2,2 ,2’’-Terpyridyl tris amine

Chromium(II) complexes of bipyridyls, terpyridyl and the phenanthrolines have been discussed in Section 35.2.2.1. Complexes of the ligands 2-aminomethylpyridine (pic, 2-picolyl-amine) and 8-aminoquinoline (amq), which have one heterocyclic and one amino nitrogen donor atom, have been prepared by methods similar to those in Scheme 10. The bis(amine) complexes are typical high-spin, distorted octahedral complexes, and the mono(amine) complexes, from their antiferromagnetic behaviour and reflectance spectra, are six-coordinate, halide-bridged polymers (Table 15).103 No tris(amine) complexes could be prepared so the attempt to find spin isomeric systems in octahedral chromium(II) systems was unsuccessful ([Cr(en)3]X2 are high-spin and [Cr(bipy)3]X3 and [CrX2(bipy)2] low-spin). 

SDS = sodium dodecyl sulfate tacn= 1,4,7-triazacyclononane terpy = 2,2, 6, 2"-terpyridyl, (72) tpa = tris(2-pyridylmethyl)amine, (58) tpp = tetraphenylporphyrin... 

Another type of tri-imine complexes containing terpyridyl type ligands, in which the inner pyridyl ring has been replaced by an amino moiety, such as di-(2-pyridylmethyl)-amine (dpma) and di-(2-pyridylmethyl)methylamine (medpma) has been described... 

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