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Co-crystallization of 4-hydroxyisophthalic acid (4-HIPA) with 2-methylpyrazine (MP), 2,3-dimethylpyrazine (DMP), and 2,3,5,6-tetramethylpyrazine (TMP) has been performed, resulting in the formation of three co-crystals 1 (MP:2(4-HIPA)), 2 (DMP:2(4-HIPA)), and 3 (TMP:2(4-HIPA)), respectively. The co-crystals were analyzed using single-crystal X-ray diffraction, infrared spectroscopy, thermogravimetric...
Investigations of spin-crossover in an iron(II) tris(diimine) system, based on the ligands L1 (4,5-dimethy-2-(pyridine-2-yl)imidazole) and L2 (1-acetic ethyl-2-(pyridine-2-yl)-imidazole), have been presented in this paper. The methyl groups at adjacent sites to the donor atoms in the ligand L1 generated the crossover situation for complexes Fe(L1)3(ClO4−)2 (1), Fe(L1)3(BF4−)2 (2), Fe(L1)3(PF6−)2 (3)...
Four new complexes, [Co(dmbpy)2(dca)2]·CH3OH (1), [Ni(dmbpy)2(dca)2]·CH3OH (2), [Zn(dmbpy)2(dca)2]·(3) and [Cu(dmbpy)2(OH)2]·5H2O (4) (dca=dicyanamide), derived from 4,4′-dimethyl-2,2′-bipyridine (dmbpy) have been synthesized and characterized by elemental analysis, TGA and single-crystal X-ray diffraction. Crystal structures and Hirshfeld surfaces analysis revealed that the complexes 1–3 were mainly...
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