高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (1): 20230400.doi: 10.7503/cjcu20230400
收稿日期:
2023-09-07
出版日期:
2024-01-10
发布日期:
2023-11-10
通讯作者:
何运良
E-mail:heyunliang@bipt.edu.cn
LIU Qi1, LIU Moyi2, DONG Siyu3, WANG Xuezhong1, HE Yunliang1()
Received:
2023-09-07
Online:
2024-01-10
Published:
2023-11-10
Contact:
HE Yunliang
E-mail:heyunliang@bipt.edu.cn
摘要:
研究了利格列汀复杂的晶型现象及其晶格中的构象变化. 通过培养利格列汀的单晶并进行X射线单晶衍射分析, 首次得到了包括晶型A在内的3种晶体结构; 结合文献已报道的2种晶体结构, 分析了各晶体结构的特点及其晶格中的分子构象. 研究结果表明, 5种晶体里存在晶型A和晶型F两种晶型, 其中晶型F为准多晶型, 可以包含多种溶剂, 形成通道型溶剂合物, 其晶格参数随包含的溶剂略有变化. 晶型A的构象与晶型F的构象存在较高能垒, 导致2种晶型难以互相转化. 晶型F不同溶剂合物之间的分子构象并不完全相同, 在粉末X射线衍射(PXRD)谱图上也有显著差异. 最后, 通过混悬转晶和热分析等方法研究了晶型之间的转化关系.
中图分类号:
TrendMD:
刘奇, 刘沫毅, 董思雨, 王学重, 何运良. 利格列汀多晶型研究. 高等学校化学学报, 2024, 45(1): 20230400.
LIU Qi, LIU Moyi, DONG Siyu, WANG Xuezhong, HE Yunliang. Study on the Polymorphism of Linagliptin. Chem. J. Chinese Universities, 2024, 45(1): 20230400.
Compound | A | F⁃W[ | F⁃OH[ | F⁃DCM | F⁃DS |
---|---|---|---|---|---|
Form | Anhydrate | Dihydrate | MeOH EtOH solvate | DCM solvate | Anhydrate |
Empirical formula | C25H28N8O2 | C25H28N8O2·2H2O | C25H28N8O2· (C2H6O)0.5·(CH4O)0.5 | C25H28N8O2·CH2Cl2 | C25H28N8O2 |
Space group | P21/c | P21212 | P21212 | P21212 | P21212 |
a/nm | 1.60004(5) | 2.16488(10) | 2.1663(2) | 2.14400(5) | 2.17458(9) |
b/nm | 1.70056(6) | 2.47873(12) | 2.4777(2) | 2.44430(5) | 2.46922(12) |
c/nm | 1.80549(7) | 0.96891(4) | 0.97428(7) | 1.00323(2) | 0.97015(4) |
α/(°) | 90 | 90 | 90 | 90 | 90 |
β/(°) | 100.46 | 90 | 90 | 90 | 90 |
γ/(°) | 90 | 90 | 90 | 90 | 90 |
Volume/nm3 | 4.83103 | 5.19932 | 5.22939 | 5.25751 | 5.20924 |
Z, Z' | 8, 2 | 8, 2 | 4, 1 | 8, 2 | 8, 2 |
Table 1 Comparison of five crystal structures of linagliptin
Compound | A | F⁃W[ | F⁃OH[ | F⁃DCM | F⁃DS |
---|---|---|---|---|---|
Form | Anhydrate | Dihydrate | MeOH EtOH solvate | DCM solvate | Anhydrate |
Empirical formula | C25H28N8O2 | C25H28N8O2·2H2O | C25H28N8O2· (C2H6O)0.5·(CH4O)0.5 | C25H28N8O2·CH2Cl2 | C25H28N8O2 |
Space group | P21/c | P21212 | P21212 | P21212 | P21212 |
a/nm | 1.60004(5) | 2.16488(10) | 2.1663(2) | 2.14400(5) | 2.17458(9) |
b/nm | 1.70056(6) | 2.47873(12) | 2.4777(2) | 2.44430(5) | 2.46922(12) |
c/nm | 1.80549(7) | 0.96891(4) | 0.97428(7) | 1.00323(2) | 0.97015(4) |
α/(°) | 90 | 90 | 90 | 90 | 90 |
β/(°) | 100.46 | 90 | 90 | 90 | 90 |
γ/(°) | 90 | 90 | 90 | 90 | 90 |
