1. Full name:     Thu Ha Nguyen             2. Sex: Female

3. Date of birth: September 11th, 1983    4. Place of birth: Thai Binh

5. Admission decision number: Decision No. 2875/QĐ-ĐHKHTN dated on August 7th, 2015 by the Rector of University of Science - Vietnam National University, Hanoi.

6. Changes in academic process:

Extended decision No. 2064/QĐ-ĐHKHTN dated on July 1st, 2019.

Extended decision No. 569/QĐ-ĐHKHTN dated on February 14th, 2020.

7. Official thesis title: Synthesis, structures, and magnetism of heteronuclear complexes with the chelating thiourea ligand.

8. Major: Inorganic chemistry                                                     9. Code: 9440112.01

10. Supervisors: Asso. Prof. Hung Huy Nguyen

11. Summary of the new findings of the thesis

- Successfully synthesized 18 heteronuclear complexes containing H2L ligand with 17 new substances, including: 6 complexes of LnZnL series, 10 complexes of LnMnL series, 01 complex of mixed valence [CuIICuI2L2]n and 01 complex [KCu2L2](PF6). The composition and structure of the complexes were determined by chemical, physical and physico-chemical methods. The 15 complexes were structurally determined by single-crystal X-ray diffraction.

- Successfully simulated the temperature dependence of molar magnetism for GdZnL and SmZnL complexes. The difference between simulated value and experimental value for GdZnL and SmZnL is R(χM) = 0.90%, R(χMT) = 1.20% and R(χM) = 0.09%, R (χMT) = 0.55%.

- Successfully simulated the temperature dependence of the molar magnetism for the LaMnL complex. The deviations R(χM) and R(χMT) are respectively 0.13% and 0.91%. The magnetic interactions in four LnMnL complexes were studied in detail (Ln = Sm, Nd, Gd and Dy). The results show that the interaction between Ln(III) (Ln = Sm, Nd) and Mn(II) is a weak ferromagnetic interaction, between Gd(III) and Mn(II) is a medium ferromagnetic interaction, and there is a strong ferromagnetic interaction between Dy(III) and Mn(II).

- The polymer structure of the [CuIICuI2L2]n complex was confirmed by single-crystal X-ray diffraction. This is the first mixed - covalent complex of H2L ligand to be published.

- Two structural forms of [KCu2L2](PF6) have been identified and the ability to exchange K+ ions in this complex with other alkali metal ions has been studied. Thereby, confirming the existence of complex series [MCu2L2](PF6) (M are alkali metals) with relative strength in the sequence in the following order: [KCu2L2]+ > [NaCu2L2]+ > [RbCu2L2 ]+ > [CsCu2L2]+ > [LiCu2L2]+.

- Successfully simulated the temperature dependence of the molar magnetism for the [KCu2L2](PF6)-a complex. In which, the interaction between Cu(II)-Cu(II) is antiferromagnetic and the interaction between [KCu2L2]+ units is ferromagnetic. The deviation R(χM) and R(χMT) between simulated and experimental results are respectively 0.98% and 2.97%.

12. Paratical applicability, if any:

The heteronuclear complex has wide applications in the fabrication of advanced materials such as magnetic materials, luminescent materials, host-guest materials and dual-function catalysis. Magnetic research of heteronuclear complexes is a new research direction in Vietnam. The results of the thesis will be a premise for research groups to expand the study of magnetism of complexes with different ligand systems.

13. Further research directions, if any: Study on fabrication of magnetic materials based on heteronuclear complexes containing cyclic thioure ligands.

14. Thesis-related publications:

[1] Thu Ha Nguyen, Thi Thom Thieu, Tran Tam Nguyen, Chien Thang Pham, Hung Huy Nguyen (2017), “Synthesis and structural investigation of mixed-metal complex of Mn2+ and Pr3+ with 2,6-pyridine dicarbonyl bis(N,N-diethylthiourea)”, Viet Nam Journal of Chemistry 5(e12), page. 232-235.

[2] Thu Ha Nguyen, Thi Bich Ngoc Vu, Thi Huong Hue Hoang, Hung Huy Nguyen (2018), “Synthesis and structural study of a mixed metal complex of Mn(II) , Tb(III) with dipi olinoyl-2,6-bis(N,N-diethylthiourea) ligand”, Viet Nam Journal of Chemistry 56(6E2), page. 186-189.

[3] Thu Ha Nguyen, Ngoc Thanh Nguyen, Hung Huy Nguyen (2019), “Structural study of heteronuclear complexes of Mn2+/Ce3+ and dipicolinoyl-2,6-bis(N,N-diethylthiourea)”, Viet Nam Journal of Chemistry 57(2E12), page. 85-89.

[4] Chien Thang Pham, Thu Ha Nguyen, Thi Nguyet Trieu, Kenji Matshumoto, Hung Huy Nguyen (2019), “Syntheses, Structures and Magnetism of Trinuclear Zn2Ln Complexes with 2,6-Dipicolinoylbis(N,N-diethylthiourea)”, Journal of Inorganic and General Chemistry, pp. 1072-1078.

[5] Chien Thang Pham, Thu Ha Nguyen, Kenji Matsumoto,  Hung Huy Nguyen (2019), “Cu(I)/Cu(II) complexes with Dipicolinoylbis(N,N-diethylthiourea): Structures, Magnetism  and Guest Ion Exchange”, European Journal of Inorganic Chemistry 38, pp. 4142-4146.