Ferromagnetic Interactions in an Unusual 2D Coordination Polymer Including Di-2-pyridylketone-Methoxilated Anion, (1,1)-Azide, and Rare (1,1,3,3)-Azide Bridging Ligands

2011 ◽  
Vol 11 (5) ◽  
pp. 1458-1461 ◽  
Author(s):  
Noelia De la Pinta ◽  
Zurine Serna ◽  
Gotzon Madariaga ◽  
M. Karmele Urtiaga ◽  
M. Luz Fidalgo ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Bridging Ligands ◽  
Ferromagnetic Interactions

Magnetic Study on a Two-Dimensional Coordination Polymer with Mixed Bridging Ligands

2006 ◽  
Vol 110 (24) ◽  
pp. 7677-7681 ◽  
Author(s):  
Jing-Min Shi ◽  
You-Min Sun ◽  
Xia Zhang ◽  
Long Yi ◽  
Peng Cheng ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Magnetic Study ◽  
Two Dimensional ◽  
Bridging Ligands

catena-Poly[[di-μ2-aqua-hexaaquabis(μ3-4-oxidopyridine-2,6-dicarboxylato)trimanganese(II)] trihydrate]: a new one-dimensional coordination polymer based on a trinuclear MnIIcomplex of chelidamic acid

2013 ◽  
Vol 69 (10) ◽  
pp. 1140-1143 ◽  
Author(s):  
Masoud Mirzaei ◽  
Hossein Eshtiagh-Hosseini ◽  
Zahra Karrabi ◽  
Behrouz Notash
Keyword(s):  
Coordination Polymer ◽  
Hydrogen Bonds ◽  
Water Clusters ◽  
Repeat Unit ◽  
Three Dimensional ◽  
Pentagonal Bipyramid ◽  
Bridging Ligands ◽  
One Dimensional ◽  
Chelidamic Acid ◽  
Dimensional Network

4-Hydroxypyridine-2,6-dicarboxylic acid (chelidamic acid, hypydc[H]H2) reacts with MnCl2·2H2O in the presence of piperazine in water to afford the title complex, {[Mn3(C7H2NO5)2(H2O)8]·3H2O}nor {[Mn3(hypydc)2(H2O)8]·3H2O}n. This compound is a one-dimensional coordination polymer, with the twofold symmetric repeat unit containing three metal centres. Two different coordination geometries are observed for the two independent MnIImetal centres,viz.a distorted pentagonal bipyramid and a distorted octahedron. The 4-oxidopyridine-2,6-dicarboxylate anions and two of the water molecules act as bridging ligands. The zigzag-like geometry of the coordination polymer is stabilized by hydrogen bonds. O—H...O and C—H...O hydrogen bonds and water clusters consolidate the three-dimensional network structure.

scholarly journals Photoactivable Ruthenium-Based Coordination Polymer Nanoparticles for Light-Induced Chemotherapy

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3089
Author(s):  
Junda Zhang ◽  
Vadde Ramu ◽  
Xue-Quan Zhou ◽  
Carolina Frias ◽  
Daniel Ruiz-Molina ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
High Performance ◽  
Green Light ◽  
Fold Increase ◽  
Polymer Nanoparticles ◽  
Light Irradiation ◽  
Bridging Ligands ◽  
Monomeric Complex ◽  
First Time

Green light photoactive Ru-based coordination polymer nanoparticles (CPNs), with chemical formula [[Ru(biqbpy)]1.5(bis)](PF6)3 (biqbpy = 6,6′-bis[N-(isoquinolyl)-1-amino]-2,2′-bipyridine; bis = bis(imidazol-1-yl)-hexane), were obtained through polymerization of the trans-[Ru(biqbpy)(dmso)Cl]Cl complex (Complex 1) and bis bridging ligands. The as-synthesized CPNs (50 ± 12 nm diameter) showed high colloidal and chemical stability in physiological solutions. The axial bis(imidazole) ligands coordinated to the ruthenium center were photosubstituted by water upon light irradiation in aqueous medium to generate the aqueous substituted and active ruthenium complexes. The UV-Vis spectral variations observed for the suspension upon irradiation corroborated the photoactivation of the CPNs, while High Performance Liquid Chromatography (HPLC) of irradiated particles in physiological media allowed for the first time precisely quantifying the amount of photoreleased complex from the polymeric material. In vitro studies with A431 and A549 cancer cell lines revealed an 11-fold increased uptake for the nanoparticles compared to the monomeric complex [Ru(biqbpy)(N-methylimidazole)2](PF6)2 (Complex 2). After irradiation (520 nm, 39.3 J/cm2), the CPNs yielded up to a two-fold increase in cytotoxicity compared to the same CPNs kept in the dark, indicating a selective effect by light irradiation. Meanwhile, the absence of 1O2 production from both nanostructured and monomeric prodrugs concluded that light-induced cell death is not caused by a photodynamic effect but rather by photoactivated chemotherapy.

