scholarly journals Cu(II) complexes with a pendant octaazamacrocycle and µ-bonded aromatic carboxylates

2002 ◽  
Vol 67 (10) ◽  
pp. 677-684 ◽  
Author(s):  
Gordana Vuckovic ◽  
Mirjana Antonijevic ◽  
Dejan Poleti
Keyword(s):  
Crystal Structure ◽  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Phthalic Acid ◽  
Magnetic Measurements ◽  
Isophthalic Acid ◽  
Mixed Ligand ◽  
The Third ◽  
Aromatic Carboxylates

Three new cationic mixed-ligand Cu(II) complexes with N,N?,N??,N???-tetrakis(2-pyridylmethyl)- 1,4,8,11-tetraazacyclotetradecane (tpmc) and bridging aromatic mono- or dicarboxylate ligands were prepared. Elemental analysis, conductometric and magnetic measurements, as well as electronic and IR spectroscopy were employed for their characteriization. It is proposed that the complexes [Cu2(C6H5COO)tpmc](CIO4)3MeOH and [Cu2(Hpht)tpmc](CIO4). 3H2O(H2pht=phthalic acid) are binuclear with ?-coordination of the carboxylate monoanions. The third complex [Cu4ipht(tpmc)2](CIO4)6NaClO42MeCN (H2ipht=isophthalic acid) is one of the rare tetranuclear Cu(II)-tpmc complexes with an aromatic dicarboxylate ion bridging two Cu2tpmc units. This was also confirmed by preliminary results of the determination of the crystal structure.

Determination of the charge of Al13 Keggin oligocations intercalated into synthetic hectorite

2019 ◽  
Vol 74 (1) ◽  
pp. 85-90
Author(s):  
Marius Schöttle ◽  
Dominik Schuchardt ◽  
Andreas Edenharter ◽  
Sebastian Koch ◽  
Jürgen Senker ◽  
...  
Keyword(s):  
Reaction Time ◽  
Solid State ◽  
Ir Spectroscopy ◽  
Cation Exchange ◽  
Elemental Analysis ◽  
Crystalline Phase ◽  
Solid State Nmr ◽  
Liquid Crystalline ◽  
A Charge

AbstractApplying a nematic liquid crystalline phase of a synthetic Na-hectorite with layer separations >100 nm, the reaction time for pillaring with Al13 Keggin oligocation could be reduced to seconds ensuring that cation exchange is controlled by thermodynamics. With this material at hand we are able to resolve the long-standing dispute regarding the charge of intercalated Keggin oligocations. Micropore sizes as determined by physisorption isotherms, adsorption isotherms obtained via elemental analysis, and results of 27Al solid-state NMR and pyridine probe IR spectroscopy favor a charge of +7 for the Al13 pillars intercalated into hectorite unaltered.

Serendipity: Werner's argument that the `two-only forms' (green and violet) of [CoCl2(en)2]+ salts demanded his octahedral model was correct. True?

2020 ◽  
Vol 76 (3) ◽  
pp. 298-301 ◽  
Author(s):  
Ivan Bernal ◽  
Roger A. Lalancette
Keyword(s):  
Crystal Structure ◽  
Elemental Composition ◽  
19Th Century ◽  
Elemental Analysis ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Late 19Th Century ◽  
X Ray ◽  
The Third ◽  
Alfred Werner

Chemists of the late 19th century, including Alfred Werner, prepared salts containing either green or violet cations of composition [CoCl2(en)2]+ (en is ethylenediamine, C2H8N2); we now refer to these as trans-dichloro and cis-dichloro species. We have discovered a third salt, purple in color, containing cations of the same elemental composition and whose asymmetric unit composition is [CoCl2(en)2]2Cl2·3H2O, in which the cobalt cations are a cis:trans dichloro pair. Such a discovery would undermine Werner's argument that if only two forms can be prepared, his octahedral theory was proven. Probably because his students never examined their crystals under a microscope, they failed to observe the `third' species, thereby ruining Werner's argument since he relied strictly on color to identify them. That was fortunate since our purple salt would have led him to abandon, or certainly delay, his momentous discovery. Our crystals consist of a 1:1 mixture of the cis and trans cations, thereby sharing the same elemental analysis and conductivity as the single salts, but not their crystal structure, inasmuch as X-ray diffraction had not even been discovered then. Serendipitously, our discovery would have been a great boon to his theoretical acumen, while his `two-color' argument may have doomed him.

