Abstract
Novel organic polyradicals, BIP-BNO and BIP-TENO, are synthesized and crystallized to form ladder systems, where BIP-BNO and BIP-TENO denote 3,5'-bis(N-tert-butylaminoxyl)-3',5'-dibromobiphenyl and 3,3',5,5'-tetrakis(N-tert-butylaminoxyl)biphenyl, respectively. The BIP-BNO crystals form a two-leg ladder of S=1/2 with antiferromagnetic legs and rungs. The BIP-TENO crystals can be regarded as a two-leg ladder of S=1 species. The magnetic measurements revealed that both compound have singlet ground states.
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