Journal of Physical Organic Chemistry最新文献

{"title":"A new method for determining the intrinsic resistance energy of H-atom transfer reaction and structure–activity relationship of H-donating ability","authors":"Yan-Hua Fu,&nbsp;Fang Wang,&nbsp;Zhongyuan Zhou,&nbsp;Liguo Yang,&nbsp;Guang-Bin Shen,&nbsp;Xiao-Qing Zhu","doi":"10.1002/poc.4584","DOIUrl":"10.1002/poc.4584","url":null,"abstract":"<p>The intrinsic resistance energy Δ<i>G</i>^≠_XH/X of H-donor XH in hydrogen atom transfer (HAT) reaction is usually used to evaluate the kinetic H-donating ability. In this article, a new method for determining Δ<i>G</i>^≠_XH/X of H-donor in HAT reaction was proposed by the definition of thermo-kinetic parameter Δ<i>G</i>^≠o (XH) = 1/2[Δ<i>G</i>^≠_XH/X + Δ<i>G</i>^o (XH)]. Δ<i>G</i>^≠o (XH) is the characteristic physical parameter of XH to describe the H-donating ability in a chemical reaction during a certain reaction time, Δ<i>G</i>^o (XH) is the bond dissociation free energy. The kinetic studies of HATs between 20 alcohols, ethers, alkanes and amines (XH) with cumyloxyl radical [PhC (CH₃)₂O^•, CumO^•] were researched, and Δ<i>G</i>^o (XH), Δ<i>G</i>^≠_XH/X, and Δ<i>G</i>^≠o (XH) were used to investigate the H-donating abilities of the studied substrates in thermodynamics, kinetics, and HAT reaction. The effect of structures of XH on these three parameters, the structure–activity relationship, such as the influence of electronic, steric, polar and stereoelectronic effects of substituents, heteroatoms insertion in cycloalkanes, and <i>cis–trans</i> configurational isomerism on the H-donating abilities were discussed in detail. This study not only provides a new method for determining Δ<i>G</i>^≠_XH/X but also systematically studies the factors affecting the H-donating ability, laying a foundation for the selection, design, and synthesis of more efficient antioxidants.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138527673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electronegativity effect on the ESIPT process of 4′-N,N-dimethylamino-3-hydroxyflavone (DMA3HF) and its derivatives","authors":"Zhiqiang Liu,&nbsp;Ligang Han,&nbsp;Xiali Wang,&nbsp;Yi Wang,&nbsp;Yingmin Hou","doi":"10.1002/poc.4583","DOIUrl":"10.1002/poc.4583","url":null,"abstract":"<p>4′-N,N-dimethylamino-3-hydroxyflavone (DMA3HF) has antioxidant activity and excited state proton transfer (ESIPT) property. In this study, the influence of electronegativity on the ESIPT process has been studied by DFT/TD-DFT methods. Except DMA3HF, the substitutes of S and Se have been designed. The analysis of main bond parameters, infrared vibration spectra, and reduced density gradient function shows that the reduction of atomic electronegativity could promote the ESIPT process. Dihedral angle, frontier molecular orbitals and hole-electron analysis indicate that the twisted intramolecular charge transfer (TICT) process has been enhanced by the decreasing electronegativity. The results show that the decrease of atomic electronegativity is beneficial to TICT and ESIPT processess.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138527683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of N, S atoms on the mechanisms of H-transfer for five-membered nitrogen-containing heterocycles","authors":"Yan-Hua Fu,&nbsp;Kai Wang,&nbsp;Liguo Yang,&nbsp;Guang-Bin Shen,&nbsp;Xiao-Qing Zhu","doi":"10.1002/poc.4582","DOIUrl":"10.1002/poc.4582","url":null,"abstract":"<p>As the mechanisms of the hydride transfer reaction between 7,8-dihydro-9-methylcaffeine (CAFH) with <i>N</i>-methylacridinium (AcrH⁺ClO₄^-) and hydrogen atom transfer (HAT) reaction between 2,3-dihydrobenzo-imidazoles (BIH) with 2,2-diphenyl-1-picrylhydrazyl radical (DPPH^•) were researched to both be induced by electron transfer, the reaction mechanisms of 2,3-dihydrobenzo-thiazoles (BTH) with these two substrates were studied. The thermodynamic analysis platforms were used to judge the mechanisms, and the mechanisms of these two reactions were not the same with CAFH and BIH as the <i>E</i>_ox (BTH) value was more positive than CAFH and BIH. A new method for inferring the reaction mechanism was proposed using the kinetic equation Δ<i>G</i>^≠_XH/Y = Δ<i>G</i>^≠o (XH) + Δ<i>G</i>^≠o(Y) and thermo-kinetic parameter Δ<i>G</i>^≠o. The HAT reaction mechanisms between BTH with DPPH^• and ^tBu₃PhO^• were researched by Δ<i>G</i>^≠o_HD. As