Metal coordination architectures of N-acyl-salicylhydrazides: The effect of metal ions and steric repulsion of ligands to their structures of polynuclear metal complexes

Polyhedron ◽  
2009 ◽  
Vol 28 (2) ◽  
pp. 300-306 ◽  
Author(s):  
Wei Luo ◽  
Xiu-Teng Wang ◽  
Xiang-Gao Meng ◽  
Gong-Zhen Cheng ◽  
Zhen-Ping Ji
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Metal Coordination ◽  
Steric Repulsion ◽  
Polynuclear Metal Complexes

Syntheses and Structures of Homodinuclear (Na–Na) and Heterodinuclear (Cu–Na, Cu–K) Metal Complexes

2016 ◽  
Vol 69 (1) ◽  
pp. 20 ◽  
Author(s):  
Rui Jia ◽  
Ting Gao ◽  
Ruoxi Chen ◽  
Yu Yang ◽  
Po Gao ◽  
...  
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Ions ◽  
Dimensional Chain ◽  
Solid Materials ◽  
One Dimensional ◽  
X Ray ◽  
Main Group Metal ◽  
Potential Applications ◽  
Polynuclear Metal Complexes

The study of polynuclear metal complexes has gained great recognition over the last decade owing to their fascinating topological structures, various properties, and potential applications as functional solid materials in luminescence, catalysis, and magnetic materials. A large number of heterodinuclear 3d–4f and 3d–3d′ complexes have been widely studied due to their functional applications. To our knowledge, structurally characterised heterodinuclear (3d–Na, 3d–K) and homodinuclear (Na–Na) metal complexes are rare. Three metal complexes, [CuIINaI(HL1)2(SbF6)]n (1), [CuIIKI(HL1)2(PF6)]n (2), and [Na2(H2L2)2] (3), were synthesised by two kinds of ligands, o-vanillin (HL1) and N,N′-ethylene-bis(3-methoxysalicylideneimine) (H2L2). The structures of heterodinuclear complexes 1 and 2 are both one-dimensional chain structures, including transition metal ions (CuII) and main group metal ions (NaI and KI). However, the complex 3, as a homodinuclear metal complex, only has one kind of centre, a NaI ion. The structures of complexes 1–3 were determined by single crystal X-ray crystallographic studies.

Synthesis, Characterization and in vitro Biological Evaluation of a New Schiff Base Derived from Drug and its Complexes with Transition Metal Ions

2018 ◽  
Vol 69 (7) ◽  
pp. 1678-1681
Author(s):  
Amina Mumtaz ◽  
Tariq Mahmud ◽  
M. R. J. Elsegood ◽  
G. W. Weaver
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Free Ligand ◽  
Transition Metal Ions ◽  
Biological Evaluation ◽  
Pyridoxal Hydrochloride

New series of copper (II), cobalt (II), zinc (II), nickel (II), manganese (II), iron (II) complexes of a novel Schiff base were prepared by the condensation of sulphadizine and pyridoxal hydrochloride. The ligand and metal complexes were characterized by utilizing different instrumental procedures like microanalysis, thermogravimetric examination and spectroscopy. The integrated ligand and transition metal complexes were screened against various bacteria and fungus. The studies demonstrated the enhanced activity of metal complexes against reported microbes when compared with free ligand.

scholarly journals Carbonic Anhydrase Inhibitors Part 721 Synthesis and Antiglaucoma Properties of Metal Complexes of p-Fluorobenzolamide

1999 ◽  
Vol 6 (2) ◽  
pp. 67-73 ◽  
Author(s):  
Claudiu T. Supuran ◽  
Andrea Scozzafava ◽  
Luca Menabuoni ◽  
Francesco Mincione ◽  
Fabrizio Briganti ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Carbonic Anhydrase ◽  
Metal Ions ◽  
Metal Complexes ◽  
Carbonic Anhydrase Inhibitors ◽  
Physico Chemical ◽  
New Compounds

Metal complexes of a heterocyclic sulfonamides possessing very strong carbonic anhydrase (CA) inhibitory properties, i.e., 5-(p-fluorobenzenesulfonylamido)-1,3,4-thiadiazole-2-sulfonamide (p-fluorobenzolamide) were prepared. The new complexes contained metal ions such as Zn(II), Cu(II), Co(II), Ni(II), Cd(II) and Mn(II). The new compounds were characterized by standard physico-chemical procedures, and assayed as inhibitors of three CA isozymes, CA I, II and IV. Very good inhibition has been evidenced both for the parent sulfonamides as well as for the prepared complexes, against all three investigated isozymes. Some of these new complexes as well as the parent sulfonamide, strongly lowered intraocular pressure (IOP) in normotensive rabbits when administered as a 2% solution into the eye.

Radioactive Tracer Study Performed in a Dipole Geometry in a Highly Conductive Fracture Zone

1990 ◽  
Vol 212 ◽  
Author(s):  
Johan Byegård ◽  
Gunnar Skarnemark ◽  
Mats Skålberg
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Fracture Zone ◽  
Radioactive Tracer ◽  
Tracer Experiment ◽  
Tracer Study ◽  
Redox Potentials ◽  
Chemical Analogue

ABSTRACTA radioactive tracer experiment has been performed in a highly conductive fracture zone, using a dipole geometry. Anions (131I− and 82Br−) and complexed metal ions (51Cr-EDTA, 58Co-EDTA, 111In-EDTA, 140La-DOTA, 160Tb-EDTA, 169Yb-EDTA and 177Lu-DOTA) have been injected and their properties as non-sorbing tracers were evaluated. Besides, studies of slightlysorbing cations (24Na+, 58Co2+, 86Rb+ and 201T1+) were performed. 99mTcO4 and its chemical analogue 186ReO4 were also injected to study the behaviour of Tc at low redox-potentials. Breakthrough was obtained for Re and for all metal complexes and anions. Some differences in the recovery yields could be seen. No transport of cations, except for Na, could be measured. No breakthrough of Tc could be observed. This indicates that TcO4− was reduced and sorbed.

Effects of Metal Coordination Geometry on Stabilization of Human Telomeric Quadruplex DNA by Square-Planar and Square-Pyramidal Metal Complexes

2008 ◽  
Vol 47 (24) ◽  
pp. 11910-11919 ◽  
Author(s):  
Anna Arola-Arnal ◽  
Jordi Benet-Buchholz ◽  
Stephen Neidle ◽  
Ramón Vilar
Keyword(s):  
Metal Complexes ◽  
Metal Coordination ◽  
Coordination Geometry ◽  
Quadruplex Dna ◽  
Square Planar
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