Electronic Hyperpolarisabilities of Some Mesogenic Stilbazole Complexes of Rh(I) and Ir(I)

Bruce, Duncan W.; Thornton, Anna

doi:10.1080/10587259308032510

Cited by 49 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 1994, Bruce and Thornton reported that the quadratic hyperpolarizability of a stilbazole, trans-4(S-(+)-2-methylbutoxy)-4′-stilbazole, increases upon coordination to a "cis-Ir(CO) 2 Cl" moiety [43]. Following this brief report, various iridium(I) metal complexes with pyridines (1) [44], stilbazole-related (2-4) [44][45], azaphenanthrene (5) [46] and azachrysene (6) [46] ligands (Fig.…”

Section: Iridium(i) Complexes With Monodentate Nitrogen Donor Ligandsmentioning

confidence: 99%

A trip in the nonlinear optical properties of iridium complexes

Colombo

Dragonetti

Guerchais

et al. 2020

Coordination Chemistry Reviews

View full text Add to dashboard Cite

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

Section: Iridium(i) Complexes With Monodentate Nitrogen Donor Ligandsmentioning

confidence: 99%

A trip in the nonlinear optical properties of iridium complexes

Colombo

Dragonetti

Guerchais

et al. 2020

Coordination Chemistry Reviews

View full text Add to dashboard Cite

show abstract

“…In the past few years, organometallic and coordination complexes have emerged as interesting molecular materials for second-order nonlinear optical (NLO) applications, because they offer a great diversity of tunable electronic properties by virtue of the metal center. , In particular with pyridines, , stilbazoles, − or bipyridines 2,6 bearing an electron-donor substituent, β vec , the vectorial projection of the quadratic hyperpolarizability tensor along the ground-state molecular dipole moment (μ) direction, measured by the solution-phase dc electric-field-induced second-harmonic (EFISH) generation method, increases upon coordination to a metal center. As confirmed by a solvatochromic investigation, , this enhancement is mainly due to a red shift of the intraligand charge transfer (ILCT) transition.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Coordination to M(II) Metal Centers (M = Zn, Cd, Pt) on the Quadratic Hyperpolarizability of Various Substituted 5-X-1,10-phenanthrolines (X = Donor Group) and of trans-4-(Dimethylamino)-4‘-stilbazole

Roberto¹,

Ugo²,

Tessore³

et al. 2001

Organometallics

View full text Add to dashboard Cite

Coordination to a Zn(II) center of chelating π-delocalized nitrogen donor ligands such as 5-X-1,10-phenanthrolines (X ) OMe, NMe 2 , trans-CHdCHC 6 H 4 -4′-NMe 2 , trans,trans-(CHd CH) 2 C 6 H 4 -4′-NMe 2 ) produces a significant enhancement of their quadratic hyperpolarizability measured either by the EFISH technique (β 1.34 ) or by absorption and emission solvatochromic investigations (β CT ) working with an incident wavelength of 1.34 µm. However, the enhancement factor by metal coordination of the quadratic hyperpolarizability of planar 5-X-1,10-phenanthrolines is lower than that of the nonplanar and flexible ligand 4-(p-(dibutylamino)styryl)-4′-methyl-2,2′-bipyridine because this latter ligand becomes planar and rigid by coordination. Coordination of 5-(trans-CHdCHC 6 H 4 -4′-NMe 2 )-1,10-phenanthroline to the softer Cd(CH 3 CO 2 ) 2 does not produce an enhancement of the quadratic hyperpolarizability. This is due to a significant decrease of ∆µ eg (difference of the dipole moment in the excited and ground states of the intraligand charge transfer (ILCT)) upon coordination to the Cd(II) center. Strangely enough, the second-order NLO response of Zn(II) and Pt(II) complexes carrying two 4-trans-NC 5 H 4 CHdCHC 6 H 4 -4′-NMe 2 stilbazole ligands in a tetrahedral or planar coordination indicates a significant increase, upon coordination, of the quadratic hyperpolarizability β CT , along the ILCT transition of the ligand, but an irrelevant increase of β 1.34 , which is the vectorial component of the tensor β along the molecular dipole moment axis, although in the free ligand both β CT and β 1.34 are comparable. The lack of coincidence of the molecular dipole moment axis with the direction of the ILCT transition of the ligand, a major origin of the second-order NLO response, could explain why β CT and β 1.34 values are not comparable. In fact, a detailed solvatochromic analysis shows that the increase of β CT upon coordination to Zn(II) or Pt(II) of the single stilbazole ligand is not significant, in agreement with EFISH measurements and the irrelevant red shift of the ILCT transition.

show abstract

“…Metal-containing liquid crystals, studied extensively since the mid-1980s, represent a new and very important development in the study of liquid-crystalline materials. Properties such as enhanced electronic polarizability and hyperpolarizability, dichroism, paramagnetism, and reactivity have been observed or are expected to result on inclusion of a metal center in a liquid-crystal compound.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis, Mesomorphism, and Characterization by X-ray Diffraction and Freeze-Fracture Electron Microscopy of Polycatenar Liquid Crystals of Silver(I) Showing Columnar and Cubic Mesophases

et al. 1997

Self Cite

View full text Add to dashboard Cite

Complexation of 3,4-dialkoxystilbazoles to Ag I has led to a new series of polycatenar, metalcontaining liquid crystals. The complexes were found to show mainly cubic and columnar mesophases, although short-chain homologues showed a different behavior due to a dissociation of one ligand in the melt. On cooling from the mesophase, some of the complexes formed a glassy state, rather than crystallizing. The mesophases were characterized by a combination of optical microscopy, differential scanning calorimetry, X-ray diffraction and freeze-fracture electron microscopy. Freeze-fracture electron microscopy was successful in identifying the symmetry of the cubic phase as Ia3 hd, while the transition between the cubic and columnar phase was studied by a combination of X-ray diffraction and dilatometry, allowing the proposal of a model for the transition between these two phases using their observed epitaxial relationship and requiring undulation of the columnar phase as proposed previously for lyotropic mesophases.

show abstract

Electronic Hyperpolarisabilities of Some Mesogenic Stilbazole Complexes of Rh(I) and Ir(I)

Cited by 49 publications

References 12 publications

A trip in the nonlinear optical properties of iridium complexes

A trip in the nonlinear optical properties of iridium complexes

Effect of the Coordination to M(II) Metal Centers (M = Zn, Cd, Pt) on the Quadratic Hyperpolarizability of Various Substituted 5-X-1,10-phenanthrolines (X = Donor Group) and of trans-4-(Dimethylamino)-4‘-stilbazole

The Synthesis, Mesomorphism, and Characterization by X-ray Diffraction and Freeze-Fracture Electron Microscopy of Polycatenar Liquid Crystals of Silver(I) Showing Columnar and Cubic Mesophases

Contact Info

Product

Resources

About