TY - JOUR
T1 - Structures of flexible supramolecular cations (1,4-cyclohexanediammonium 2+)(crown ethers) 2 in [Ni(dmit) 2] - salts
AU - Akutagawa, T.
AU - Hashimoto, A.
AU - Nishihara, S.
AU - Hasegawa, T.
AU - Nakamura, T.
N1 - Funding Information:
This work was partly supported by a Grant-in-Aid for Science Research from the Ministries of Education, Culture, Sports, Science, and Technology of Japan. The authors thank Dr. K. Ichimura and Prof. K. Nomura for allowing the use of their SQUID magnetometer.
PY - 2002/1
Y1 - 2002/1
N2 - Supramolecular dication structures, (CHDA 2+)(crown ethers) and (CHDMA 2+)(crown ethers) complexes, were introduced as counter cations to [Ni(dmit) 2] - anions (S=1/2 spin) (CHDA 2+=trans-1,4-cyclohexanediammonium; CHDMA 2+=1,4-bis(methylammonium)cyclohexane; dmit 2-=2-thioxo-1,3-dithiole-4,5-dithiolate; crown ethers=[12]crown-4, [15]crown-5, or [18]crown-6). The cyclohexane rings, with the -NH 3 + or -CH 2-NH 3 + substituents at trans-1,4-positions, arrange into the crown ethers complexes within the [Ni(dmit) 2] - salts. The cyclohexane rings adopt chair conformations, resulting in sandwich-type (CHDA 2+ or CHDMA 2+)(crown ethers) 2 structures, through N-H... O hydrogen-bonding interactions within the crystals between the ammonium moieties of cations (-NH 3 + or -CH 2-NH 3 +) and the oxygen atoms of the crown ethers. Formations of π-π dimer structures of [Ni(dmit) 2] - anions were observed in all salts. The selections of the dication structures (CHDA 2+ or CHDMA 2+) and the crown ethers, due to the various ring sizes, can influence the intra and interdimer interactions of the [Ni(dmit) 2] - anions in the crystals.
AB - Supramolecular dication structures, (CHDA 2+)(crown ethers) and (CHDMA 2+)(crown ethers) complexes, were introduced as counter cations to [Ni(dmit) 2] - anions (S=1/2 spin) (CHDA 2+=trans-1,4-cyclohexanediammonium; CHDMA 2+=1,4-bis(methylammonium)cyclohexane; dmit 2-=2-thioxo-1,3-dithiole-4,5-dithiolate; crown ethers=[12]crown-4, [15]crown-5, or [18]crown-6). The cyclohexane rings, with the -NH 3 + or -CH 2-NH 3 + substituents at trans-1,4-positions, arrange into the crown ethers complexes within the [Ni(dmit) 2] - salts. The cyclohexane rings adopt chair conformations, resulting in sandwich-type (CHDA 2+ or CHDMA 2+)(crown ethers) 2 structures, through N-H... O hydrogen-bonding interactions within the crystals between the ammonium moieties of cations (-NH 3 + or -CH 2-NH 3 +) and the oxygen atoms of the crown ethers. Formations of π-π dimer structures of [Ni(dmit) 2] - anions were observed in all salts. The selections of the dication structures (CHDA 2+ or CHDMA 2+) and the crown ethers, due to the various ring sizes, can influence the intra and interdimer interactions of the [Ni(dmit) 2] - anions in the crystals.
KW - Crown ether
KW - Cyclohexane
KW - Magnetism
KW - Supramolecular cation
KW - [Ni(dmit) ]
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U2 - 10.1016/S1472-7862(03)00007-8
DO - 10.1016/S1472-7862(03)00007-8
M3 - Article
AN - SCOPUS:0042627978
VL - 2
SP - 175
EP - 186
JO - Journal of Supramolecular Chemistry
JF - Journal of Supramolecular Chemistry
SN - 1472-7862
IS - 1-3
ER -