Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Application In Synthesis of N1-(3-Aminopropyl)-N1-methylpropane-1,3-diamine, Which mentioned a new discovery about 105-83-9
Six new nickel(II) binuclear oxalato-bridging compounds were obtained and crystal structures were solved at room temperature. Factors influencing the nitrite coordination modes are discussed. [mer-Ni2(3,3?-diamino-N-methyldipropylamine) 2(OH2)2(mu-OX)]Cl2·3H 2O (I), Ni2C16Cl2H48N6O 9 is a mu-oxalato bridged dimer with a Medpt ligands in the mer conformation, a nitro(N) ligand trans to the N-methyl group and a water ligand trans to an oxalato oxygen. Green [fac-Ni2(3,3?-diamino-N-methyldipropylamine) 2(ONO)2(mu-OX)] (II), Ni2C16H38N8O8 is also a mu-oxalato bridged dimer with a fac-Medpt, making this substance unique since it is the only fac-dpt compound ever made. The nitro(O) ligand is trans to the N-methyl group. Violet [mer-Ni2(3,3?-diamino-N-methyldipropylamine) 2(NO2)2(mu-OX)]·2H2O (III), Ni2C16H42N8O10 is interesting as this compound came from the same reaction pot as II. The two are readily separated by hand since their colors differ drastically. It is also a mu-oxalato bridged dimer with mer-Medpt but the nitro ligand is (O) bound and trans to an oxalato oxygen. [mer-Ni2(N-(3-aminopropyl)-1,3-propanediamine)2(OH 2)2(mu-OX)]Cl2 (IV), Ni2C14Cl2H38N6O 6 is also a mu-oxalato bridged dimer with an unmethylated dpt ligand in mer conformation. The sixth position of the coordination sphere is a water located trans to an oxalato oxygen. [mer-Ni2(N-(3-aminopropyl)-1,3-propanediamine)2(OH 2)2(mu-OX)]Cl(NO2) (V), Ni2C14ClH38N7O8. The amine ligand of both nickels are mer, an oxalato bridge links the two metal centers and a water occupies a site trans to an oxalato oxygen. It is surprising to find a nitro ligand as a counter ion while a water occupies a coordination site. Normally, one would expect displacement of the aquo ligand by NO2-. [mer-Ni2(N-(2-aminoethyl)-1,3-propanediamine)2(OH 2)2(mu-OX)](ClO4)2 (VI), Ni2C12Cl2H34N6O 14. The mer-aep and the mu-oxalato ligands fill five positions of the coordination sphere of this dimer. The other positions are taken up by water molecules located trans to an oxalato oxygen. The structures of all six compounds were determined and the temperature dependence of their magnetic susceptibility were also established.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI