Flexible N-Donor Ligands Direct the Structural Characteristics of CoII Complexes: Syntheses, Structures, and Magnetic Properties

2019 ◽  
Vol 72 (5) ◽  
pp. 341 ◽  
Author(s):  
Yu-Ting Yang ◽  
Chang-Zheng Tu ◽  
Xiao-Lin Xu ◽  
Li-Li Xu ◽  
Bang-Ling Yan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coordination Polymers ◽  
Structural Characteristics ◽  
Donor Ligands ◽  
X Ray Diffraction ◽  
Thermal Stabilities ◽  
Ancillary Ligands ◽  
X Ray ◽  
Elemental Analyses ◽  
Bilayered Structure

Solvothermal reactions of 3,3′,5,5′-biphenyltetracarboxylic acid (H4BPTC) and cobalt(ii) ions in the presence of two different flexible N-donor ancillary ligands afford two novel coordination polymers, {[Co(BPTC)0.5(bix)]·H2O}n (1), {[Co(BPTC)0.5(bpp)]·3H2O}n (2) (bix=1,4-bis(imidazol-1-ylmethyl)benzene; bpp=1,3-bis(4-pyridyl)propane). Their structures have been determined by elemental analyses, IR spectra, single-crystal X-ray diffraction analyses, and powder X-ray diffraction. The pillared layered framework of 1 can be simplified to a (4,6)-connected net with a Schläfli symbol of (44·62)(44·69·82). Complex 2 manifests a bilayered structure, and can be simplified to a (4,4)-connected net with a Schläfli symbol of (55·8)(54·62). The thermal stabilities of both complexes and the magnetic behaviours of 1 are also discussed.

Syntheses, structures and magnetic properties of two CoII/NiII isostructural coordination polymers based on an asymmetric semirigid tricarboxylate ligand

2022 ◽  
Vol 78 (1) ◽  
Author(s):  
Shao-Dong Li ◽  
Feng Su ◽  
Cheng-Yong Zhou ◽  
Qi-Long Hu ◽  
Ya-Qi Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Thermogravimetric Analyses ◽  
X Ray ◽  
Elemental Analyses

Two new isostructural complexes, namely, poly[aqua[μ3-2-(4-carboxyphenoxy)terephthalato-κ3 O 1:O 4:O 4′](1,10-phenanthroline-κ2 N,N′)cobalt(II)], [Co(C15H8O7)(C12H8N2)(H2O)] n or [Co(μ3-Hcpota)(phen)(H2O)] n , I, and poly[aqua[μ3-2-(4-carboxyphenoxy)terephthalato-κ3 O 1:O 4:O 4′](1,10-phenanthroline-κ2 N,N′)nickel(II)], [Ni(C15H8O7)(C12H8N2)(H2O)] n or [Ni(μ3-Hcpota)(phen)(H2O)] n , II, have been synthesized by solvothermal reactions. Complexes I and II were fully characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses, and powder and single-crystal X-ray diffraction. They both present two-dimensional structures based on [M 2(μ-COO)2]2+ (M = CoII or NiII) dinuclear metal units with a fes topology and a vertex symbol (4·82). Interestingly, the positions of the two dimeric metal motifs and the two partially deprotonated Hcpota2− ligands reproduce regular flying butterfly arrangements flipped upside down and sharing wings in the ab plane. Magnetic studies indicate antiferromagnetic interactions (J = −5.21 cm−1 for I and −11.53 cm−1 for II) in the dimeric units, with Co...Co and Ni...Ni distances of 4.397 (1) and 4.358 (1) Å, respectively, that are related to double syn–anti carboxylate bridges.

Two CoII coordination polymers of biphenyl-2,2′,5,5′-tetracarboxylic acid with flexible N-donor ligands: syntheses, structures and magnetic properties

2019 ◽  
Vol 75 (8) ◽  
pp. 1073-1083 ◽  
Author(s):  
Feng Su ◽  
Cheng-Yong Zhou ◽  
Lin-Tao Wu ◽  
Xi Wu ◽  
Jing Su ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Three Dimensional ◽  
Donor Ligands ◽  
Tetracarboxylic Acid ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Orbital Contribution ◽  
X Ray ◽  
3D Network ◽  
Methyl Benzene

Two CoII-based coordination polymers, namely poly[(μ4-biphenyl-2,2′,5,5′-tetracarboxylato){μ2-1,3-bis[(1H-imidazol-1-yl)methyl]benzene}dicobalt(II)], [Co2(C16H6O8)(C14H14N4)2] n or [Co2(o,m-bpta)(1,3-bimb)2] n (I), and poly[[aqua(μ4-biphenyl-2,2′,5,5′-tetracarboxylato){1,4-bis[(1H-imidazol-1-yl)methyl]benzene}dicobalt(II)] dihydrate], {[Co2(C16H6O8)(C14H14N4)2(H2O)2]·4H2O} n or {[Co2(o,m-bpta)(1,4-bimb)2(H2O)2]·4H2O} n (II), were synthesized from a mixture of biphenyl-2,2′,5,5′-tetracarboxylic acid, i.e. [H4(o,m-bpta)], CoCl2·6H2O and N-donor ligands under solvothermal conditions. The complexes were characterized by IR spectroscopy, elemental analysis, single-crystal X-ray diffraction and powder X-ray diffraction analysis. The bridging (o,m-bpta)4− ligands combine with CoII ions in different μ4-coordination modes, leading to the formation of one-dimensional chains. The central CoII atoms display tetrahedral [CoN2O2] and octahedral [CoN2O4] geometries in I and II, respectively. The bis[(1H-imidazol-1-yl)methyl]benzene (bimb) ligands adopt trans or cis conformations to connect CoII ions, thus forming two three-dimensional (3D) networks. Complex I shows a (2,4)-connected 3D network with left- and right-handed helical chains constructed by (o,m-bpta)4− ligands. Complex II is a (4,4)-connected 3D novel network with ribbon-like chains formed by (o,m-bpta)4− linkers. Magnetic studies indicate an orbital contribution to the magnetic moment of I and II due to the longer Co...Co distances. An attempt has been made to fit the χM T results to the magnetic formulae for mononuclear CoII complexes, the fitting indicating the presence of weak antiferromagnetic interactions between the CoII ions.

scholarly journals Long Time Stability Investigation for Structural and Magnetic Properties of Ti-doped Barium Ferrite

2019 ◽  
Vol 3 (2) ◽  
pp. 53-57
Author(s):  
Mohammed Abdul Malek Al Saadi
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Structural Characteristics ◽  
Barium Hexaferrite ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Storage Process ◽  
X Ray ◽  
Air Atmosphere ◽  
Long Time

Barium hexaferrite (BHF) (BaFe12O19) and its substituted derivatives have been considered as the most potential magnetic candidates with considerable chemical stability and physiochemical characteristics. BHF with x ferrite ions substituted by titanium (Ti-doped BTHF) (BaTixFe12-xO19) (x=1 and x=3) was prepared from ferric oxide (Fe2O3), barium oxide (BaO), and titanium oxide (TiO2) of purity >98%. The materials were mixed with deionized water and then dried at 1100°C and 1200°C overnight. For the formation of BaFe12O19 phase, the mixture was annealed at a rate of 10°C/min in static air atmosphere until reaching 1200°C and then maintained for 10 h. Structural properties of these samples were measured using X-ray diffraction (XRD) and scanning electron microscopy, while magnetic properties were measured using vibrating sample magnetometer (VSM) device. Magnetic and structural characteristics are investigated after preserving Ti-doped BHF samples at room temperature and ambient conditions for 12 years. The samples are characterized using the same previous techniques to find out the possible effect of long period storage on their properties. The results showed that the storage process has little effect on these properties where the granular size increased due to increased oxidation. XRD tests also showed the absence of Ti at low ratios due to increased oxidation of ferrite. VSM results showed increased magnetic properties after storage due to increased iron oxide.

Hydrothermal synthesis, crystal structure and photoluminescence of two homochiral zinc(II) coordination polymers

2015 ◽  
Vol 71 (7) ◽  
pp. 618-622 ◽  
Author(s):  
Shao-Ming Ying ◽  
Jing-Jing Ru ◽  
Wu-Kui Luo
Keyword(s):  
Crystal Structure ◽  
Coordination Polymers ◽  
Layer Structure ◽  
Metal Organic Frameworks ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Strong Emission ◽  
X Ray ◽  
Elemental Analyses ◽  
Metal Organic

