Defective metal string complex with one nickel(II) metal absent in center [Ni8(μ8-N9- 2pz)4Cl2](PF6)2 (2) was obtained on the basis a pyrazine and naphthyridine-containing triamino ligand N2-(pyrazin-2-yl)-N7-(7-(pyrazin-2-ylamino)-1, 8-naphthyridin-2-yl)-1, 8-naphthyridine- 2,7-diamine (H3N9-2pz) (1). The small J value (J = –2.96 cm–1) suggests quite a weak magnetic interaction throughout the molecule of complex 2. The weak magnetic interaction in defective complex indicates that the spin exchange in metal string occurs through the metal core rather than the bridging ligands.
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