Dipolar and Non-Dipolar Pyridine and Bipyridine Metal Complexes for Nonlinear Optics

Abstract

Metal complexes of pyridine and bipyridine‐type ligands represent an important class of nonlinear optical (NLO) materials: (i) They can incorporate a variety of functionalised ligands with a wide range of metals which can give rise to tuneable NLO properties; (ii) they are generally associated with intense low‐lying charge‐transfer excitations such as metal to ligand charge‐transfer (MLCT) or intraligand charge‐transfer (ILCT); (iii) bipyridyl ligands are also good building blocks that allow the construction of octupolar complexes with a defined geometry and symmetry. This review describes the recent developments in the design of such dipolar and octupolar chromophores for second‐order nonlinear optics.

Thermally Robust Metal Coordination Polymers: The Cobalt, Nickel, and Zinc Pyrimidin-2-olate Derivatives

“…Therefore, in agreement with recent studies on C 2v DCM laser dye derivatives [27] and diazaaromatic metal complexes, [28] they are ideal candidates for testing NLO properties, such as second harmonic generation activity. [29] Preliminary measurements (λ exc ϭ 1064 nm) by the KurtzϪPerry technique [30] have indeed shown SHG efficiencies of about 5, 8, and 0.2% (urea as standard) for 1a, 1b, and 1c, respectively.…”

Diastereoselective Homochiral Self-Assembly Between Anions and Cation in Solution

“…[5] D 3 -symmetric propeller-like molecules are particularly interesting as a new class of octupolar chromophores for nonlinear optics (NLO). [6] Coordination chemistry is a powerful tool to design such compounds, [7] and recently we [8] and others [9] have reported the large molecular hyperpolarisability of octahedral ruthenium(II) complexes [Ru-(bpyЈ) 3 ][PF 6 ] 2 , where bpyЈ is a functionalized 2,2Ј-bipyridine. With the aim of increasing the NLO activity of such systems, we became interested in the association of Ru II cationic octupoles with counter anions also having a D 3 propeller-like topology.…”

Solvent Effect on the Structural, Electronic, Spectra Properties and First Hyperpolarizability of W(co)5l, L=(4-Pyridylmethylene)malononitrile

“…Linear and secondorder non-linear optical (NLO) properties of W(CO) 5 L complexes (where L is pyridine or its 4-substituted derivative) have been explored systematically [15][16][17][18][19][20][21][22][23]. The synthesis, structure and electronic absorption spectra of W(CO) 5 -pyridine-π-acceptor complexes have been studied [24].…”