Metal–organic frameworks (MOFs) have potentially useful applications and an intriguing variety of architectures and topologies. Two homochiral coordination polymers have been synthesized by the hydrothermal method, namely poly[(μ-N-benzyl-L-phenylalaninato-κ4O,O′:O,N)(μ-formato-κ2O:O′)zinc(II)], [Zn(C16H16NO2)(HCOO)]n, (1), and poly[(μ-N-benzyl-L-leucinato-κ4O,O′:O,N)(μ-formato-κ2O:O′)zinc(II)], [Zn(C13H18NO2)(HCOO)]n, (2), and studied by single-crystal X-ray diffraction, elemental analyses, IR spectroscopy and fluorescence spectroscopy. Compounds (1) and (2) each have a two-dimensional layer structure, with the benzyl or isobutyl groups of the ligands directed towards the interlayer interface. Photoluminescence investigations show that both (1) and (2) display a strong emission in the blue region.

Synthesis and structural characterization of two coordination polymers constructed by bis(4-(1H-imidazol-1-yl)phenyl)methanone and 5-(tert-butyl)isophthalate ligands

2019 ◽  
Vol 74 (3) ◽  
pp. 261-265 ◽  
Author(s):  
Gao-Feng Wang ◽  
Shu-Wen Sun ◽  
Wei-Bing Wang ◽  
Hong Sun ◽  
Shao-Fei Song
Keyword(s):  
Single Crystal ◽  
Coordination Polymers ◽  
Weak Interactions ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Network ◽  
Elemental Analyses ◽  
Solvothermal Methods

AbstractTwo coordination polymers, {[Co(bipmo)(tbip)]·3H2O}n (1) and {[Cd(bipmo)(tbip)]·3H2O}n (2) (bipmo=bis(4-(1H-imidazol-1-yl)phenyl)methanone, H2tbip=5-tert-butylisophthalic acid), were synthesized by solvothermal methods and structurally characterized by elemental analyses, infrared spectroscopy, and single-crystal X-ray diffraction. The results from single-crystal X-ray diffraction data indicate that the solid state structures of 1 and 2 consist of metal-aromatic carboxylate layers, which are pillared by weak interactions to generate a three-dimensional network. The topological structures of 1 and 2 are uninodal nets based on 3-connected nodes with the Schläfli symbol of {63}.

Linear alkaline earth metal phosphinate coordination polymers: synthesis and structural characterization

2014 ◽  
Vol 70 (3) ◽  
pp. 602-607 ◽  
Author(s):  
Jeffrey A. Rood ◽  
Ashley L. Huttenstine ◽  
Zachery A. Schmidt ◽  
Michael R. White ◽  
Allen G. Oliver
Keyword(s):  
Coordination Polymers ◽  
Alkaline Earth ◽  
Linear Chain ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Elemental Analyses ◽  
Ft Ir

Reaction of alkaline earth metal salts with diphenylphosphinic acid in dimethylformamide solvent afforded four coordination polymers: [Mg3(O2PPh2)6(DMF)2]·2DMF (I), [Ca(O2PPh2)2(DMF)2] (II), [Sr(O2PPh2)2(DMF)2] (III) and [Ba(O2PPh2)2(DMF)2] (IV) (where DMF isN,N-dimethylformamide). Single-crystal X-ray diffraction revealed that all four compounds produce linear chain structures in the solid state, with the Ca, Sr and Ba forming isostructural crystals. The bulk materials were characterized by FT–IR and1H NMR spectroscopy and elemental analyses.

Synthesis, crystal structures and characterizations of two homochiral coordination polymers based on a chiral reduced Schiff base ligand

2014 ◽  
Vol 70 (4) ◽  
pp. 375-378 ◽  
Author(s):  
Shao-Ming Ying ◽  
Xiao-Hui Huang ◽  
Wu-Kui Luo ◽  
Yan-Chun Xiao
Keyword(s):  
Schiff Base ◽  
Coordination Polymers ◽  
Schiff Base Ligand ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Strong Emission ◽  
X Ray ◽  
Dimensional Network ◽  
Elemental Analyses ◽  
Reduced Schiff Base

Two homochiral coordination polymers based on a chiral reduced Schiff base ligand, namely poly[(μ5-4-{[(NR,1S)-(1-carboxylato-2-phenylethyl)amino]methyl}benzoato)zinc(II)], [Zn(C17H15NO4)]n, (1), and poly[(μ5-4-{[(NR,1S)-(1-carboxylato-2-phenylethyl)amino]methyl}benzoato)cobalt(II)], [Co(C17H15NO4)]n, (2), have been obtained by hydrothermal methods and studied by single-crystal X-ray diffraction, elemental analyses, powder X-ray diffraction, thermogravimetric analysis, IR spectroscopy and fluorescence spectroscopy. Compounds (1) and (2) are isostructural and crystallize in theP212121space group. Both display a three-dimensional network structure with a one-dimensional channel, with the benzyl group of the ligand directed towards the channel. An investigation of photoluminescence properties shows that compound (1) displays a strong emission in the purple region.