A Three-Dimensional Silver(I) Framework Assembled from Nitrilotriacetate

2005 ◽  
Vol 58 (2) ◽  
pp. 115 ◽  
Author(s):  
Chun-Long Chen ◽  
Qian Zhang ◽  
Ji-Jun Jiang ◽  
Qin Wang ◽  
Cheng-Yong Su
Keyword(s):  
Crystal Structure ◽  
Ir Spectroscopy ◽  
Coordination Polymer ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Three Dimensional ◽  
Single Crystal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Numbers

The reaction of AgCF3CO2 with nitrilotriacetate (NTA) yields the three-dimensional silver(i) coordination polymer {Ag3[N(CH2COO)3]}n 1 which was characterized by means of elemental analysis and IR spectroscopy as well as X-ray diffraction. The single crystal structure shows that the NTA3– anions act as unusual heptadentate 13-coordination agents and the silver(i) atoms exhibit various coordination numbers in the range 3–6.

A Gallium-Nitrogen Heteronorbornane With Bulky Tbutyl Substituents

2005 ◽  
Vol 60 (3) ◽  
pp. 243-246 ◽  
Author(s):  
Xin Tiana ◽  
Roland Fröhlich ◽  
Norbert W. Mitzela
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Elemental Analysis ◽  
Simultaneous Formation ◽  
Nitrogen Bonds ◽  
Selective Formation

Selective formation of 3,3,6,6-tetra-tbutyl-1,4-dimethyl-3,6-digallium-1,4-diaza-norborane is achieved by the reaction of bis(lithiomethyl-methylamino)methane with ditbutylgallium chloride by simultaneous formation of two dative metal-carbon and two metal-nitrogen bonds accompanied by two ring closures. Despite the high steric demand of the tbutyl groups, the norbornane-like structure is favoured over potential isomers containing three-membered rings and over polymeric aggregation. The compound was identified by elemental analysis, NMR spectroscopy (1H, 13C) and by determination of its crystal structure in which it is present as a monomer

scholarly journals Crystal structure of an oxalate-bridged tetranuclear 8-hydroxyquinoline Zn(II) cluster: [Zn4Q6(Ox)]0.5n

2011 ◽  
Vol 76 (4) ◽  
pp. 529-537 ◽  
Author(s):  
Jiajun Wang ◽  
Qiang Wang ◽  
Yanjun Sun ◽  
Yuemei Wang ◽  
Guosheng Zhao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Chain Structure ◽  
Stacking Interactions ◽  
Monoclinic System ◽  
X Ray ◽  
X Ray Crystallography ◽  
Polymeric Chains

The chain structure of a tetranuclear zinc(II) cluster [Zn4Q6(Ox)]0.5n ([Zn4 (C9H6NO)6(C2O4)]0.5n) (1) (Q = 8- hydroxyquinoline anion, Ox = oxalate dianion) was determined by X-ray crystallography and characterized by elemental analysis, IR spectroscopy and thermal analysis. It crystallizes in the monoclinic system, space group P21/n (No. 14), with the lattice parameters a = 13.2222(15) ?, b = 11.0566(12) ?, c = 16.2224(18) ?, ? = 92.1770(10)?, V = 2369.9(5) ?3, Z = 4, Mr = 607.23 g mol-1, Dc = 1.702 g cm-3. The tetranuclear zinc(II) clusters form 1D polymeric chains parallel to the b-axis. The ?-? stacking interactions involving aryl rings support the formation of the 1D polymeric structure. The neighboring polymeric chains are connected by C-H???? interactions.

scholarly journals Synthesis, Characterization and Antibacterial Studies of the Mixed Ligand Complexes of Pd(II) and Pt(II) Ions with Phthalic Acid and Heterocyclic Amines

2015 ◽  
Vol 17 (2) ◽  
pp. 157-162
Author(s):  
Md Belayet Hossain ◽  
Md Abdus Salam ◽  
Abdur Rashed ◽  
MA Yousuf
Keyword(s):  
Metal Ion ◽  
Phthalic Acid ◽  
Pathogenic Bacteria ◽  
Magnetic Measurements ◽  
Spectroscopic Studies ◽  
Mixed Ligand ◽  
Bacterial Activity ◽  
Heterocyclic Amines ◽  
Mixed Ligand Complexes ◽  
Diffusion Method

