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12 pages, 3826 KiB

Open AccessReview

Vibrational Coherence in the Metal–Metal-Bonded Excited State of Pt(II) Complexes

by Tengfei Yan and Qingyun Wan

Inorganics 2023, 11(11), 441; https://doi.org/10.3390/inorganics11110441 - 18 Nov 2023

Cited by 2 | Viewed by 2615

In the past decade, there have been significant advancements in the investigation of coherence-related phenomena in organic systems such as biological photosynthetic reaction centers. The d⁸ Pt(II) dinuclear complex or molecular aggregate with a metal–metal-to-ligand charge transfer (MMLCT) or metal-centered (MC) excited state was reported to show the vibrational coherence phenomenon in the intersystem crossing (ISC) process, due to the Metal–metal (M-M) interaction at excited state. In this study, we review the coherence effect in the Pt(II)-Pt(II) complexes which are speculated to be a coherent energy conversion system. The impacts of coherence on the photo-physics of Pt(II) dinuclear complexes have been discussed and reviewed, including the intersystem crossing process and vibrational wavepacket dynamics. Full article

(This article belongs to the Special Issue Phosphorescent Materials Based on Organometallic Complexes)

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9 pages, 5196 KiB

Open AccessCommunication

Single-Ion Magnetism in a Three-Dimensional Thiocyanate-Bridged Dysprosium(III) Framework

by Qingyun Wan, Mirosław Arczyński, Masanori Wakizaka, Shraddha Gupta, Nobuto Funakoshi and Masahiro Yamashita

Chemistry 2023, 5(2), 987-995; https://doi.org/10.3390/chemistry5020067 - 26 Apr 2023

Cited by 3 | Viewed by 2191

Abstract

New three-dimensional (3D) lanthanide framework compounds supported by bridging thiocyanate ligand and K⁺ cations, K₄[Ln(NCS)₄(H₂O)₄](NCS)₃(H₂O)₂(1: Ln = Dy, 2: Ln = Tb, 3: Ln = Gd) have been synthesized. A single-crystal X-ray diffraction study showed that all three compounds were isostructural and crystallized in the I 2/a space group. The K⁺ ion form 2D layers with thiocyanates which are further linked by [Ln(NCS)₄(H₂O)₄]^- complexes and additional thiocyanate ions to generate an interesting 3D framework structure. Compound 1 shows slow magnetic relaxation behavior under a zero direct current (DC) field, indicating that 1 behaves as a single-ion magnet (SIM). As estimated from AC magnetic measurements, the effective energy barrier for spin reversal in 1 was U_eff = 42 cm^–1. Slow relaxation of magnetization under a small external DC field was also detected for 2 and 3 at 1.8 K. Full article

(This article belongs to the Special Issue Coordination Chemistry: Current Developments and Future Perspectives — A Themed Issue in Honor of Professor Spyros P. Perlepes on the Occasion of His 70th Birthday)

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11 pages, 3423 KiB

Open AccessCommunication

A New Organic Conductor of Tetramethyltetraselenafulvalene (TMTSF) with a Magnetic Dy(III) Complex

by Qingyun Wan, Masanori Wakizaka, Haitao Zhang, Yongbing Shen, Nobuto Funakoshi, Chi-Ming Che, Shinya Takaishi and Masahiro Yamashita

Magnetochemistry 2023, 9(3), 77; https://doi.org/10.3390/magnetochemistry9030077 - 6 Mar 2023

Cited by 4 | Viewed by 2660

Abstract

A new molecular conductor of (TMTSF)₅[Dy(NCS)₄(NO₃)₂]CHCl₃ was prepared using the electrochemical oxidation method. The complex crystallizes in the Cmc2₁ (36) space group, where the partially-oxidized TMTSF molecules form a 1D (one-dimensional) column structure. The crystal shows a semiconducting behavior with a room temperature conductivity of 0.2 S·cm⁻¹ and an activation energy of 34 meV at ambient pressure. Full article