the Δ<i>G</i>^≠o (BTH) values in these two reactions were similar; hence, the rate determining steps of them were both HATs as the Δ<i>G</i>^≠o_HD(Y) values of DPPH^• and ^tBu₃PhO^• used for determining Δ<i>G</i>^≠o (BTH) were both in HAT reactions. The HAT reaction mechanisms between BIH with ^tBu₃PhO^• were also researched by thermodynamic analysis platform and kinetic isotope effect (KIE = 3.99), which confirmed that the rate determining step of BIH/^tBu₃PhO^• was indeed HAT. The H-donating ability of BIH and BTH was compared by Δ<i>G</i>^≠o_HD. From BIH to BTH, the substitution of <i>N</i> by <i>S</i> not only greatly reduces the thermodynamic electron donating and H-donating capacity of the compound but also increases the H-donating ability in kinetics and HAT reaction.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138527696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cooperativity and topological hydrogen bonding in aromatic diol complexes","authors":"Robert E. Rosenberg,&nbsp;John S. Lomas","doi":"10.1002/poc.4578","DOIUrl":"10.1002/poc.4578","url":null,"abstract":"<p>Complexes of three aromatic diols, catechol, naphthalene-1,8-diol, and fluorene-4,5-diol, with a series of hydrogen bond acceptors (HBAs) that have oxygen, nitrogen, and sulfur acceptor atoms, have been studied by density functional theory (DFT) at the B3LYP/6-311+G(d,p) level. Binding energies, geometries, infrared spectroscopic (IR) frequencies, nuclear magnetic resonance (NMR) shifts, and measures of the electron density distribution from the Quantum Theory of Atoms in Molecules (QTAIM) are evaluated and compared with data for the corresponding monohydroxy compounds (monols), phenol, naphth-1-ol, and fluorene-4-ol, in order to assess the importance of cooperativity between intramolecular and intermolecular hydrogen bonding. All measures for all complexes show positive cooperativity whereby both the intermolecular and intramolecular hydrogen bonds are strengthened upon complexation. Cooperativity is weak for catechol and strong for the other two diols and, for all diols, increases with the hydrogen bond basicity of the acceptor. Correlations of IR and NMR metrics against binding energies for a single HBA and all six monols and diols are excellent, but attempts to correlate the same metrics for all HBAs and a single donor are frustrated by differences in intermolecular hydrogen bonding, depending notably on the identity of the acceptor atom in the HBA. Atom–atom interaction energies, calculated by the Interacting Quantum Atoms approach, are used to discuss the covalency of both types of hydrogen bond.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Peripheral structural modification for devising push–pull strategy into 1,3,5-triaryl-2-pyrazoline-based compounds for nonlinear optical insights via density functional theory approach","authors":"Muhammad Nadeem Arshad,&nbsp;Muhammad Khalid,&nbsp;Umme Hani,&nbsp;Abdullah M. Asiri","doi":"10.1002/poc.4577","DOIUrl":"10.1002/poc.4577","url":null,"abstract":"<p>The nonlinear optical (NLO) insights of triarylpyrazoline-based (Z)-2-(2-((7-(4-(5-[2,4-dimethylphenyl]-1-phenyl-4,5-dihydro-1H-pyrazol-3-yl)phenyl)-4,4,9,9-tetramethyl-4,4a,9,10a-tetrahydro-s-indaceno[1,2-b:5,6-b′]dithiophen-2-yl)methylene)-3-oxo-2,3-dihydro-1H-inden-1-yl)malononitrile (<b>PR</b>) and its derivatives <b>P1</b>–<b>P7</b> were explored in this study. The compounds: <b>PR</b> and <b>P1</b>–<b>P7</b> having donor–π–acceptor configurations and M06/6-311G(d,p) functional was selected to inquire the dipole moment (<i>μ</i>), linear polarizability (<i>α</i>), first hyperpolarizability (<i>β</i>), and second hyperpolarizability (<i>γ</i>). The findings of perturbed Kohn–Sham relations were deciphered to derive charge density of the molecules. The optical analysis was performed in gaseous phase and their findings were observed in 544.2–697.1 nm range. Moreover, the natural bond orbitals, frontier molecular orbitals, density of state, and transition density matrices for the aforesaid compounds were also calculated at aforesaid level. Global reactivity parameters of <b>PR</b> and <b>P1</b>–<b>P7</b> were analyzed by using highest occupied molecular orbital–lowest unoccupied molecular orbital energies. Overall, all above-mentioned findings revealed significant optical nonlinear response in these pyrazoline-based scaffold (<b>PR</b> and <b>P1</b>–<b>P7</b>). However, among all the compounds, <b>P3</b> has shown the highest nonlinearity with maximum <i>μ</i>_<i>tot</i>, &lt;<i>α</i>&gt;, <i>β</i>_<i>tot</i>, and <i>γ</i>_<i>tot</i> values at 19.4 <i>D</i>, 1.78 × 10⁻²², 2.57 × 10⁻²⁷, and 3.13 × 10⁻³² <i>a.u</i>., respectively. Hence, the current computational study might prove to be fruitful for the exploration of proficient NLO materials for optoelectronic devices.