scholarly journals Direct observation and structural characterization of natural and metal ion-exchanged HEU-type zeolites

2015 ◽  
Vol 210 ◽  
pp. 185-193 ◽  
Author(s):  
Maria Filippousi ◽  
Stuart Turner ◽  
Maria Katsikini ◽  
Fani Pinakidou ◽  
Demetris Zamboulis ◽  
...  
Keyword(s):  
Direct Observation ◽  
Structural Characterization ◽  
Metal Ion

Structural variations of trinitrato(terpyridine)lanthanoid complexes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahsa Armaghan ◽  
Khodabakhsh Darzinezhad ◽  
Mostafa M. Amini ◽  
Christoph Janiak
Keyword(s):  
Metal Ions ◽  
Coordination Number ◽  
Structural Characterization ◽  
Metal Ion ◽  
Hirshfeld Surface ◽  
Structural Variations ◽  
Coordination Polyhedra ◽  
Percentage Contribution ◽  
Terpyridine Ligands

Abstract The structural characterization of the newly synthesized trinitrato(terpyridine)lanthanoid complexes [Nd(NO3)3(pytpy)(H2O)] (1), [Eu(NO3)3(pytpy)(EtOH)]·EtOH (2·EtOH) and [Tb(NO3)3(ptpy)(EtOH)] (3), with the modified terpyridine ligands pytpy = 4′-(pyridin-3-yl)-2,2′:6′,2″-terpyridine and ptpy = 4′-phenyl-2,2′:6′,2″-terpyridine, show all a coordination number of 10 at the metal ion with three bidentate nitrato ligands and an additional solvent ligand. The coordination polyhedra around the metal ions are highly irregular. Hirshfeld surface analyses of the intermolecular interactions show (C/O–)H⋯O bonding having the largest percentage contribution in all three structures, while there are remarkably few π-π interactions despite the numerous aryl rings.

Synthesis and structural characterization of bisazocalix[4]arene with melamine: Metal ion extraction studies

2015 ◽  
Vol 202 ◽  
pp. 134-140 ◽  
Author(s):  
Serkan Elçin ◽  
Özlem Özen Karakuş ◽  
İzzet Kara ◽  
Hasalettin Deligöz
Keyword(s):  
Structural Characterization ◽  
Metal Ion ◽  
Metal Ion Extraction ◽  
Ion Extraction

Metal Ion Binding to Calixarenes: Pendent Arm Coordination Assisted by Self-Inclusion

1994 ◽  
Vol 47 (6) ◽  
pp. 1185 ◽  
Author(s):  
JM Harrowfield ◽  
M Mocerino ◽  
BW Skelton ◽  
CR Whitaker ◽  
AH White
Keyword(s):  
Structural Characterization ◽  
Metal Ion ◽  
Room Temperature ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Cone Conformation ◽  
X Ray ◽  
Partial Cone ◽  
Arm Coordination

The synthesis and room-temperature single-crystal X-ray structural characterization of 25,27- di(allyloxy)-5,17-di-t-butyl-26,28-dimethoxycalix[4]arene are recorded. Crystals are monoclinic, C2/c, a 29.089(5), b 10.742(2), c 26.218(8) Ǻ, β 110.09(2)°, Z = 8; the structure was refined to a residual of 0.065 for 4103 independent 'observed' [I > 3σ(I)] reflections. The flattened partial cone conformation of the molecule allows inclusion of one of the methoxy substituents in a way which could block inclusion of a metal ion capable of polyhapto aromatic coordination and which may therefore explain why solution n.m.r. measurements indicate that silver(I) binds to the pendent alkene groups.

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