Abstract
A new Haldane gap compound, Ni(dmpn) 2N 3(ClO 4) (dmpn=2,2-dimethyl-1,3-propanediamine) has been synthesized, and its structure and magnetic properties have been investigated. It has an azido-bridged linear-chain structure where each chain is separated to each other by counterions ClO 4 −. The Haldane gap and J value of this compound are estimated to be 21.6 K and −70.6 K, respectively. These absolute values are larger than those of Ni(en) 2(NO 2)(ClO 4) (hereafter abbreviated as NENP) which has a NO 2 −-bridged structure and has been extensively investigated so far.
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