The structural diversity of heterocycle-fused potassium cyclopentadienides

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

Download Full-text

Structural diversity of salts of terpyridine derivatives with europium(III) located in both, cation and anion, in comparison to molecular complexes

Zeitschrift für Kristallographie - Crystalline Materials ◽

10.1515/zkri-2020-0053 ◽

2020 ◽

Vol 235 (8-9) ◽

pp. 353-363

Author(s):

Alexander E. Sedykh ◽

Robin Bissert ◽

Dirk G. Kurth ◽

Klaus Müller-Buschbaum

Keyword(s):

Thermal Properties ◽

Crystal Packing ◽

Side Reaction ◽

Molecular Complexes ◽

Structural Diversity ◽

Organic Ligands ◽

Ionic Complexes ◽

Structural Variability ◽

Dimeric Complexes ◽

The Common

AbstractThree salts of the common composition [EuCl2(X-tpy)2][EuCl4(X-tpy)]·nMeCN were obtained from EuCl3·6H2O and the respective organic ligands (X-tpy = 4′-phenyl-2,2′:6′,2″-terpyridine ptpy, 4′-(pyridin-4-yl)-2,2′:6′,2″-terpyridine 4-pytpy, and 4′-(pyridin-3-yl)-2,2′:6′,2″-terpyridine 3-pytpy). These ionic complexes are examples of salts, in which both cation and anion contain Eu3+ with the same organic ligands and chlorine atoms coordinated. As side reaction, acetonitrile transforms into acetamide resulting in the crystallization of the complex [EuCl3(ptpy)(acetamide)] (4). Salts [EuCl2(ptpy)2][EuCl4(ptpy)]·2.34MeCN (1), [EuCl2(4-pytpy)2][EuCl4(4-pytpy)]·0.11MeCN (2), and [EuCl2(3-pytpy)2][EuCl4(3-pytpy)]·MeCN (3) crystallize in different structures (varying in space group and crystal packing) due to variation of the rear atom of the ligand to a coordinative site. Additionally, we show and compare structural variability through the dimeric complexes [Eu2Cl6(ptpy)2(N,N′-spacer)]·N,N′-spacer (5, 6, 7) obtained from [EuCl3(ptpy)(py)] by exchanging the end-on ligand pyridine with several bipyridines (4,4′-bipyridine bipy, 1,2-bis(4-pyridyl)ethane bpa, and 1,2-bis(2-pyridyl)ethylene bpe). In addition, photophysical (photoluminescence) and thermal properties are presented.

Download Full-text

Facile attachment of transition metal complexes to graphite electrodes coated with polymeric ligands. Observation and control of metal-ligand coordination among reactants confined to electrode surfaces

Journal of the American Chemical Society ◽

10.1021/ja00497a044 ◽

1979 ◽

Vol 101 (3) ◽

pp. 739-741 ◽

Cited By ~ 94

Author(s):

Noboru Oyama ◽

Fred C. Anson

Keyword(s):

Transition Metal ◽

Metal Complexes ◽

Transition Metal Complexes ◽

Graphite Electrodes ◽

Electrode Surfaces ◽

Ligand Coordination ◽

Polymeric Ligands ◽

And Control ◽

Metal Ligand

Download Full-text

Template-free multicomponent coordination-driven self-assembly of Pd(ii)/Pt(ii) molecular cages

Chemical Communications ◽

10.1039/c3cc49192g ◽

2014 ◽

Vol 50 (18) ◽

pp. 2239-2248 ◽

Cited By ~ 160

Author(s):

Sandip Mukherjee ◽

Partha Sarathi Mukherjee

Keyword(s):

Self Assembly ◽

Assembly Process ◽

Molecular Cages ◽

Recent Developments ◽

Ligand Coordination ◽

Template Free ◽

Metal Ligand

This article summarizes the recent developments in the construction of multicomponent molecular hollowed-out cages through the metal–ligand coordination-driven self-assembly process, with a focus on the decreasing relevance of the use of templates.

Download Full-text