Induction of Columnar Mesomorphism in Tetracoordinated Ionic Silver(<scp>I</scp>) Complexes Based on Chelate 4,4'‐Disubstituted 2,2'‐Bipyridines

Pucci, Daniela; Barberio, Giovanna; Bellusci, Anna; Crispini, Alessandra; Deda, Massimo La; Ghedini, Mauro; Szerb, Elisabeta I.

doi:10.1002/ejic.200500002

Cited by 45 publications

(26 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In analogy to the related achiral compounds previously investigated, [15] the absorptions at high energy are associated with the p-p* electronic transition of the single aromatic chromophores, while the weak n-p* transitions are related to the carboxylic groups.…”

Section: Mesomorphismmentioning

confidence: 96%

“…Indeed, whereas the silver(I) achiral complexes [Ag(L n ) 2 ]X were luminescent in solution, showing a maximum at about 350 nm attributable to a ligand-centered transition, [15] …”

Section: Mesomorphismmentioning

confidence: 99%

“…In these systems, the molecular organization in the mesophase is mainly driven by intermolecular attractive interactions that can induce liquid-crystalline properties regardless of the coordination geometry of the metal ion and the number of flexible chains. [14][15][16] With this in mind, we aim now to extend this strategy, to develop new chiral helical superstructures in columnar mesophases, through a synthetic pathway based on several construction motifs ranging from metal coordination, p-p interactions, ionic self-assembly, stereogenic centers, and the coordinating ability of counterions.…”

Section: Introductionmentioning

confidence: 99%

“…Since interesting luminescence properties have been reported for achiral [Ag(L n ) 2 ]X complexes, at room temperature, both in solution and in the solid state, [15] the photophysical properties of complexes 1-4 were also investigated by using UV/Vis spectroscopy. Moreover, to evaluate the possibility of the appearance of any helical organization in the mesophase the optical activity was investigated by using circular dichroism (CD) spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Silver Coordination Complexes as Room‐Temperature Multifunctional Materials

Pucci¹,

Barberio²,

Bellusci³

et al. 2006

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

A series of bischelate ionic silver complexes [Ag(L*)(2)][X] was prepared by complexation of a newly synthesized 2,2'-bipyridine containing chiral alkoxy chains in the 4,4' positions. The appropriate choice of the construction motifs allows the preparation of new materials in which several functionalities can be introduced. Indeed, when the anion X(-) is a triflate or a dodecylsulfate group, the right combination of intermolecular interactions promotes the production of liquid crystalline mesophases. Therefore, the presence of coordinating anions, which drives the supramolecular assembly, is essential to generate, at the same time, room-temperature columnar hexagonal mesomorphism, the columnar helical supramolecular structure, and excimeric emission.

show abstract

Section: Mesomorphismmentioning

confidence: 96%

“…Indeed, whereas the silver(I) achiral complexes [Ag(L n ) 2 ]X were luminescent in solution, showing a maximum at about 350 nm attributable to a ligand-centered transition, [15] …”

Section: Mesomorphismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Silver Coordination Complexes as Room‐Temperature Multifunctional Materials

Pucci¹,

Barberio²,

Bellusci³

et al. 2006

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

show abstract

“…[3] Luminescent mesogens have been well documented with metals such as the lanthanide group, [4] Pd, [5] Pt, [3,6] Au, [7] and Ag. [8] Unlike other first-row transition metals only very few examples of mesomorphic zinc(II) derivatives were reported until now.…”

Section: Introductionmentioning

confidence: 99%

Novel Green Light Emitting Nondiscoid Liquid Crystalline Zinc(II) Schiff‐Base Complexes

et al. 2011

View full text Add to dashboard Cite

A new series of nondisc-like Zn II Schiff base complexes of the type [Zn (4-C n H 2n+1 O) 2 salophen], n = 14, 16, 18, salophen = N,NЈ-phenylenebis(salicylideneiminato), have been prepared and their mesogenic, photophysical properties investigated. The mesomorphic behaviour of these compounds was studied by differential scanning calorimetry, polarized optical microscopy and X-ray diffraction (XRD) techniques. The ligands are found to be nonmesogenic, but their complexes exhibited a columnar mesomorphism. The XRD-study re-

show abstract

Metal‐Containing Liquid Crystals

Pucci

Donnio

2014

Handbook of Liquid Crystals

Self Cite

View full text Add to dashboard Cite

PreambleMetal-containing liquid crystals, commonly referred to as metallomesogens, a term invented by in the first comprehensive review on the subject, are metal complexes endowed with liquid crystalline (LC) properties. It is now well accepted that the first publication on metallomesogens was by Vorländer [2], who described in 1923 the smectogenic behavior of a series of Schiffbase complexes of diaryl mercury(II), despite earlier but sporadic publications on alkanoate magnesium salts by Heintz [3] and other related alkali metal soaps by Vorländer [4]. This field revived research interest half a century later with the concomitant pioneering publications by Malthête and Billard [5] on nematogenic ferrocene derivatives on the one hand and by Giroud and Mueller-Westerhoff on calamitic nickel(II) and platinum(II) dithiolene complexes (N and SmC phases) on the other hand [6].At first, metallomesogens were simply regarded as mere synthetic curiosities, but once the immense benefits of inserting metals into liquid crystals were acknowledged, activity in this field began to grow apace [1]. Metal-coordination of organic ligands indeed offers the possibility of obtaining a wide diversity of structures and functions (due to specific metal-metal, ligand-ligand, and metal-ligand synergies) as it is possible to combine a large range of potential organic ligands with metal ions of various numbers of coordination (NCs from 1 to 12). And indeed, numerous metallomesogens with new geometries (e.g., based on high coordination numbers) and shapes unattainable in organic systems diverging from standard calamitics and discotics, have been synthesized. Simultaneously, the use of multivalent ligands has also been more generalized and has led to intricate polymetallic systems that are expected to generate new functional supramolecular organizations. Evidently, metals are not limited to this purely structural role and, concomitantly to the production of metallomesogens with low transition temperatures and accessible mesophases, a wide range of physical properties (optical, magnetism, electronic, thermo-and solvatochromism, dichroism, conductivity, etc.), which crucially depend on the choice of the metal ion, can be exploited [7]. Incorporation of metals into modifications have led to new and sophisticated molecular structures, showing that the design of new LC materials is not restricted to simple shape anisotropies.The induction of preselected properties from the single molecular level to the supramolecular network in metal-containing materials is expected to expand the traditional range of technological applications of liquid crystals. It is currently possible to design new and better performing complexes whose structures, mostly unapproachable in purely organic LC systems, are able to induce low transition temperatures and modulate optical, electronic, magnetic, and thermal properties. Nowadays, the molecular design of metallomesogens is essentially based on the multimotif approach because of the spontaneous association of single func...

show abstract

Induction of Columnar Mesomorphism in Tetracoordinated Ionic Silver(I) Complexes Based on Chelate 4,4'‐Disubstituted 2,2'‐Bipyridines

Cited by 45 publications

References 24 publications

Silver Coordination Complexes as Room‐Temperature Multifunctional Materials

Silver Coordination Complexes as Room‐Temperature Multifunctional Materials

Novel Green Light Emitting Nondiscoid Liquid Crystalline Zinc(II) Schiff‐Base Complexes

Metal‐Containing Liquid Crystals

Contact Info

Product

Resources

About