scholarly journals Two Interpenetrated Zn(II) Coordination Polymers: Synthesis, Topological Structures, and Property

Crystals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 601 ◽  
Author(s):  
Zi-Wei He ◽  
Chang-Jie Liu ◽  
Wei-Dong Li ◽  
Shuai-Shuai Han ◽  
Shui-Sheng Chen
Keyword(s):  
Fourier Transform ◽  
Coordination Polymers ◽  
Zinc Sulfate ◽  
Diffuse Reflectance ◽  
Donor Ligands ◽  
X Ray Diffraction ◽  
Sulfate Heptahydrate ◽  
X Ray ◽  
Layer Structures ◽  
3D Architecture

Two interpenetrated coordination polymers (CPs) {[Zn1(L)(NO2pbda)]n[Zn2(L)(NO2pbda)]n} (1) and [Zn(L)(Brpbda)]n (2) were prepared by reactions of zinc sulfate heptahydrate with N-donor ligands of 1,4-di(1H-imidazol-4-yl)benzene (L) and auxiliary carboxylic acids of nitroterephthalic acid (H2NO2pbda) and 2,5-dibromoterephthalic acid (H2Brpbda), respectively. The structures of the CPs were characterized by Fourier-Transform Infrared (IR) spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The coordination polymer 1 has two different (4, 4) sql 2D layer structures based on the [Zn(L)(NO2pbda)] moiety, which results in inclined interpenetration with a 2D + 2D → 3D architecture, while the CP 2 exhibits a 3-fold interpenetrating dmp network. The diffuse reflectance spectra are also investigated for the CPs 1 and 2.

Syntheses, crystal structures, and characterization of two Mn(II) coordination polymers with bis(4-(1H-imidazol-1-yl)phenyl)methanone ligands

2016 ◽  
Vol 71 (8) ◽  
pp. 869-874 ◽  
Author(s):  
Gao-Feng Wang ◽  
Xiao Zhang ◽  
Shu-Wen Sun ◽  
Hong Sun ◽  
Xia Yang ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Octahedral ◽  
Elemental Analyses

AbstractTwo Mn(II) complexes, {[Mn(BIPMO)2Cl2] · 2(H2O)}n (1) and {[Mn(BIPMO)2(SCN)2] · 2(CH3OH)}n (2) (BIPMO = bis(4-(1H-imidazol-1-yl)phenyl)methanone) with V-shaped BIPMO ligands, were synthesized and characterized by IR spectroscopy and elemental analyses along with their single-crystal X-ray diffraction analyses. The Mn(II) ions in 1 and 2 are both six-coordinated to four nitrogen atoms of four BIPMO ligands and two anions (Cl− for 1, and SCN− for 2) to form a distorted octahedral geometry.

Syntheses and structural characterization of manganese and cadmium coordination polymers constructed with bis(4-(1H-imidazol-1-yl)phenyl)methanone and dicarboxylate ligands

2020 ◽  
Vol 75 (9-10) ◽  
pp. 859-863
Author(s):  
Gao-Feng Wang ◽  
Shu-Wen Sun ◽  
Hong Sun ◽  
Bing-Wei Chang ◽  
Jing Song ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Coordination Polymers ◽  
Structural Characterization ◽  
Topological Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Elemental Analyses ◽  
Butanedioic Acid ◽  
Solvothermal Methods

AbstractTwo coordination polymers (CPs), [Mn(bipmo)(pbtda)(H2O)]n (1), {[Cd(bipmo)(btda)]·2(H2O)]}n (2), (bipmo = bis(4-(1H-imidazol-1-yl)phenyl)methanone, H2pbtda = 2-phenylbutanedioic acid, H2btda = butanedioic acid), were synthesized by solvothermal methods. The products have been characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The topological structure of 1 is based on 2-nodal nets with the Schläfli symbol {63}{69·8}, while that of 2 features a system with a sixfold penetration with the Schläfli symbol {66}.

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