Third-Order Nonlinear Optical Properties of C₆₀ CT Complexes with Aromatic Amines

Abstract

We have investigated third-order nonlinear optical properties of charge-transfer (CT) complexes of C 60 with various aromatic amines with different ionization potentials. The third-order nonlinear optical susceptibility |χ (3) | measured by degenerate four-wave mixing shows a resonant enhancement at the absorption band due to the CT transition. We have found that the second hyperpolarizability γ of CT complexes increases with an increase of the oscillator strength, which depends on the ionization potential. The highest hyperpolarizability among CT complexes studied here is 5.2 × 10 -28 esu for C 60 /aniline CT complex.

Molybdenum Complexes Bearing (Bi)thienyl‐ or Arylthienyl‐Substituted π‐Conjugated Spacers: Synthesis, Electrochemical, Spectroscopic and Nonlinear Optical Properties

“…Precursors 1a-b and 2 were commercially available and the synthesis of formyl-arylthiophenes 2b and 3 was described elsewhere. [35] The method to make the complexes with carbon-nitrogen bonds involves the initial conversion of trans-[M(N 2 ) 2 (dppe) 2 ] into the hydrazido(2-) complexes, trans-[MF(NNH 2 )(dppe) 2 ][BF 4 ]. [36,37] This complex is susceptible to electrophilic attack at the terminal nitrogen atom therefore they can serve as key intermediate in the preparation of organo-nitrogen complexes by subsequent reactions with organic carbonyl compounds.…”

“…[1][2][3][4] The exploitation of organometallic chemistry for the synthesis of new compounds with nonlinear optical (NLO) properties has been mainly driven by the optical devices technology. [5][6][7] The significant work already published in this area is in agreement with the general understanding that secondorder nonlinearities are strongly related to asymmetric push-pull systems, both in organic and organometallic molecular materials.…”

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A series of complexes trans-[FMo(N=NCHL)(dppe) 2 ][BF 4 ] {L = (bi)thienyl or arylthienyl}, were synthesized and fully characterized by 1 H, 13 C, 31 P NMR, IR and UV/Vis spectroscopy. The electronic spectra and electrochemical behavior of the complexes were investigated.

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Stable Charge-Transfer Complexes versus Contact Complexes. Application to the Interaction of Fullerenes with Aromatic Hydrocarbons

“…6 More recently, additional studies with aromatic and aliphatic amines were published. [7][8][9][10][11][12][13][14][15][16][17][18][19] In all cases, owing to the formation of CT complexes, a progressive increase in the intensity of the lowest energy absorption band with increasing amine concentration was reported. The changes in the electronic absorption spectrum of the mixture are much greater for C 60 than for C 70 .…”

DFT study on nonlinear optical properties of lithium-doped corannulene

“…Among these nine structures, the largest first static hyperpolarizability ( 0 ) is computed to be 15314 au, which is dramatically larger than the  0 value of 74 au for C 20 H 10 , indicating that Li doping plays an important role in elevating the first hyperpolarizability of corannulene. The extensive number of works that have been performed over the past two decades to investigate the nonlinear optical (NLO) properties of novel NLO materials [1][2][3][4][5][6][7] have been devoted to discovering the important/key influencing factors that can lead to dramatic increases in the first hyperpolarizability [8]. The strategies used mainly focused on utilizing molecules that contain extended -electron systems [9] or that can be characterized as planar donor--conjugated bridge-acceptor (D--A) types [10,11] [29].…”