Chemical structure versus second-order nonlinear optical response of the push–pull type pyrazoline-based chromophores

Abstract

In this study, we present experimental results of the second-order nonlinear optical response of a series of pyrazoline derivatives.

All-optical switching in dye-doped DNA nanofibers

“…S1 and S2) 42. Recently, pyrazoline derivatives were utilized by us for light amplification (in laser action or random lasing),3,43–45 multiphoton absorption,42,46 and generation of light at higher harmonics,47,48 and their structure was found to be modified by light in a reversible way through trans or cis states 49,50…”

Unveiling a versatile heterocycle: pyrazoline – a review

“…2). 43 The geometries of many pyrazoline derivatives have been characterized crystallographically and are shown to be driven by the establishment of CH-p interactions, consequently resulting in the stacking of the molecules to be packed as a crystal; these types of interactions have been found to be strong enough to stabilize a particular conformation of molecules for their higher-order self-assembly. [44][45][46][47] The signicant ndings from the detailed crystal analysis of some pyrazoline molecules suggest that the stacking modes of molecules and intermolecular electronic interactions provide signicant prospects in the tuning of solid-state uorescence.…”

“…The donor (D) and the acceptor (A) are marked in red and blue, respectively. The compounds shown are ( 43 Fig. 3 Scheme showing the photophysics of PY-pNO 2 .…”

Synthesis and Nonlinear Studies on Selected Organic Compounds in Nanostructured Thin Films

“…The organic molecules which contain a couple, donor (D)-acceptor (A) (or "push-pull" system), connected to a system which contributes to the delocalization of the π-electrons make the classic structures with optical response due to large hyperpolarizabilities that arise from a combination of strong electron-donating groups (e.g., ▬NR 2 , ▬OR) and strong electronwithdrawing groups (e.g., ▬NO 2 , ▬CN), positioned at the opposite ends of a conjugated system (see Figure 2) [16,23,31,32]. Therefore, the synthesis of the classic structures occupies a central place even in the current research.…”