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Because of its versatile coordination modes and strong coordination ability, the mercaptoacetic acid substituted 1,2,4-triazole 2-{[5-(pyridin-2-yl)-4H-1,2,4-triazol-3-yl]sulfanyl}acetic acid (H2L) was synthesized and characterized. Treatment of H2L with cobalt and nickel acetate afforded the dinuclear complexes {μ-3-[(carboxylatomethyl)sulfanyl]-5-(pyridin-2-yl)-4H-1,2,4-triazol-4-ido-κ2 N 1,N 5:N 2,O}bis[aqua(methanol-κO)cobalt(II)] methanol disolvate, [Co2(C9H6N4O2S)2(CH3OH)2(H2O)2]·2CH3OH (1), and {μ-3-[(carboxylatomethyl)sulfanyl]-5-(pyridin-2-yl)-4H-1,2,4-triazol-4-ido-κ2 N 1,N 5:N 2,O}bis[diaquanickel(II)] methanol disolvate dihydrate, [Ni2(C9H6N4O2S)2(H2O)4]·2CH3OH·2H2O (2), respectively. Complex 1 crystallized in the monoclinic space group P21/c, while 2 crystallized in the tetragonal space group I41/a. Single-crystal X-ray diffraction studies revealed that H2L is doubly deprotonated and acts as a tetradentate bridging ligand in complexes 1 and 2. For both of the obtained complexes, extensive hydrogen-bond interactions contribute to the formation of their three-dimensional supermolecular structures. Hirshfeld surface analysis was used to illustrate the intermolecular interactions. Additionally, the urease inhibitory activities of 1, 2 and H2L were investigated against jack bean urease, where the two complexes revealed strong urease inhibition activities.

Eight new species of the Scaptodrosophila coracina species group are described from China: S. fuscilimba sp. n., S. fusciventricula sp. n., S. helvpecta sp. n., S. longispinata sp. n., S. nigrolimbata sp. n., S. trivittata sp. n., S. ventriobscurata sp. n., and S. zebrina sp. n. One known species S. coracina (Kikkawa & Peng) is redescribed. A key to all the examined species in the coracina group is provided. Species delimitations have been improved by integrating the DNA sequences with morphological information. The intra- and interspecific pairwise p-distances (proportional distance) are summarized. Some nucleotide sites with fixed status in the alignment of the COI sequences (662 nucleotide sites in length) are used as "pure" molecular diagnostic characters to delineate species in the coracina group.

Seven new species of the Scaptodrosophila brunnea species group are described from east Asia: S. maculata sp. n., S. melanogaster sp. n., S. nigricostata sp. n., S. nigripecta sp. n., S. obscurata sp. n., S. protenipenis sp. n. and S. rhina sp. n. Three known species, S. parabrunnea (Tsacas & Chassagnard), S. pressobrunnea (Tsacas & Chassagnard) and S. scutellimargo (Duda) are redescribed. A key to all the examined species in the brunnea group is provided. Species delimitations have been improved by integrating the DNA sequences with morphological information. The intra- and interspecific pairwise p-distances (proportional distance) are summarized. Some nucleotide sites with fixed status in the alignment of the COI sequences (664 nucleotide sites in length) are used as “pure” molecular diagnostic characters to delineate species in the brunnea group.

Seven new species of the Scaptodrosophila brunnea species group are described from east Asia: S. maculata sp. n., S. melanogaster sp. n., S. nigricostata sp. n., S. nigripecta sp. n., S. obscurata sp. n., S. protenipenis sp. n. and S. rhina sp. n. Three known species, S. parabrunnea (Tsacas & Chassagnard), S. pressobrunnea (Tsacas & Chassagnard) and S. scutellimargo (Duda) are redescribed. A key to all the examined species in the brunnea group is provided. Species delimitations have been improved by integrating the DNA sequences with morphological information. The intra- and interspecific pairwise p-distances (proportional distance) are summarized. Some nucleotide sites with fixed status in the alignment of the COI sequences (664 nucleotide sites in length) are used as “pure” molecular diagnostic characters to delineate species in the brunnea group.