Trinuclear Complexes of Nickel(II) and 4‐Amino‐1,2,4‐triazole

Abstract

Abstract. Nickel(II) tetrafluoroborate is capable of forming a variety of complexes with 4-amino-1,2,4-triazole (NH 2 trz), as NH 2 trz can coordinate to one, two, or three Ni 2+ ions and thus can give rise in particular to polynuclear compounds of "infinite" dimensions. From rather concentrated solutions in the presence of an excess of Ni 2+ , however, crystallization of the trinuclear compound [Ni 3 (NH 2 trz) 6 (H 2 O) 6 ](BF 4 ) 6 · 4H 2 O is observed. In this complex, adjacent nickel ions are connected with three bridging NH 2 trz ligands, and three water molecules are bound to each of the terminal nickel atoms. The Ni-N distances at the central Ni 2+ ion were found to exceed those at the terminal Ni 2+ ions, in account with the trans influence of the involved ligands. The dis-

Metal(II) triazole complexes: Synthesis, biological evaluation, and analytical characterization using machine learning-based validation

“…In monodentate coordi-nation, N1/N2 of the triazole ring is linked to the central metal atom. In bidentate coordination, N1 and N2 of the triazole ring were attached to the central metal atom [8,9]. Significant hydrogen bonding is facilitated by 1,2,4-triazole, which improves the medicinal qualities of drugs [10].…”

Investigations on spectroscopic characterizations, molecular docking, NBO, drug-Likeness, and ADME properties of 4H-1,2,4-triazol-4-amine by combined computational approach

“…4H-1,2,4-Triazol-4-amine (4-AHT), a nitrogen-rich ligand, has extremely versatile coordination behavior [13]. Therefore, existing research has focused on the spectroscopic properties, synthesis, and crystal structures of complexes containing the 4-AHT molecule.…”

“…A study by Dirtu [14] worked on the crystal structures and synthesis of Cu(II) [NH2trz] mononuclear complexes. In another study, the structure and spectroscopic properties of the Pt (II) complex of the 4-AHT molecule were investigated using various spectroscopic techniques (IR, 1 Hand 13 C-NMR, UV-Vis, and mass spectroscopy) [15].…”

Coordination Compounds of Palladium(II) and 4‐Amino‐1,2,4‐triazole

“…[9] Thus, for instance, crystallization of complexes of different metal-NH 2 trz ratio was reported in the same solution for silver(I) and NH 2 trz (with nitrate as counterion; however, the structure could be resolved only for one of the complexes). [9] As another peculiarity, in the case of tetrafluoroborate counter anions, partial hydrolysis of tetrafluoroborate can lead to generation of hexafluorosilicate by reaction of fluoride with silicon atoms of the glass walls of the reaction vessel, [14] thus leading to crystallization of NH 2 trz complexes containing both tetrafluoroborate and hexafluorosilicate anions. [5,14] So far, maybe somewhat surprising, mononuclear complexes with NH 2 trz have rarely been obtained.…”

“…[9] As another peculiarity, in the case of tetrafluoroborate counter anions, partial hydrolysis of tetrafluoroborate can lead to generation of hexafluorosilicate by reaction of fluoride with silicon atoms of the glass walls of the reaction vessel, [14] thus leading to crystallization of NH 2 trz complexes containing both tetrafluoroborate and hexafluorosilicate anions. [5,14] So far, maybe somewhat surprising, mononuclear complexes with NH 2 trz have rarely been obtained. Coordination com-ARTICLE pounds of platinum(II) and NH 2 trz of the composition [Pt(NH 2 trz) 4 ]X 2 ·nH 2 O crystallized with X = chloride (n = 2), nitrate (n = 0), or trifluoromethanesulfonate (n = 0).…”