Synthesis, Crystal Structure, and Second-Order Nonlinear Optical Properties of a New Bis(salicylaldiminato)nickel(II) Metal Complex

Abstract

The synthesis, crystal structure, electronic and second-order nonlinear optical (NLO) properties of a new bis(salicylaldiminato)nickel(II) Schiff-base complex are reported. The compound crystallizes in the space group P1 h. The NLO properties are investigated by electric field induced second harmonic (EFISH) and by INDO/SCI-SOS calculation. This compound obtained by condensation of 4-(diethylamino)salicylaldehyde and 1,2-diamino-4,5-dinitrobenzene in the presence of nickel(II) chloride exhibits the largest second-order NLO response reported for this family of bis(salicylaldiminato)nickel(II) metal complexes, with a × µ value of 1530 × 10 -48 cm 5 esu -1 . In addition, a thermal stability up to 300°C, indicates potential uses of metal-salen derivatives in poled polymers matrix with high T g .

Second-order nonlinear optics in coordination chemistry: An open door towards multi-functional materials and molecular switches

“…By contrast, there is a clear correlation between the magnetic and NLO signal in 29 [78]. Contrary to the previous studies carried out on SCO complexes in which the 1D "push-pull" character is dominant (26,27), the largest NLO signal is observed here at high temperature. This result is supported by a DFT computation.…”

“…Indeed, Ni II is involved as an additional donor in the NLO response of 5, but furthermore, and due to its position in the center of the -conjugated core, it enhances the intramolecular charge transfer behavior of the entire organic skeleton and finally leads to an enhancement of the overall NLO response (experimental v alue of 235 × 10 −30 esu and 109 × 10 −30 esu, at 1.34 m, for 5 and 6, respectively) [25]. The molecular hyperpolarizability in this class of nickel(II) Schiff-base complexes was further optimized in 7, with a × ˇ value of 1530 × 10 −30 esu ( in D) which is twice the value observed in 5 [26].…”

A Rigid Molecular Scaffold Affixing a (Polypyridine)ruthenium(II)‐ and a Nickel(II)‐Containing Complex: Spectroscopic Evidence for a Weakly Coupled Bichromophoric System

“…As an alternative we used the well-known template synthesis to prepare the Ni II complex 8 in almost quantitative yield. [21] Reduction of the nitro groups was carried out under hydrogen in the presence of Pd/C as catalyst. Complex 10 was synthesised in good yield following the condensation of the diamino derivative 9 with phendione 1 in refluxing methanol.…”

Synthesis and Characterizations of Highly Fluorinated Poly(arylene ether)s for Quadratic Nonlinear Optics

“…The experimental setup has been described elsewhere. 62 In order to monitor the dynamics of SHG generation, SHG measurements have been made at a fixed incident angle (30°) during the poling cycle. The secondorder susceptibilities d 33 of the copolymer films have been determined at 1907 nm by the Maker fringe method.…”