Graphic abstract Kinetics between 5,10,15,20-tetrakis(N-methylpyridium-4-yl)porphyrin and Ni 2+ species were investigated in aqueous solution at 25 ±1 °C in I = 0.10 M (NaNO 3 ). Speciation of Ni 2+ was done in I = 0.10 M (NaNO 3 ) for knowing distribution of Ni 2+ species with solution pH. Experimental data were compared with speciation diagram constructed from the values of hydrolysis constants of Ni 2+ ion. Speciation data showed that hexaaquanickel(II) ions took place in hydrolysis reactions through formation of [Ni(OH 2 ) 6-n (OH) n ] 2-n species with solution pH. According to speciation of Ni 2+ and pH dependent rate constants, rate expression can be written as: d[Ni(TMPyP) 4+ ]/dt = ( k 1 [Ni 2+ (aq) ] + k 2 [Ni(OH) + (aq) ] + k 3 [Ni(OH) 2 o (aq) ] + k 4 [Ni(OH) 3 - (aq) ])[H 2 TMPyP 4+ ], where k 1 , k 2 , k 3 and k 4 were found to be k 1 = (0.62 ± 0.22) × 10 -2 ; k 2 = (3.60 ± 0.40) × 10 -2 ; k 3 = (2.09 ± 0.52) × 10 -2 , k 4 = (0.53 ± 0.04) × 10 -2 M -1 s -1 at 25 ±1 °C, respectively. Formation of hydrogen bonding between [Ni(H 2 O) 5 (OH)] + and [H 2 TMPyP] 4+ causes enhanced reactivity. Rate of formation of [Ni(II)TMPyP] 4+ complex was to be 3.99 × 10 -2 M -1 s -1 in I = 0.10 M, NaNO 3 (25 ± 1 °C). UV-Vis and fluorescence data suggested that [Ni(II)TMPyP] 4+ and [H 2 (TMPyP)] 4+ interact with DNA via outside binding with self-stacking and intercalation, respectively. SYNOPSIS Kinetics of tetrakis(1-methylpyridium-4-yl)porphyrin with Ni 2+ were studied in aqueous medium at 25 ±1 °C in ...

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A series of first-, second-, and third-generation dendronic triazolo-pyridazinones were synthesized in good yields via the Cu I -catalyzed azide-alkyne cycloaddition reactions of 4,6-diphenyl-2-(prop-2-yn-1-yl)pyridazin-3(2H)-one, possessing a terminal alkyne functional group with aromatic mono-and diazides with long alkyl and chiral glycol side-chain substituents. The chemical structures of the new compounds were characterized using different spectroscopic methods. The morphology of the dendrons was examined using the scanning electron microscope (SEM) analysis, which revealed the formation of highly ordered nanofiber and nanorod aggregations, directed by π-stacking interactions and van der Waals forces. Graphical abstractKeywords Dendron · Azide-alkyne cycloaddition · Self-assembly · Pyridazin-3(2H)-one · Nanofiber · Nanorod