Volume/nm3 | 4.83103 | 5.19932 | 5.22939 | 5.25751 | 5.20924 |
Z, Z' | 8, 2 | 8, 2 | 4, 1 | 8, 2 | 8, 2 |
Form | A | F⁃W | F⁃OH | F⁃DCM | F⁃DS |
---|---|---|---|---|---|
Relative volume of lattice(%) | 100 | 107.6 | 108.2 | 108.8 | 107.8 |
Void volume/nm3 | 0 | 0.6956 | 0.7541 | 0.7910 | 0.6804 |
Void percentage(%) | 0 | 13.4 | 14.4 | 15.0 | 13.1 |
Table 2 Comparison of cell volume and void in five crystal structures
Form | A | F⁃W | F⁃OH | F⁃DCM | F⁃DS |
---|---|---|---|---|---|
Relative volume of lattice(%) | 100 | 107.6 | 108.2 | 108.8 | 107.8 |
Void volume/nm3 | 0 | 0.6956 | 0.7541 | 0.7910 | 0.6804 |
Void percentage(%) | 0 | 13.4 | 14.4 | 15.0 | 13.1 |
A | F⁃DS | F⁃DCM | F⁃W | F⁃OH | |||||
---|---|---|---|---|---|---|---|---|---|
2θ/(°) | I(%) | 2θ/(°) | I(%) | 2θ/(°) | I(%) | 2θ/(°) | I(%) | 2θ/(°) | I(%) |
7.2 | 26.4 | 7.2 | 100 | 7.2 | 1.5 | 7.1 | 100 | 7.1 | 75.7 |
7.6 | 100 | 8.1 | 24.9 | 8.2 | 20.9 | 8.2 | 37.6 | 8.2 | 29.5 |
8.6 | 17.8 | 8.9 | 67.7 | 9.4 | 49.6 | 8.9 | 36.0 | 8.9 | 26.5 |
11.7 | 30.3 | 9.8 | 15.7 | 10.3 | 100 | 9.8 | 24.4 | 9.7 | 27.9 |
12.4 | 46.7 | 10.6 | 32.9 | 15.5 | 79.5 | 10.6 | 76.5 | 10.6 | 79.2 |
23.2 | 28.8 | 13.5 | 36.8 | 16.8 | 51.0 | 14.1 | 54.4 | 14.0 | 94.1 |
25.3 | 26.9 | 14.1 | 35.3 | 21.8 | 97.0 | 21.8 | 81.6 | 16.7 | 79.4 |
25.8 | 27.0 | 21.8 | 20.0 | 23.5 | 88.7 | 23.6 | 67.7 | 21.8 | 100 |
Table 3 Comparison of characteristic peaks and relative intensities of each crystal
A | F⁃DS | F⁃DCM | F⁃W | F⁃OH | |||||
---|---|---|---|---|---|---|---|---|---|
2θ/(°) | I(%) | 2θ/(°) | I(%) | 2θ/(°) | I(%) | 2θ/(°) | I(%) | 2θ/(°) | I(%) |
7.2 | 26.4 | 7.2 | 100 | 7.2 | 1.5 | 7.1 | 100 | 7.1 | 75.7 |
7.6 | 100 | 8.1 | 24.9 | 8.2 | 20.9 | 8.2 | 37.6 | 8.2 | 29.5 |
8.6 | 17.8 | 8.9 | 67.7 | 9.4 | 49.6 | 8.9 | 36.0 | 8.9 | 26.5 |
11.7 | 30.3 | 9.8 | 15.7 | 10.3 | 100 | 9.8 | 24.4 | 9.7 | 27.9 |
12.4 | 46.7 | 10.6 | 32.9 | 15.5 | 79.5 | 10.6 | 76.5 | 10.6 | 79.2 |
23.2 | 28.8 | 13.5 | 36.8 | 16.8 | 51.0 | 14.1 | 54.4 | 14.0 | 94.1 |
25.3 | 26.9 | 14.1 | 35.3 | 21.8 | 97.0 | 21.8 | 81.6 | 16.7 | 79.4 |
25.8 | 27.0 | 21.8 | 20.0 | 23.5 | 88.7 | 23.6 | 67.7 | 21.8 | 100 |
Molecular conformer | α/(°) | β/(°) | γ/(°) | δ/(°) | ΔE/(kJ·mol-1) |
---|---|---|---|---|---|
A⁃R | -6.3 | 89.1 | -58.2 | -95.8 | 895.0 |
A⁃L | -7.0 | -76.3 | 176.3 | -113.2 | 292.8 |
