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BY 4.0 license Open Access Published by De Gruyter Open Access April 10, 2019

Theoretical Diagnostics of Second and Third-order Hyperpolarizabilities of Several Acid Derivatives

  • A. Karakas , Y. Ceylan , M. Karakaya , M. Taser , B. B. Terlemez , N. Eren EMAIL logo , Y. El Kouari , M. Lougdali , A. K. Arof and B. Sahraoui
From the journal Open Chemistry

Abstract

The density functional theory (DFT) at B3LYP/6-31G(d) level has been utilized to achieve the electric dipole moment (μ),static dipole polarizability (α)and first hyperpolarizability (β)values for ferulic acid (1) and chenodeoxycholic acid (2). The time-dependent Hartree-Fock (TDHF) technique as a powerful quantum chemical method has been implemented to reveal the dynamic α,βand third-order hyperpolarizabilities (γ)of the examined compounds. Our computational conclusions have been compared with the results of similar materials in the literature. The first and second frontier molecular orbitals (MOs) and their band gaps have also been investigated by means of DFT.

Graphical Abstract

1 Introduction

To determine the magnitudes of first hyperpolarizabilities is quite important for the devices provided the second-harmonic generation (SHG) and quadratic electro-optic responses. So, the push-pull type π-electronarrangements associated with aromatic chains and unsaturated bonds and also unsymmetrically substituted donors and acceptors have been especially designed to obtain the SHG processes [1]. It has been also shown that the molecules with octupolar symmetries are among the efficient molecular materials [2]. The third-order macroscopic NLO susceptibilities are directly related to their corresponding microscopic cubic responses. The images of biological structures are provided by the third-harmonic generation (THG) technique indicating the variations on the third-order NLO susceptibilities [3].

In this work, one of our aims is to focus on theoretically evaluating the second and third-order NLO behaviour of the title molecules in Figure 1. The μ,dispersion-free αand β values have been produced using DFT calculations. The dynamic dipole polarizabilities, quadratic and cubic hyperpolarizabilities have been also computed by means of ab-initio quantum mechanical approach (TDHF). Besides, the highest occupied molecular orbitals (HOMOs) and the lowest unoccupied molecular orbitals (LUMOs) have been defined by DFT/B3LYP.

Figure 1 Bond-line formulas of Ferulic acid (1) and Chenodeoxycholic acid (2).
Figure 1

Bond-line formulas of Ferulic acid (1) and Chenodeoxycholic acid (2).

2 Theoretical Calculations

We have firstly performed the optimization studies on the examined structures. After the geometry optimizations, we have calculated the μ,static αandβfor 1-2 utilizing the finite field (FF) procedure [4]. The GAUSSIAN03W [5] package program using DFT method at B3LYP/ 6-31G(d) level has carried out the computations of optimization, μ,static αandβ.To build the molecular models of examined compounds shown in Figure 2, GaussView [6] program has been utilized as the interface program for GAUSSIAN03W [5]. The total electric dipole moments in terms of electric dipole moment components (μx,μy,μz),the orientationally averaged (isotropic) dipole polarizabilities αand the magnitudes of βtot (total first static hyperpolarizability) are evaluated as follows, respectively [7,8]:

(1)μ=[μx2+μy2+μz2]1/2
(2)α=(αxx+αyy+αzz)/3
(3)βtot=[(βxxx+βxyy+βxzz)2+(βyyy+βyzz++βyxx)2+(βzzz+βzxx+βzyy)2]1/2

The TDHF procedure of the GAMESS [9] package program has obtained the γ(0;0,0,0)at ω=0andα(ω;ω),β(2ω;ω,ω),γ(3ω;ω,ω,ω)values at ω=0.04282atomic units (a.u.) (λ = 1064 nm) with 6-31G(d) basis set. The dispersion-free second hyperpolarizabilities are expressed as γ(0;0,0,0).The SHG and THG groups, respectively, in TDHF method have generated the β(2ω;ω,ω)and γ(3ω;ω,ω,ω)calculations at the studied ω frequencies.