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135273571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diels–Alder cycloadditions of fullerene: Advances in mechanistic theory","authors":"Hong-Yan Jiao,&nbsp;Chun-Xiang Li,&nbsp;Jun-Ru He,&nbsp;Jia-Li Peng,&nbsp;Pei-Ke Jia,&nbsp;Bin-Bin Xie,&nbsp;Cheng-Xing Cui","doi":"10.1002/poc.4579","DOIUrl":"10.1002/poc.4579","url":null,"abstract":"<p>Fullerene exhibits a wealth of interesting characteristics owing to its unique π-electron configuration. The structure and properties of fullerene can be manipulated by introducing chemical groups to the carbon–carbon bonds via organic reactions, extending its application field. The Diels–Alder (<b>DA</b>) cycloaddition reaction is commonly used to decorate the carbon cage of fullerene. Furthermore, atoms, ions, clusters, and molecules can be inserted into the hollow carbon cage of a fullerene, thereby changing the electron transfer process within the fullerene cage and thus the reactivity of the as well as the regioselectivity of the <b>DA</b> cycloaddition reaction. Computer-based theoretical modeling is an essential tool for studying chemistry. Herein, we provide a brief review of theoretical investigations into the cycloaddition mechanism of two most common fullerenes (C₆₀ and C₇₀), especially in terms of the effects of encapsulated chemical species based on the distortion–interaction model. We hope that the current mini review will provide a useful and interesting resource for researchers working on—or simply being interested in—the in silico investigation of fullerenes and their DA-based modification.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135273213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excited-state tautomerization of cytidine in water solution when exposed to UVC light","authors":"Tsvetina D. Cherneva,&nbsp;Mina M. Todorova,&nbsp;Rumyana I. Bakalska,&nbsp;Ivan G. Shterev,&nbsp;Ernst Horkel,&nbsp;Vassil B. Delchev","doi":"10.1002/poc.4576","DOIUrl":"10.1002/poc.4576","url":null,"abstract":"<p>The irradiation of water solution of cytidine with UVC light showed that the compound participates in a tautomerism following the kinetics of a first-order reaction. The PIDA mechanism showed that the proton detachments in the tautomers of cytidine occur through the repulsive ¹πσ* excited states and lead to conical intersections S₀/S₁, whose structures were optimized. More probable is the IRC mechanism, which proceeds along ¹nπ* excited state reaction paths. This mechanism includes a water molecule as a catalyst, which assists the phototransformation of amino-oxo tautomer of cytidine into imino-hydroxy one.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135267888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of metal-binding affinity for Cu+/Cu2+ complexes by hydrogen bond network","authors":"Ahmad Motahari,&nbsp;Alireza Fattahi","doi":"10.1002/poc.4571","DOIUrl":"10.1002/poc.4571","url":null,"abstract":"<p>Using density functional theory, polyols were used as model ligands for Cu⁺/Cu²⁺ complexes to study the role of the hydrogen bond network on the metal binding affinity. In addition to the gas phase studies, the calculations were performed in 1-decanol and DMSO solvents. The Cu²⁺ complexes were the most stable complexes with the highest bond dissociation energies (BDE). The presence of three H-bonds in the first shell increased BDE values up to 17.99 and 57.07 kcal/mol for Cu⁺ and Cu²⁺ complexes in the gas phase, respectively, whereas the presence of another three H-bonds in the second shell increased BDE values up to 7.27 and 24.35 kcal/mol for Cu⁺ and Cu²⁺ complexes in the gas phase, respectively. Therefore, this H-bond network caused, for example, a more stable Cu⁺ complex with a formation constant of 1.4 × 10¹⁷ times. The natural bond orbital (NBO), atoms in molecules (AIM), and reduced density gradient (RDG) analyses showed that the intramolecular hydrogen bond network led to the enhancement of metal-binding affinity.