95034-75-6

Upstream product

• 62787-29-5 N,N-bis(3-aminopropyl)-N',N'-dimethyl-1,2-diaminoethane 
• 98-59-9 p-toluenesulfonyl chloride 
• 67602-77-1 N,N-bis(2-cyanoethyl)-N',N'-dimethyl-1,2-diaminoethane 

Downstream Products

• 99474-73-4 {2-[9-Methanesulfonyl-5,13-bis-(toluene-4-sulfonyl)-1,5,9,13-tetraaza-cyclohexadec-1-yl]-ethyl}-dimethyl-amine 

Relevant academic research and scientific papers

Studies of Pendant-arm Macrocyclic Ligands. Part 1. Synthesis of Two New Penta-aza Ligands, and Observation of pH-Dependent Reversible Equilibria between Trigonal-bipyramidal and Square-planar Forms of their Nickel(II) and Copper(II) Complexes. Crystal Structure of a Trigonal-bipyrami...

Two new pendant-arm quinquedentate aza-macrocyclic ligands have been prepared, and their nickel(II) and copper(II) complexes found to undergo reversible rearrangements between approximately trigonal-bipyramidal structures at neutral pH, and protonated square-planar structures at low pH in which the pendant arms are protonated and non-co-ordinating.The crystal structure of 1>2 1 = 11-(2-dimethylaminoethyl)-1,4,7,11-tetra-azacyclotetradecane> establishes an approximately trigonal-bipyramidal geometry for the complex.Crystals are orthorhombic, space group Pna21, with a = 14.559(3), b = 15.337(3), c = 10.322(3) Angstroem, and Z = 4.The final R was 0.108 for 978 observed reflections with I/?(I) > 2.5.The axial N-Ni-N bond angle is 172(1) deg, and and the equatorial bond angles are 107(2), 107(1), and 144(2) deg.Ni-N distances range from 2.04(2) to 2.17(3) Angstroem.The nickel(II) and copper(II) complexes of L1 are isomorphous.