Structure, intermolecular interactions and charge-density distribution of 2-amino-4-methoxy-6-methylpyrimidine with methylsulfamic acid and 4-hydroxybenzoic acid: a combined experimental and theoretical study.
{"title":"Structure, intermolecular interactions and charge-density distribution of 2-amino-4-methoxy-6-methylpyrimidine with methylsulfamic acid and 4-hydroxybenzoic acid: a combined experimental and theoretical study.","authors":"Hemalatha Balasubramanian, Veerapandian Vallapandian, Kumaradhas Poomani","doi":"10.1107/S2053229625002517","DOIUrl":null,"url":null,"abstract":"<p><p>The salts 2-amino-4-methoxy-6-methylpyrimidinium N-methylsulfamate, C<sub>6</sub>H<sub>10</sub>N<sub>3</sub>O<sup>+</sup>·CH<sub>4</sub>NO<sub>3</sub>S<sup>-</sup>, I, and 2-amino-4-methoxy-6-methylpyrimidinium 4-hydroxybenzoate, C<sub>6</sub>H<sub>10</sub>N<sub>3</sub>O<sup>+</sup>·C<sub>7</sub>H<sub>5</sub>O<sub>3</sub><sup>-</sup>, II, have been synthesized and characterized by single-crystal X-ray diffraction. The protonation process takes place in both salts from acid to base. In both salts, the ring and amine N atoms, and the sulfoxide and carboxylate O atoms form eight-membered R<sub>2</sub><sup>2</sup>(8) ring motifs. The nature of the different types of interactions present in the crystals have been explored using Hirshfeld surface analysis. The percentage contributions of the different interactions in the crystal structures have been calculated using 2D fingerprint plots. The volumes of the voids present in salts I and II are 233.25 and 398.48 Å<sup>3</sup>, respectively. The band gap energies (ΔE) of salts I and II are 3.2022 and 3.5357 eV, respectively, as calculated by frontier molecular orbital (FMO) analysis. In Bader's quantum theory of atoms in molecules (QTAIM) analysis, the values of the electron density [ρ(r<sub>cp</sub>)] and the Laplacian of the electron density [∇<sup>2</sup>ρ(r<sub>cp</sub>)] at the protonated region of salt I are 0.261 e Å<sup>-3</sup> and 2.889 e Å<sup>-5</sup>, respectively, and for salt II are 0.357 e Å<sup>-3</sup> and 3.2 e Å<sup>-5</sup>. The pharmacokinetic properties and drug-like nature of the salts were confirmed by in-silico ADME (Absorption, Distribution, Metabolism and Excretion) prediction.</p>","PeriodicalId":7115,"journal":{"name":"Acta Crystallographica Section C Structural Chemistry","volume":"81 Pt 5","pages":"273-281"},"PeriodicalIF":0.7000,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Crystallographica Section C Structural Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1107/S2053229625002517","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/15 0:00:00","PubModel":"Epub","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The salts 2-amino-4-methoxy-6-methylpyrimidinium N-methylsulfamate, C6H10N3O+·CH4NO3S-, I, and 2-amino-4-methoxy-6-methylpyrimidinium 4-hydroxybenzoate, C6H10N3O+·C7H5O3-, II, have been synthesized and characterized by single-crystal X-ray diffraction. The protonation process takes place in both salts from acid to base. In both salts, the ring and amine N atoms, and the sulfoxide and carboxylate O atoms form eight-membered R22(8) ring motifs. The nature of the different types of interactions present in the crystals have been explored using Hirshfeld surface analysis. The percentage contributions of the different interactions in the crystal structures have been calculated using 2D fingerprint plots. The volumes of the voids present in salts I and II are 233.25 and 398.48 Å3, respectively. The band gap energies (ΔE) of salts I and II are 3.2022 and 3.5357 eV, respectively, as calculated by frontier molecular orbital (FMO) analysis. In Bader's quantum theory of atoms in molecules (QTAIM) analysis, the values of the electron density [ρ(rcp)] and the Laplacian of the electron density [∇2ρ(rcp)] at the protonated region of salt I are 0.261 e Å-3 and 2.889 e Å-5, respectively, and for salt II are 0.357 e Å-3 and 3.2 e Å-5. The pharmacokinetic properties and drug-like nature of the salts were confirmed by in-silico ADME (Absorption, Distribution, Metabolism and Excretion) prediction.
合成了2-氨基-4-甲氧基-6-甲基嘧啶n -甲基磺酸盐c6h10n30o +·CH4NO3S-, I和2-氨基-4-甲氧基-6-甲基嘧啶4-羟基苯甲酸盐c6h10n30o +·C7H5O3-, II,并用单晶x射线衍射对其进行了表征。质子化过程发生在两种盐从酸到碱。在这两种盐中,环和胺N原子以及亚砜和羧酸O原子形成八元R22(8)环基序。利用赫什菲尔德表面分析,探索了晶体中存在的不同类型相互作用的性质。利用二维指纹图谱计算了晶体结构中不同相互作用的贡献百分比。盐I和盐II中存在的空隙体积分别为233.25和398.48 Å3。通过前沿分子轨道(FMO)分析,盐类I和盐类II的带隙能(ΔE)分别为3.2022和3.5357 eV。在Bader分子原子量子理论(QTAIM)分析中,盐I质子化区电子密度[ρ(rcp)]和电子密度[∇2ρ(rcp)]的拉普拉斯量分别为0.261 e Å-3和2.889 e Å-5,盐II质子化区电子密度[ρ(rcp)]的值分别为0.357 e Å-3和3.2 e Å-5。通过计算机ADME(吸收、分布、代谢和排泄)预测证实了盐的药代动力学性质和药物样性质。
期刊介绍:
Acta Crystallographica Section C: Structural Chemistry is continuing its transition to a journal that publishes exciting science with structural content, in particular, important results relating to the chemical sciences. Section C is the journal of choice for the rapid publication of articles that highlight interesting research facilitated by the determination, calculation or analysis of structures of any type, other than macromolecular structures. Articles that emphasize the science and the outcomes that were enabled by the study are particularly welcomed. Authors are encouraged to include mainstream science in their papers, thereby producing manuscripts that are substantial scientific well-rounded contributions that appeal to a broad community of readers and increase the profile of the authors.