Coordination complexes of functionalized pyrazines with metal ions: reagents for the controlled release of flavourant molecules at elevated temperatures

2006 ◽  
Vol 21 (2) ◽  
pp. 202-206 ◽  
Author(s):  
Colin Baillie ◽  
Jamie F. Bickley ◽  
Peter Branton ◽  
James Chadwick ◽  
Peter Wan ◽  
...  
Keyword(s):  
Controlled Release ◽  
Metal Ions ◽  
Elevated Temperatures ◽  
Coordination Complexes

Manganese(II), lead(II) and cadmium(II) coordination complexes containing a tetrazole-based acylamide ligand: synthesis and the influence of the metal ions on the structures

2018 ◽  
Vol 74 (2) ◽  
pp. 139-145
Author(s):  
Xiao-Ying Lin ◽  
Qin-Qin Zheng ◽  
Ling-Zhu Gong ◽  
Ya-Min Liu ◽  
Min-Yi Liu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Mixed Solvent ◽  
Three Dimensional ◽  
Building Blocks ◽  
Solvent System ◽  
Coordination Complexes ◽  
Divalent Metal ◽  
Metal Salts ◽  
Mixed Solvent System ◽  
Intermolecular Hydrogen Bonds

Three new manganese(II), lead(II) and cadmium(II) coordination complexes have been prepared by reaction of N-(1H-tetrazol-5-yl)cinnamamide (HNTCA) with divalent metal salts (MnCl2, PbCl2 and CdCl2) in a mixed-solvent system, affording mononuclear to trinuclear structures namely, bis(methanol-κO)bis[5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido-κ2 N 1,O]manganese(II), [Mn(C10H8N5O)2(CH3OH)2], (1), bis[μ-5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido]-κ3 N 1,O:N 2;κ3 N 2:N 1,O-bis{aqua[5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido-κ2 N 1,O]lead(II)}, [Pb2(C10H8N5O)4(H2O)2], (2), and hexakis[μ2-5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido-κ3 N 1,O:N 2]tricadmium(II), [Cd3(C10H8N5O)6], (3). The structures of these three compounds reveal that the nature of the metal ions and the side groups of the organic building blocks have a significant effect on the structures of the coordination compounds formed. Intermolecular hydrogen bonds link the molecules into two-dimensional [complex (1)] and three-dimensional hydrogen-bonded networks. Complexes (2) and (3) show significant fluorescence, while complex (1) displays no fluorescence.

Synthesis of several novel coordination complexes: ion exchange, magnetic and photocatalytic studies

2017 ◽  
Vol 41 (3) ◽  
pp. 1046-1056 ◽  
Author(s):  
Huijun Li ◽  
Yuan Wang ◽  
Yaling He ◽  
Zhouqing Xu ◽  
Xiaolei Zhao ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Coordination Complexes

Eight different novel polymers by the reactions of H2L and metal ions (Zn2+, Cu2+, Co2+) in the presence or absence of auxiliary ligands were constructed. The Zn2+ in complexes 1–3 could be partially exchanged with Cu2+ ions.

Metal-phenolic networks as a promising platform for pH-controlled release of bioactive divalent metal ions

2020 ◽  
Vol 511 ◽  
pp. 145569 ◽  
Author(s):  
Kui Xu ◽  
Mi Zhou ◽  
Ming Li ◽  
Weizhen Chen ◽  
Yabin Zhu ◽  
...  
Keyword(s):  
Controlled Release ◽  
Metal Ions ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Ph Controlled

Fundamental Aspects Of Polymer Metallization

1998 ◽  
Vol 511 ◽  
Author(s):  
F. Faupel ◽  
T. Strunskus ◽  
M. Kiene ◽  
A. Thran ◽  
C. V. Bechtolsheim ◽  
...  
Keyword(s):  
Metal Ions ◽  
Elevated Temperatures ◽  
Deposition Process ◽  
Interfacial Chemistry ◽  
Interface Formation ◽  
Structural Investigations ◽  
Metal Diffusion ◽  
Lower Reactivity ◽  
Polymer Metallization ◽  
Means Of Transmission

ABSTRACTValuable information on the structure and formation of metal-polymer interfaces originates from radiotracer measurements of metal diffusion at the interface, structural investigations by means of transmission electron microscopy, and computer simulations on the interplay of atomic metal diffusion and aggregation. Moreover, X-ray photoemission spectroscopy has largely contributed to our present understanding of the interfacial chemistry and the early stages of interface formation. While reactive metals always form relatively sharp interfaces with polymers, metals of lower reactivity diffuse into polymers at elevated temperatures and have a very strong tendency to agglomerate. The extent of diffusion appears to be determined by the initial stage of the deposition process. Here sticking coefficients recently measured for metals on virgin polymer surfaces deviate markedly from unity. Diffusion into the polymer increases strongly at low deposition rates. No significant diffusion is expected from a continuous metal film unless metal ions are formed at the interface. Metal ions are highly mobile and do not aggregate due to electrostatic repulsion. The model emerging from these observations allows us to predict the salient features of interface formation between metals and polymers in general and particularly with respect to the new low-k polymers.

scholarly journals Near-IR-Triggered, Remote-Controlled Release of Metal Ions: A Novel Strategy for Caged Ions

2014 ◽  
Vol 53 (40) ◽  
pp. 10678-10681 ◽  
Author(s):  
Ahmet Atilgan ◽  
Esra Tanriverdi Eçik ◽  
Ruslan Guliyev ◽  
T. Bilal Uyar ◽  
Sundus Erbas-Cakmak ◽  
...  
Keyword(s):  
Controlled Release ◽  
Metal Ions ◽  
Near Ir ◽  
Novel Strategy

Metal ion-coordinated carboxymethylated chitosan grafted carbon nanotubes with enhanced antibacterial properties

RSC Advances ◽  
2016 ◽  
Vol 6 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Xiangping Hao ◽  
Shougang Chen ◽  
Hui Yu ◽  
Dan Liu ◽  
Weixiang Sun
Keyword(s):  
Carbon Nanotubes ◽  
Controlled Release ◽  
Metal Ions ◽  
Metal Ion ◽  
Antibacterial Properties ◽  
Carboxymethyl Chitosan ◽  
Multiwalled Carbon ◽  
Covalently Bonded ◽  
Carboxymethylated Chitosan

Multiwalled carbon nanotubes were covalently bonded with carboxymethyl chitosan using the grafting method. The composites revealed notable controlled release properties and, after coordination with metal ions, the complexes exhibited good long-term antibacterial properties.

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