(This article belongs to the Special Issue Functional Molecular Materials Insights—a Themed Issue in Honour of Professor Manuel Almeida on the Occasion of His 70th Birthday)

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13 pages, 1027 KiB

Open AccessArticle

Reproducibility and Validity of a Semi-Quantitative Food Frequency Questionnaire for Assessing Dietary Intake of Vegetarians and Omnivores in Harbin, China

by Changbao Sun, Qingyun Wang, Cong Xu, Wan Wang, Jiage Ma, Liya Gu, Zhijing Liu, Juncai Hou and Zhanmei Jiang

Nutrients 2022, 14(19), 3975; https://doi.org/10.3390/nu14193975 - 24 Sep 2022

Cited by 7 | Viewed by 2845

Abstract

This study aims to evaluate the reproducibility and validity of a semi-quantitative food frequency questionnaire (SQFFQ) developed for vegetarians and omnivores in Harbin, China. Participants (36 vegetarians and 64 omnivores) administered SQFFQ at baseline (SQFFQ1) and six months later (SQFFQ2) to assess the reproducibility. The 24 h recalls (24 HRs) for three consecutive days were completed between the administrations of two SQFFQs to determine the validity. For reproducibility, Pearson correlation coefficients between SQFFQ1 and SQFFQ2 for vegetarians and omnivores were 0.45~0.88 and 0.44~0.84, respectively. For validity, unadjusted Pearson correlation coefficients were 0.46~0.83 with an average of 0.63 and 0.43~0.86 with an average of 0.61, respectively; energy-adjusted Pearson correlation coefficients were 0.43~0.82 with an average of 0.61 and 0.40~0.85 with an average of 0.59, respectively. Majority of the correlation coefficients for food groups and macronutrients decreased or remained unchanged after energy adjustment. Furthermore, all correlations were statistically significant (p < 0.05). Bland–Altman plots also showed reasonably acceptable agreement between the two methods. In conclusion, the SQFFQ developed in this study has reasonably acceptable reproducibility and validity. Full article

(This article belongs to the Section Nutrition Methodology & Assessment)

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19 pages, 3322 KiB

Open AccessArticle

Whole-Genome Sequence Analysis of Pseudorabies Virus Clinical Isolates from Pigs in China between 2012 and 2017 in China

by Ruiming Hu, Leyi Wang, Qingyun Liu, Lin Hua, Xi Huang, Yue Zhang, Jie Fan, Hongjian Chen, Wenbo Song, Wan Liang, Nengshui Ding, Zuohua Li, Zhen Ding, Xibiao Tang, Zhong Peng and Bin Wu

Viruses 2021, 13(7), 1322; https://doi.org/10.3390/v13071322 - 8 Jul 2021

Cited by 13 | Viewed by 6349

Abstract

Pseudorabies virus (PRV) is an economically significant swine infectious agent. A PRV outbreak took place in China in 2011 with novel virulent variants. Although the association of viral genomic variability with pathogenicity is not fully confirmed, the knowledge concerning PRV genomic diversity and evolution is still limited. Here, we sequenced 54 genomes of novel PRV variants isolated in China from 2012 to 2017. Phylogenetic analysis revealed that China strains and US/Europe strains were classified into two separate genotypes. PRV strains isolated from 2012 to 2017 in China are highly related to each other and genetically close to classic China strains such as Ea, Fa, and SC. RDP analysis revealed 23 recombination events within novel PRV variants, indicating that recombination contributes significantly to the viral evolution. The selection pressure analysis indicated that most ORFs were under evolutionary constraint, and 19 amino acid residue sites in 15 ORFs were identified under positive selection. Additionally, 37 unique mutations were identified in 19 ORFs, which distinguish the novel variants from classic strains. Overall, our study suggested that novel PRV variants might evolve from classical PRV strains through point mutation and recombination mechanisms. Full article

(This article belongs to the Special Issue Applications of Next-Generation Sequencing in Virus Discovery)

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