Mononuclear complexes of 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole containing tripodal tris(3-aminopropyl)amine: crystal structure of [Ni(trpn)(abpt)](ClO4)2

A Structural Investigation of Anion–Triazole Interactions: Observation of “π‐Pockets” and “π‐Sandwiches”

“…Both are quite long [F···centroid 3.304(7) and 3.492(9) Å], and may well be due to crystal packing forces rather than genuine anion-π interactions (so these are not considered further in the anion-π discussion below). This result quite surprising as other structures containing the ligand adpt have shown moderate anion-π inter- actions with ClO 4 anions (trz centroid···X 3.044 Å, [29] trz centroid···X 3.138 Å), [30] and we have recently observed extremely strong [trz centroid···X 2.790 (5) [31] In all four structures containing pldpt, one of the two anions in the asymmetric unit interacts with only one aromatic ring (Figures 4 and 5, Figures S7 and S8). In all cases, this is a triazole ring, and the interaction is strong [trz centroid···X 2.917(7)-3.005(10) Å, X = O for 2ClO 4 , X = F for 2BF 4 , 2PF 6 and 2SbF 6 ].…”

Effect of linear and non-linear pseudohalides on the structural and magnetic properties of Co(ii) hexacoordinate single-molecule magnets

“…25 These vibrations in 1-6 are found to be positively shifted, suggesting the coordination of the pyridine nitrogen atom to the metal atom. 26 In the spectra of 1-3, bands connected with the vibrations of water or methanol molecules were also observed.…”

Template synthesis and physicochemical studies of 14-membered hexaazmacrocyclic complexes with Co(II), Ni(II), Cu(II) and Zn(II): a comparative spectroscopic approach on DNA binding with Cu(II) and Ni(II) complexes

“…The 1 H-NMR spectra of the macrocyclic complexes 1d and 2d recorded in DMSO-d 6 solution show a broad signal in the region 6.09-6.12 ppm, which may correspond to the condensed secondary amino protons (-C-NH, 4H) of 1,2-phenylenediamine, while a signal in the region 4.30-4.32 ppm may be attributed to free primary amino protons (-C-NH 2, 4H) of 1,4-phenylenediamine [27]. A multiplet in the region 3.29-3.35 ppm may be assigned to the methylene protons (-N-CH 2 -N-, 8H) of the condensed aldehyde moiety.…”