Figure 2 Molecular models of Ferulic acid (1) and Chenodeoxycholic acid (2).Ethical approval: The conducted research is not related to either human or animal use.
Figure 2

Molecular models of Ferulic acid (1) and Chenodeoxycholic acid (2).

Ethical approval: The conducted research is not related to either human or animal use.

Using the following equations, we have computed the βV(βvector)which is the vector part of the second-order hyperpolarizability and the averaged (isotropic) second hyperpolarizability γ :

(4)βV=(βx2+βy2+βz2)1/2

where βi(i=x,y,z)is given by:

(5)βi=(1/3)j=x,y,z(βijj+βjij+βjji)
(6)γ=(1/5)[γxxxx+γyyyy+γzzzz+2(γxxyy+γxxzz+γyyzz)]

The GAUSSIAN03W [5] package program at DFT/ B3LYP level with 6-31G(d) basis set has also derived the HOMOs, LUMOs and HOMO-LUMO energy band gaps. The HOMO-LUMO energy gaps ( Eg ) are achieved by the following expression:

(7)Eg=ELUMOEHOMO

3 Computational Results And Discussion

Table 1 lists the electric dipole moments of the title molecules. It has been found that the μ values of 1-2 are almost same for both studied acids (Table 1). The μ value for 1 has been calculated (μ=4.583D)by Sebastian et al. utilizing ab-initio quantum mechanical techniques [10]. Our computed data on μ of 1 (Table 1) is almost 1.6 times lower than the estimated value in Ref. [10]. The μ value of 1 was calculated utilizing DFT technique by Kumar et al. as μ =3.22 D [11]. The reported μ of 3.22 D by Ref. [11] is in good agreement with our calculated value of 2.807 D (Table 1). Calaminici et al. calculated the dipole moment ( μ =3 D) with DFT method of a phosphonic acid stilbene derivative containing the conjugated stilbene backbone, which is p-substituted by a methoxy electron donor group and p′ -substituted by a phosphonic acid electron acceptor moiety [12]. Our computed data on μ for 1-2 (Table 1) are quite close to the evaluated result by Ref. [12]. It has been found that the DFT results on μ values of 1-2 have given rather consistent results with the computed DFT data for similar structures in Refs. [11,12], while the other technique (ab-initio method) used in Ref. [10] yield a numerical diversity.

Table 1

The calculated electric dipole moments μ (Debye) and dipole moment components for 1-2 using DFT method at B3LYP/6-31G(d) level.

Compoundμxμyμzμ
12.5591.1550.0002.807
2-1.642-1.5631.5072.722

Tables 2-4, respectively, show a few important computed components for the static dipole polarizabilities, first and second hyperpolarizabilities of 1-2. The dispersion-free 〈α〉 values in Table 2 have an apparent reduction in sort order 2 > 1. The static 〈α〉 value of a

Table 2

Some selected components of the static α(0;0)andα(0;0)(×1024esu)values for 1-2 computed by DFT method at B3LYP/6-31G(d) level.

Compoundαxαyαzα
133.40118.6617.08419.715
247.73334.70930.25337.565
Table 3

Some selected components of the static β(0;00) and βtot(0;00)(×10-30esu)values for 1-2 computed by DFT method at B3LYP/ 6-31G(d) level.

Compoundβxxxβyyyβyyzβxzzβzzzβtot
1-20.295-0.423-0.008-0.014-0.004 21.272
20.567-0.045-0.105-0.2390.380 0.709
Table 4

All static γ(0;0,0,0)components and γ(0;0,0,0)(×10-37esu)values for 1-2 computed by TDHF method with 6-31G(d) basis set.

