcher 《Journal of Coordination Chemistry》2016,69(15):2377-2390
The two new nickel(II) complexes, [Ni(HL)(L)](NO3)?H2O (1) and [Ni(L)2] (2) (where HL/L = N′-[(E)-phenyl(pyridin-2-yl)methylidene]benzohydrazide), have been synthesized and characterized by elemental analysis, spectroscopic, magnetic susceptibility, and cyclic voltammetric measurements. Single-crystal X-ray analysis of [Ni(HL)(L)](NO3)?H2O (1) and [Ni(L)2] (2) has revealed the presence of a distorted octahedral geometry around nickel(II). The X-ray and spectral characterizations have confirmed the existence of the keto-enol form of the ligands in the complexes. The electronic structures and spectral properties of the ligands and the complexes have been explained by DFT and TDDFT calculations. Superoxide dismutase activity of these complexes has also been measured. 相似文献
16.
利用对乙酰氨基苯甲酸(HPABA)和邻菲咯啉(phen)、硝酸铜在DMF/CH3OH/H2O溶液中合成了单核铜配合物[Cu(PABA)(phen)(H2O)2]·(NO3)·H2O(1),然后又和4,4’-联吡啶(4,4’-bpy)、硝酸锌在DMF/CH3OH/H2O溶液中获得配位聚合物{[Zn(PABA)2(4,4’-bpy)]·4H2O}n(2)。根据X射线衍射分析结果,配合物1中每个铜离子周围有2个氮原子和3个氧原子与之配位形成畸变的四方锥配位构型,然而在配合物2中,六配位八面体构型的锌离子通过配体4,4’-联吡啶扩展为一维Zigzag型链。分别对这两个配合物的热稳定性和电化学性质进行了研究。 相似文献
17.
18.
利用对乙酰氨基苯甲酸(HPABA)和邻菲咯啉(phen)、硝酸铜在DMF/CH3OH/H2O溶液中合成了单核铜配合物[Cu(PABA)(phen)(H2O)2]·(NO3)·H2O(1),然后又和4,4′-联吡啶(4,4′-bpy)、硝酸锌在DMF/CH3OH/H2O溶液中获得配位聚合物{[Zn(PABA)2(4,4′-bpy)]·4H2O}n(2)。根据X射线衍射分析结果,配合物1中每个铜离子周围有2个氮原子和3个氧原子与之配位形成畸变的四方锥配位构型,然而在配合物2中,六配位八面体构型的锌离子通过配体4,4′-联吡啶扩展为一维Zigzag型链。分别对这两个配合物的热稳定性和电化学性质进行了研究。 相似文献
19.
Changkun Xia Yuanyuan Min Wen Sun Kai Yang Yunlong Wu 《Journal of Coordination Chemistry》2018,71(1):12-21
Two dinuclear Fe(III) metal–organic complexes with tetracarboxylate and chelating N-donor ligands, [Fe(Hbtec)(phen)(H2O)]2·2H2O (1) and [Fe(Hbtec)(bpy)(H2O)]2·2H2O (2) (H4btec = 1,2,3,5-benzenetetracarboxylic acid, phen = 1,10-phenanthroline, bpy = 2,2′-bipyridine) have been prepared and characterized by elemental analysis, IR spectroscopic, and X-ray diffraction methods. Both complexes crystallize in the monoclinic space group P21/c with two Fe(III) ions bridged by two Hbtec3? ligands into a dinuclear unit. Hydrogen bonding connects the dinuclear units into a 3-D framework. The dinuclear units are 10-connected nodes that produce a 3-D framework with topology Schläfli symbol as (312·428·55). Thermal stabilities and luminescent properties of the two complexes have also been investigated. 相似文献
20.
《Journal of Coordination Chemistry》2012,65(6):942-951
Two new complexes, trans-[MnL2(NCS)2] (1) and trans-[CoL2(H2O)(EtOH)](ClO4)2?·?H2O (2) with asymmetrical triaryltriazole ligands [L?=?3-(p-chlorophenyl)-4-(p-methylphenyl)-5-(2-pyridyl)-1,2,4-triazole], have been synthesized and characterized by elemental analysis, FT-IR, ESI-MS, and single-crystal X-ray diffraction. In the complexes each L adopts a chelating bidentate mode via the nitrogen of pyridyl and triazole. Both complexes have a similar distorted octahedral core with two NCS? ions in the trans position in 1, while one H2O and one EtOH are present in the axial sites in 2. 相似文献