F⁃DCM⁃L | -17.5 | -67.1 | -56.5 | -96.7 | 0 |
F⁃DCM⁃R | 22.0 | 68.5 | 63.7 | 97.2 | 4.3 |
F⁃DS⁃L | -26.6 | -66.0 | -63.9 | -98.2 | 337.6 |
F⁃DS⁃R | 23.7 | 66.1 | 55.9 | 100.7 | 338.8 |
F⁃OH⁃L | -21.8 | -67.0 | -57.0 | -101.1 | 776.2 |
F⁃OH⁃R | 26.6 | 65.4 | 63.5 | 97.4 | 783.6 |
F⁃W⁃L | 158.3 | -66.2 | -56.5 | -100.7 | 285.8 |
F⁃W⁃R | 26.7 | 65.4 | 62.8 | 97.6 | 260.3 |
Table 4 Comparison of torsion angles of conformers in five crystal lattices
Molecular conformer | α/(°) | β/(°) | γ/(°) | δ/(°) | ΔE/(kJ·mol-1) |
---|---|---|---|---|---|
A⁃R | -6.3 | 89.1 | -58.2 | -95.8 | 895.0 |
A⁃L | -7.0 | -76.3 | 176.3 | -113.2 | 292.8 |
F⁃DCM⁃L | -17.5 | -67.1 | -56.5 | -96.7 | 0 |
F⁃DCM⁃R | 22.0 | 68.5 | 63.7 | 97.2 | 4.3 |
F⁃DS⁃L | -26.6 | -66.0 | -63.9 | -98.2 | 337.6 |
F⁃DS⁃R | 23.7 | 66.1 | 55.9 | 100.7 | 338.8 |
F⁃OH⁃L | -21.8 | -67.0 | -57.0 | -101.1 | 776.2 |
F⁃OH⁃R | 26.6 | 65.4 | 63.5 | 97.4 | 783.6 |
F⁃W⁃L | 158.3 | -66.2 | -56.5 | -100.7 | 285.8 |
F⁃W⁃R | 26.7 | 65.4 | 62.8 | 97.6 | 260.3 |
Fig.8 Potential energy surface of linagliptin as a function of torsion angle β(A), α(B), γ(C) and δ(D)A-R; F-DCM; F-DS-R; F-OH-R; F-W-R; A-L; F-DCM-L; F-DS-L; F-OH-L; F-W-L.
No. | Solvent | Experimental detail | Form |
---|---|---|---|
1 | 2 v* DCM and 3 v EA | Stirring at room temperature(r.t.) for 24 h after dissolved clearly | F⁃DCM |
2 | 0.5 v DCM and 5 v EA | Suspend Form A in solution for 48 h at room temperature. | F⁃DCM |
3 | 1 v MeOH and 7.5 v TBA | Suspend Form A in solution for 72 h at room temperature | F⁃OH |
4 | 7.5 v EtOH | Suspend Form A in solution for 12 h at room temperature | F⁃OH |
5 | 2.5 v THF and 3 v EA | Add EA to clear THF solution and stirring for10 h at room temperature | A |
Table 5 Preparation of forms A and F
No. | Solvent | Experimental detail | Form |
---|---|---|---|
1 | 2 v* DCM and 3 v EA | Stirring at room temperature(r.t.) for 24 h after dissolved clearly | F⁃DCM |
2 | 0.5 v DCM and 5 v EA | Suspend Form A in solution for 48 h at room temperature. | F⁃DCM |
3 | 1 v MeOH and 7.5 v TBA | Suspend Form A in solution for 72 h at room temperature | F⁃OH |
4 | 7.5 v EtOH | Suspend Form A in solution for 12 h at room temperature | F⁃OH |
5 | 2.5 v THF and 3 v EA | Add EA to clear THF solution and stirring for10 h at room temperature | A |
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