scholarly journals Poly[tris{μ-2-[(dimethylamino)methyl]imidazolato-κ3 N 1,N 2:N 3}(nitrato-κO)dizinc(II)]

IUCrData ◽  
2016 ◽  
Vol 1 (10) ◽  
Author(s):  
Takahiro Kuramoto ◽  
Masaaki Sadakiyo ◽  
Miho Yamauchi
Keyword(s):  
Coordination Polymer ◽  
Three Dimensional ◽  
Chain Structure ◽  
Helical Chain ◽  
Nitrate Anion ◽  
Framework Structure ◽  
Bridging Ligands ◽  
Nitrate Ion ◽  
Nitrate Ions ◽  
Anionic Ligands

In the title coordination polymer, [Zn2(C6H10N3)3(NO3)] n , two independent ZnII ions are tetrahedrally coordinated by the anionic ligands, viz. 2-[(dimethylamino)methyl]imidazolate or nitrate ions. One ZnII ion is coordinated by the imidazolate N atoms of three anions and an O atom of the nitrate ion. The second ZnII ion is coordinated by imidazolate N atoms of three anions and one amino N atom of one such ligand. The 2-[(dimethylamino)methyl]imidazolate anions are bridging the ZnII ions to form a helical chain structure along [001]. The chains are further linked by the bridging ligands into a three-dimensional framework structure. The nitrate anion is disordered over two sets of sites and was refined with two pairs of three O atoms using half-occupancy for each O atom.

scholarly journals Ferromagnetism in polynuclear systems based on non-linear [MnII2MnIII] building blocks

2016 ◽  
Vol 3 (10) ◽  
pp. 1272-1279 ◽  
Author(s):  
Jordi Cirera ◽  
Yuan Jiang ◽  
Lei Qin ◽  
Yan-Zhen Zheng ◽  
Guanghua Li ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
High Spin ◽  
Transition Metal Complexes ◽  
Building Blocks ◽  
Bridging Ligands ◽  
Non Linear ◽  
Important Challenge ◽  
Ferromagnetic Interactions

Design of new polynuclear transition metal complexes showing ferromagnetic interactions to achieve high spin values is an important challenge due to the scarcity of bridging ligands that provide such coupling.

scholarly journals How to Make a Better Magnet? Insertion of Additional Bridging Ligands into a Magnetic Coordination Polymer

2018 ◽  
Vol 4 (3) ◽  
pp. 41
Author(s):  
Gabriela Handzlik ◽  
Dawid Pinkowicz
Keyword(s):  
Coordination Polymer ◽  
Self Assembly ◽  
Magnetic Hysteresis ◽  
Three Dimensional ◽  
Magnetic Ordering ◽  
Magnetic Interaction ◽  
Magnetic Hysteresis Loop ◽  
Water Molecules ◽  
Crystallization Water ◽  
Bridging Ligands

A three-dimensional cyanide-bridged coordination polymer based on FeII (S = 2) and NbIV (S = 1/2) {[FeII(H2O)2]2[NbIV(CN)8]·4H2O}n (Fe2Nb) was modified at the self-assembly stage by inserting an additional formate HCOO− bridge into its cyanide framework. The resulting mixed-bridged {(NH4)[(H2O)FeII-(μ-HCOO)-FeII(H2O)][NbIV(CN)8]·3H2O}n (Fe2NbHCOO) exhibited additional FeII-HCOO-FeII structural motifs connecting each of the two FeII centers. The insertion of HCOO− was possible due to the substitution of some of the aqua ligands and crystallization water molecules in the parent framework by formate anions and ammonium cations. The formate molecular bridge not only shortened the distance between FeII ions in Fe2NbHCOO from 6.609 Å to 6.141 Å, but also created additional magnetic interaction pathways between the magnetic centers, resulting in an increase in the long range magnetic ordering temperature from 43 K for Fe2Nb to 58 K. The mixed-bridged Fe2NbHCOO also showed a much broader magnetic hysteresis loop of 0.102 T, compared to 0.013 T for Fe2Nb.

A 2D Thiocyanato-Bridged Copper(II)-Manganese(II) Bimetallic Coordination Polymer with Ferromagnetic Interactions

2005 ◽  
Vol 2005 (1) ◽  
pp. 55-58 ◽  
Author(s):  
Jing-Min Shi ◽  
Wei Xu ◽  
Bin Zhao ◽  
Peng Cheng ◽  
Dai-Zheng Liao ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Ferromagnetic Interactions
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