Unusual magnetic properties of one-dimensional molecule-based magnets associated with a structural phase transition

Xiaoming Ren; Qingjin Meng; You Song; Changsheng Lu; Chuanjiang Hu; Xiaoyuan Chen

doi:10.1021/ic0111637

Unusual magnetic properties of one-dimensional molecule-based magnets associated with a structural phase transition

Xiaoming Ren, Qingjin Meng, You Song, Changsheng Lu, Chuanjiang Hu, Xiaoyuan Chen

Research output: Contribution to journal › Article › peer-review

208 Scopus citations

Abstract

Three ion-pair complexes, [RbzPy]⁺[Ni(mnt)₂]^- (mnt^2- = maleonitriledithiolate; [RbzPy]⁺ = 4-R-benzylpyridinium; R = Br (1), Cl (2), and NO₂ (3)), with unusual magnetic properties have been synthesized and characterized. The crystal structures of 1 and 2 have been solved. The two complexes belong to the P2₁/c space group with Z = 4 and C₂₀H₁₁BrN₅NiS₄, a = 12.0744(17) Å, b = 26.369(4) Å, c = 7.440(3) Å, and β = 102.63(3)° for 1 and C₂₀H₁₁- CIN₅NiS₄, a = 12.105(2) Å, b = 26.218(4) Å, c = 7.374(2) Å, and β = 102.55(2)° for 2, respectively. The [Ni(mnt)₂]^- anions in 1-3 form uniformly spaced one-dimensional (1-D) magnetic chains of s = 1/2 at room temperature. The temperature dependences of the susceptibility for 1-3 show that they undergo phase transitions. All three complexes are paramagnetic in their high-temperature (abbreviation HT) phase and diamagnetic in the low-temperature (abbreviation LT) phase because of strong dimerization along the stacking direction. The results of thermal analysis (DSC) further confirm that the phase transition for 1 and 2 is first-order but maybe second-order for 3. The phenomena observed in this study are similar to those of the 1-D radical systems.

Original language	English
Pages (from-to)	5686-5692
Number of pages	7
Journal	Inorganic Chemistry
Volume	41
Issue number	22
DOIs	https://doi.org/10.1021/ic0111637
State	Published - 4 Nov 2002
Externally published	Yes

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@article{7a7367f1bf2f41dd821f3d3e98af6de2,

title = "Unusual magnetic properties of one-dimensional molecule-based magnets associated with a structural phase transition",

abstract = "Three ion-pair complexes, [RbzPy]+[Ni(mnt)2]- (mnt2- = maleonitriledithiolate; [RbzPy]+ = 4-R-benzylpyridinium; R = Br (1), Cl (2), and NO2 (3)), with unusual magnetic properties have been synthesized and characterized. The crystal structures of 1 and 2 have been solved. The two complexes belong to the P21/c space group with Z = 4 and C20H11BrN5NiS4, a = 12.0744(17) {\AA}, b = 26.369(4) {\AA}, c = 7.440(3) {\AA}, and β = 102.63(3)° for 1 and C20H11- CIN5NiS4, a = 12.105(2) {\AA}, b = 26.218(4) {\AA}, c = 7.374(2) {\AA}, and β = 102.55(2)° for 2, respectively. The [Ni(mnt)2]- anions in 1-3 form uniformly spaced one-dimensional (1-D) magnetic chains of s = 1/2 at room temperature. The temperature dependences of the susceptibility for 1-3 show that they undergo phase transitions. All three complexes are paramagnetic in their high-temperature (abbreviation HT) phase and diamagnetic in the low-temperature (abbreviation LT) phase because of strong dimerization along the stacking direction. The results of thermal analysis (DSC) further confirm that the phase transition for 1 and 2 is first-order but maybe second-order for 3. The phenomena observed in this study are similar to those of the 1-D radical systems.",

author = "Xiaoming Ren and Qingjin Meng and You Song and Changsheng Lu and Chuanjiang Hu and Xiaoyuan Chen",

year = "2002",

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doi = "10.1021/ic0111637",

language = "英语",

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pages = "5686--5692",

journal = "Inorganic Chemistry",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Unusual magnetic properties of one-dimensional molecule-based magnets associated with a structural phase transition

AU - Ren, Xiaoming

AU - Meng, Qingjin

AU - Song, You

AU - Lu, Changsheng

AU - Hu, Chuanjiang

AU - Chen, Xiaoyuan

PY - 2002/11/4

Y1 - 2002/11/4

N2 - Three ion-pair complexes, [RbzPy]+[Ni(mnt)2]- (mnt2- = maleonitriledithiolate; [RbzPy]+ = 4-R-benzylpyridinium; R = Br (1), Cl (2), and NO2 (3)), with unusual magnetic properties have been synthesized and characterized. The crystal structures of 1 and 2 have been solved. The two complexes belong to the P21/c space group with Z = 4 and C20H11BrN5NiS4, a = 12.0744(17) Å, b = 26.369(4) Å, c = 7.440(3) Å, and β = 102.63(3)° for 1 and C20H11- CIN5NiS4, a = 12.105(2) Å, b = 26.218(4) Å, c = 7.374(2) Å, and β = 102.55(2)° for 2, respectively. The [Ni(mnt)2]- anions in 1-3 form uniformly spaced one-dimensional (1-D) magnetic chains of s = 1/2 at room temperature. The temperature dependences of the susceptibility for 1-3 show that they undergo phase transitions. All three complexes are paramagnetic in their high-temperature (abbreviation HT) phase and diamagnetic in the low-temperature (abbreviation LT) phase because of strong dimerization along the stacking direction. The results of thermal analysis (DSC) further confirm that the phase transition for 1 and 2 is first-order but maybe second-order for 3. The phenomena observed in this study are similar to those of the 1-D radical systems.

AB - Three ion-pair complexes, [RbzPy]+[Ni(mnt)2]- (mnt2- = maleonitriledithiolate; [RbzPy]+ = 4-R-benzylpyridinium; R = Br (1), Cl (2), and NO2 (3)), with unusual magnetic properties have been synthesized and characterized. The crystal structures of 1 and 2 have been solved. The two complexes belong to the P21/c space group with Z = 4 and C20H11BrN5NiS4, a = 12.0744(17) Å, b = 26.369(4) Å, c = 7.440(3) Å, and β = 102.63(3)° for 1 and C20H11- CIN5NiS4, a = 12.105(2) Å, b = 26.218(4) Å, c = 7.374(2) Å, and β = 102.55(2)° for 2, respectively. The [Ni(mnt)2]- anions in 1-3 form uniformly spaced one-dimensional (1-D) magnetic chains of s = 1/2 at room temperature. The temperature dependences of the susceptibility for 1-3 show that they undergo phase transitions. All three complexes are paramagnetic in their high-temperature (abbreviation HT) phase and diamagnetic in the low-temperature (abbreviation LT) phase because of strong dimerization along the stacking direction. The results of thermal analysis (DSC) further confirm that the phase transition for 1 and 2 is first-order but maybe second-order for 3. The phenomena observed in this study are similar to those of the 1-D radical systems.

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U2 - 10.1021/ic0111637

DO - 10.1021/ic0111637

M3 - 文章

C2 - 12401072

AN - SCOPUS:0037020806

SN - 0020-1669

VL - 41

SP - 5686

EP - 5692

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 22

ER -

Unusual magnetic properties of one-dimensional molecule-based magnets associated with a structural phase transition

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