γxxxxγyyyyγzzzzγxxyyγxxzzγvvzzγ
1407.4204.716-0.23311.5921.4430.76187.899
233.0032.9670.3233.8580.5980.1069.084

phosphonic acid stilbene derivative with a conjugated stilbene backbone was computed by DFT with a triple zeta valence basis set (TZVP) to be 41.854× 10-24 esu [12]. The calculated static αvalue reported by Calaminici et al. [12] are about 2 and 1.1 times, respectively, higher than that of 1 and 2 in Table 2. The static first hyperpolarizability of a phosphonic acid stilbene derivative containing a conjugated stilbene backbone was reported at DFT/TZVP level to be 44.075× 10-30 esu by Ref. [12]. Our result on βtotfor 1 (Table 3) is almost a factor of 2 lower than the presented data by Calaminici et al. [12]. To change the basis sets (TZVP) in the same method (DFT) for a similar acid reported by Ref. [12] has found out numerically discrepancies with the static αandβresults of 1-2 (DFT method and 6-31G(d) basis set). It is seen from Table 4 that the dispersion-free γvalues show a reduction in sort order 1>2.

Tables 5-7, respectively, give a few important calculated components for dynamic dipole polarizabilities, second and third-order hyperpolarizabilities of 1-2. The dynamic αandγvalues display the same reduction in sort order 2 > 1 (for αvalues) and 1 > 2 (for γvalues) as their corresponding static ones (see Tables 2,4,5,7). Song et al obtained the dynamic βvalue of 35×10-30esu using Hyper-Rayleigh scattering (HRS) technique at 532 nm for 5-(3,4-dimethoxybenzylidene) barbituric acid [13]. The quadratic hyperpolarizability of non-aromatic amino acid lysine was measured by means of HRS at 800 nm to be 0.3×10-30 esu [14]. The theoretical βVvalues for 1(βV=32.428×10-30esu)and 2(βV=0.196×10-30esu),respectively, in Table 6 are in accordance with the experimental results of similar acids in the literature reported by Refs. [13,14]. Our computed results on dynamic first hyperpolarizabilities could be compared with the result of urea which is well-known an efficiency standard in order to find out second-order NLO characterization. The βVvalues for 1 and 2, respectively, have been obtained 72 times higher (for 1) and 2.3 times lower (for

Table 5

Some selected components of the frequency-dependent α(ω;ω)and absolute values of α(ω;ω)(×10-24esu)at ω =0.04282 a.u. for 1-2 computed by TDHF method with 6-31G(d) basis set.

Compoundαxxαyyαzzα
121.93612.3182.39212.215
225.93320.37417.62821.311
Table 6

Some selected components of the frequency-dependent β(2ω;ω,ω)andβV(×10-30esu)values at ω=0.04282a.u.for1-2 computed by TDHF method with 6-31G(d) basis set.

Compoundβxxxβyyyβzzzβxβyβzβ-V
110.401-0.4210.00031.7186.746-0.00032.428
20.0360.0210.0710.023-0.1440.1300.196
Table 7

Some selected components of the frequency-dependent γ(3ω;ω,ω,ω)and absolute values of γ(3ω;ω,ω,ω)(×10-35esu) at ω=0.04282a.u. for 1-2 computed by TDHF method with 6-31G(d) basis set.

Compoundγxxxxγyyyyγzzzzγxxyyγxxzzγyyzzγ
17.5090.062-0.0020.1450.0200.0081.601
20.3590.0320.0040.0410.0060.0010.099

2) than the quadratic hyperpolarizability of urea (βurea=0.45× 10-30 esu) reported by Ledoux et al. [15]. The dynamic γvalues for the title molecules are about factors of 1.25 higher (for 1) and factors of 12.8 lower (for 2) than the cubic hyperpolarizability of para-nitroaniline (p-NA) (γp-NA=1.271×10-35esu)given in [16] which is one of the reference materials utilized in third-order NLO area. Since the NLO parameters, their magnitudes and frequency dependences for 1-2 are determined by ab-initio and DFT levels of theory, these levels of understanding and such theoretical insights make viable computer-aided molecular design of new NLO materials in the future. It is shown that the non-zero μvalues for 1-2 might cause microscopic quadratic and cubic hyperpolarizabilities with non-zero values derived by the numerical second-derivatives of the electric dipole moments to extent the implemented field. The presented data on dynamic βVandγwith non-zero values predict that the title compounds might acquire microscopic second and third-order NLO responses. As was to be expected from the comparisons with the urea standard, compound 1 might also possess macroscopic second-order NLO responses with non-zero

values in NLO measurements. So, compound 1 could be a promising material having quadratic electro-optic responses in second-order NLO applications, such as SHG experiments. Hence, compared with compound 2, compound 1 may fulfill many of quadratic optical nonlinearity requirements and could have potential applications in NLO and electro-optic devices.