Mixed ligand complexes of Pd(II) and Pt(II) ions with phthalic acid and heterocyclic amines were synthesized and characterized. The general formula of the complexes is [MLL/]; where, M = Pd(II)(1-2), Pt(II)(3); L = phthalate, C8H4O4, L/ = pyridine, C5H5N(1); 2-aminopyridine, C5H6N2(2) and 4-picoline, C6H7N(3). The complexes were synthesized in the solid form and characterized by elemental analysis, electrical conductivity, magnetic measurements, and spectroscopic studies. Spectral analyses and magnetic measurements revealed the coordination of metal ion with ligands and geometry of the complexes. Anti-bacterial activity of the complexes against seven pathogenic bacteria (three gram positive and four gram negative) was assessed by the disc diffusion method. Complexes [Pd(Ph)(2-apy)] and [Pt(Ph)(4-pico)2] showed the highest anti-bacterial activity (when, Ph = bidentate phthalate, 2-apy = 2-aminopyridine and 4-pico = 4-picoline). DOI: http://dx.doi.org/10.3329/bpj.v17i2.22333 Bangladesh Pharmaceutical Journal 17(2): 157-162, 2014

scholarly journals DNA Binding Test, X-Ray Crystal Structure, Spectral Studies, TG-DTA, and Electrochemistry of [CoX2(dmdphphen)] (Dmdphphen Is 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline, X = Cl, and NCS) Complexes

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Mousa Al-Noaimi ◽  
Mohammed Suleiman ◽  
Hany W. Darwish ◽  
Ahmed H. Bakheit ◽  
Muneer Abdoh ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Cyclic Voltammetry ◽  
Elemental Analysis ◽  
Mixed Ligand ◽  
Spectral Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tetrahedral Environment ◽  
One Step ◽  
Ct Dna

Two new neutral mixed-ligand cobalt(II) complexes, [CoCl2(dmdphphen)]1and [Co(NCS)2(dmdphphen)]  2, where dmdphphen is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, were synthesized and characterized by an elemental analysis, UV-Vis, IR, TG/DTA, cyclic voltammetry CV, and single X-ray diffraction. Complex2crystallized as monoclinic with a space group P21/c. Co(II) ions are located in a distorted tetrahedral environment. TG/DTA result shows that these complexes are very stable and decomposed through one-step reaction. The two complexes exhibit a quasireversible one-electron response at −550 and 580 mV versus Cp2Fe/Cp2Fe+, which has been assigned to Co(I)/Co(II) and Co(II)/Co(III) couples. Absorption spectral studies reveal that such complexes exhibit hypochromicity during their interaction with CT-DNA.

Electronic Structures of Bent, Formally Two-Coordinate Lanthanide(III) Cations

2019 ◽  
Author(s):  
David Mills ◽  
Hannah Nicholas ◽  
Michele Vonci ◽  
Conrad Goodwin ◽  
Richard Winpenny ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ab Initio Calculations ◽  
Single Crystal ◽  
Ab Initio ◽  
Elemental Analysis ◽  
Electronic Structures ◽  
Magnetic Measurements ◽  
Single Crystal Xrd ◽  
Multinuclear Nmr

<p>Synthesis of bent, formally two-coordinate lanthanide(III) cations. Characterization by multinuclear NMR, EPR, UV/Vis/NIR and ATR-IR spectroscopy, single crystal XRD, magnetic measurements, elemental analysis and ab initio calculations. <b></b></p>

Electronic Structures of Bent, Formally Two-Coordinate Lanthanide(III) Cations

2019 ◽  
Author(s):  
David Mills ◽  
Hannah Nicholas ◽  
Michele Vonci ◽  
Conrad Goodwin ◽  
Richard Winpenny ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Ab Initio Calculations ◽  
Single Crystal ◽  
Ab Initio ◽  
Elemental Analysis ◽  
Electronic Structures ◽  
Magnetic Measurements ◽  
Single Crystal Xrd ◽  
Multinuclear Nmr

<p>Synthesis of bent, formally two-coordinate lanthanide(III) cations. Characterization by multinuclear NMR, EPR, UV/Vis/NIR and ATR-IR spectroscopy, single crystal XRD, magnetic measurements, elemental analysis and ab initio calculations. <b></b></p>

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