Diaminotriazine-substituted nitronyl nitroxide: a novel building block for organic magnets having multiple hydrogen bonding substituents as structure-determining supramolecular synthons?

CrystEngComm Pub Date: 2009-09-11 DOI: 10.1039/B909757K

Abstract

As a novel radical building block possessing multiple hydrogen bond functionality, we have designed and synthesised diaminotriazine-substituted nitronyl nitroxide (DAT-NN; 1). The diaminotriazine moiety of 1 forms two kinds of hydrogen bonding and molecule 1 forms an S = 1/2 uniform antiferromagnetic Heisenberg chain with the exchange interaction of J/kB = ?15.3 K in the crystalline solid, which is attributable to close contacts between the nitronyl nitroxide oxygen atoms. 1H-ENDOR spectroscopy has shown that the triazine moiety has little significant spin density. Thus, the diaminotriazine moiety plays a role primarily in determining the molecular packing instead of propagating intermolecular magnetic interactions in the crystalline solid.

Graphical abstract: Diaminotriazine-substituted nitronyl nitroxide: a novel building block for organic magnets having multiple hydrogen bonding substituents as structure-determining supramolecular synthons
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