Table 8 presents the computed first and second frontier MO energies and also band gaps for 1-2. Figure 3 shows the first and second frontier MOs. Since the charge transfer stimulations containing HOMO and LUMO affect the second and third-order optical nonlinearities, the lower HOMO-LUMO energy band gaps should generate the higher first and second hyperpolarizability values. In this work, the HOMO-LUMO and (HOMO-1)-(LUMO+1) energy band gaps have a reduction in sort order 2 > 1, while the calculated values of dynamic βVandγshow an inverse reduction in sort order 1 > 2 (see Tables 6-8). It is obvious that the HOMO-LUMO energy band gaps and hyperpolarizabilities introduce an opposite correlation [17]. The LUMO for 1 is localized on almost the whole molecule, while the HOMO is mainly localized on methoxy and hydroxyl groups, consequently the HOMO ➝ LUMO transition implies an electron density transfer to aromatic part and propenoic acid of π -conjugated system from methoxy and hydroxyl group (Figure 3). The HOMO, HOMO-1, LUMO+1 for 2 are located over the benzene rings. By contrast, the LUMO of 2 is mainly located over the side chain (Figure 3).

Table 8

The calculated HOMO-LUMO energy (a.u.) and HOMO-LUMO band gap Eg values for 1-2 using DFT method at B3LYP/ 6-31G(d) level.

12
HOMO-0.20926-0.25174
LUMO-0.058590.01445
Eg[HOMO–LUMO]0.150670.26619
HOMO–1-0.24793-0.25346
LUMO +1-0.002070.06196
Eg[(HOMO–1)–(LUMO+1)]0.245860.31542
Figure 3 The frontier and second frontier molecular orbitals of Ferulic acid (1) and Chenodeoxycholic acid (2).
Figure 3

The frontier and second frontier molecular orbitals of Ferulic acid (1) and Chenodeoxycholic acid (2).

4 Conclusions

We have determined the dispersion-free and frequency-dependent dipole polarizabilities, quadratic and cubic hyperpolarizabilities utilizing DFT and TDHF approaches, respectively. The microscopic second and third-order optical nonlinearity behaviour for 1-2 have been confirmed by the non-zero hyperpolarizability values computed in this work. We have also made the comparisons for μ,static and dynamic α,β,γresults of the title compounds with the corresponding NLO parameters of similar structures previously reported in the literature. The applied computational techniques (DFT and TDHF) in this paper presented quite comparable results with the reported data in the literature. It has been shown that some numerical discrepancies between our results and the obtained data in the literature for similar acid derivatives could originate from different methods or basis sets preferred in the computations. One can also see from the comparisons on NLO efficiencies of 1-2 related to reference compounds (urea and p-NA) that compound 1 with quite high βVresult offers a successful quadratic NLO behaviour. Both various chemical reactions and also resonance phenomena belonging to the structural properties for 1-2 could be understood with information of the HOMOs, LUMOs and HOMO-LUMO band gaps. To investigate the charge transfer properties of the examined structures, the HOMO and LUMO energies have been found out by means of DFT. One can benefit from the first and second frontier MOs determined here for the title compounds to explain their molecular structures and reactivities. Besides, since the better hyperpolarizability responses are attained by the systems with rather low HOMO-LUMO band gaps, in this work, HOMOs, LUMOs and HOMO-LUMO band gaps for 1-2 have been obtained to define their NLO properties. Our computational results on first and second frontier MOs for 1-2 justify the relationship between HOMO-LUMO band gaps and NLO responses, supporting an inverse behaviour.

  1. Conflict of interest: Authors declare no conflict of interest.

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Received: 2018-01-25
Accepted: 2018-09-21
Published Online: 2019-04-10

© 2019 A. Karakas et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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