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135993163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Substituted effects on bonding characteristics of cyclopentane-1,3-diyl diradicals monitored by time-resolved infrared spectroscopy","authors":"Masato Kondoh,&nbsp;Shunsuke Kuboki,&nbsp;Hidetaka Kume,&nbsp;Eriku Oda,&nbsp;Manabu Abe,&nbsp;Taka-aki Ishibashi","doi":"10.1002/poc.4575","DOIUrl":"10.1002/poc.4575","url":null,"abstract":"<p>Cyclopentane-1,3-diyl diradicals (<b>DR</b>s) provide excellent opportunities to study the properties of diradicals because their lifetimes can be significantly lengthened to up to milliseconds with the introduction of proper substituents. This study investigated the bonding characteristics of singlet and triplet <b>DR</b>s having C=O and <i>p</i>-cyanophenyl groups (S-<b>DR3</b> and T-<b>DR3</b>) by monitoring the photo-induced formation of the diradicals from their precursor azo compounds using time-resolved IR (TR-IR) spectroscopy. Upon the formation of S-<b>DR3</b>, a C=O stretching wavenumber was upshifted by 22 cm⁻¹, whereas a C≡N stretching one was downshifted by 12 cm⁻¹. The observed shifts indicate that the unpaired electrons increase and decrease the C=O and C≡N bond orders, respectively. The effects of the unpaired electrons in S-<b>DR3</b> were similar to those observed in our previous TR-IR studies on a singlet cyclopentane-1,3-diyl diradical having C=O but no C≡N groups (S-<b>DR2</b>) and on that having C≡N but no C=O groups (S-<b>DR1</b>), respectively. Contrastingly, upon the formation of T-<b>DR3</b>, the C=O wavenumber was downshifted by 16 cm⁻¹, indicating that the unpaired electrons decrease the C=O bond order. More notably, no detectable shifts were observed in the C≡N stretching wavenumber. These observations are not clearly explained by a model suggested in the previous studies on S-<b>DR</b>s. Here, we discuss and propose a more elaborated resonance hybrid of <b>DR</b>s that can explain the directions and relative magnitudes of the observed wavenumber shifts irrespective of spin multiplicities. We expect that the findings and suggestions presented here will stimulate research in both organic and theoretical chemistry.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136212193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metameric Brooker's versus Reichardt's zwitterions: Conformational metamorphosis on optoelectronic properties, using coupled-perturbed and finite field theories","authors":"Divya Pant,&nbsp;Sanyasi Sitha","doi":"10.1002/poc.4569","DOIUrl":"10.1002/poc.4569","url":null,"abstract":"<p>This contribution reports influences of unusual conformational metamorphosis shown by <i>Reichardt's and Brooker's metameric</i> zwitterions by an earlier work, on various intrinsic electronic and optoelectronic properties. Detailed quantum mechanical investigations were carried out using HF, B3LYP, CAM-B3LYP, and ωB97xD methodologies. Observations suggest that whereas certain properties were directly and strongly influenced by the conformation preferences (<i>twisted</i> vs. <i>planar</i>), others were not strongly inclined to such conformational transformations. Interestingly, even with inherent conformational differences, observed properties were found to have only one major contributing component in each molecule and can be beneficial in one dimensional (<i>1D</i>) or <i>pseudo-1D</i> chromophore design strategies. Both coupled perturbed (<i>CP</i>) and finite field (<i>FF</i>) theories were used to compute dipole moments, polarizabilities, and hyperpolarizabilities, and so on, and excellent agreements (or exact matching results) were observed between the two theories. Reichardt's metamer was found to be more efficient in many aspects than Brooker's metamer. The direct and strong influences of metameric manipulations on structure–property correlations shown in this work can be adopted as a useful strategy for efficient chromophore design. Such a strategy is useful in the field of nonlinear optics, and may also find applications in various other areas of material sciences.</p>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"37 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/poc.4569","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135351712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}