Antiperovskite compounds Mn3Ag1-xCoxN （x =0.2, 0.5 and 0.8） are synthesized and the doping effect of the magnetic element Co at the Ag site is investigated. The crystal structure is not changed by the introduction o...Antiperovskite compounds Mn3Ag1-xCoxN （x =0.2, 0.5 and 0.8） are synthesized and the doping effect of the magnetic element Co at the Ag site is investigated. The crystal structure is not changed by the introduction of Co. However, with the increase of the content of Co, the spin reorientation gradually disappears and the antiferromagnetic transition changes to the ferromagnetic transition at the elevated temperature when x = 0.8. In addition, all of the magnetic phase transitions at the elevated temperature are always accompanied by the abnormal thermal expansion behaviors and an entropy change. Moreover, when x = 0.8, the coefficient of linear expansion is -1.89 × 10^-6 K^-1 （290-310K, △T =20 K）, which is generally considered as the low thermal expansion.展开更多
The supramolecular compound [(AgI3)(4-HBPFA)2(H2O)] (Mr = 1361.11) was synthesized via the reaction of 1,1?-bis[(4-pyridylamino)carbonyl]ferrocene (4-BPFA) with AgI, and structurally characterized by single-crystal X-...The supramolecular compound [(AgI3)(4-HBPFA)2(H2O)] (Mr = 1361.11) was synthesized via the reaction of 1,1?-bis[(4-pyridylamino)carbonyl]ferrocene (4-BPFA) with AgI, and structurally characterized by single-crystal X-ray diffraction analysis. Crystal data: monoclinic, space group C2/c, a = 1.6783(3), b = 10.646(2), c = 2.5419(5) ?, β = 93.66(3)o, V = 4532.2(16) ?3, Z = 4, Dc = 1.995 g/cm3, F(000) = 2632 and μ = 3.158 mm-1. The compound consists of (4- HBPFA)+, (AgI3)2- and H2O. In the structure, the adjacent (4-HBPFA)+ are linked by C–H…O and N–H…N hydrogen bonds into 1-D chains which are further linked by C–H…I and N–H…I hydrogen bonds as well as intermolecular π-π stacking interactions to form a 3-D supramolecular compound.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 51172012the Fundamental Research Funds for the Central Universities
文摘Antiperovskite compounds Mn3Ag1-xCoxN （x =0.2, 0.5 and 0.8） are synthesized and the doping effect of the magnetic element Co at the Ag site is investigated. The crystal structure is not changed by the introduction of Co. However, with the increase of the content of Co, the spin reorientation gradually disappears and the antiferromagnetic transition changes to the ferromagnetic transition at the elevated temperature when x = 0.8. In addition, all of the magnetic phase transitions at the elevated temperature are always accompanied by the abnormal thermal expansion behaviors and an entropy change. Moreover, when x = 0.8, the coefficient of linear expansion is -1.89 × 10^-6 K^-1 （290-310K, △T =20 K）, which is generally considered as the low thermal expansion.
基金This work was supported by the Outstanding Young Foundation of Henan Province
文摘The supramolecular compound [(AgI3)(4-HBPFA)2(H2O)] (Mr = 1361.11) was synthesized via the reaction of 1,1?-bis[(4-pyridylamino)carbonyl]ferrocene (4-BPFA) with AgI, and structurally characterized by single-crystal X-ray diffraction analysis. Crystal data: monoclinic, space group C2/c, a = 1.6783(3), b = 10.646(2), c = 2.5419(5) ?, β = 93.66(3)o, V = 4532.2(16) ?3, Z = 4, Dc = 1.995 g/cm3, F(000) = 2632 and μ = 3.158 mm-1. The compound consists of (4- HBPFA)+, (AgI3)2- and H2O. In the structure, the adjacent (4-HBPFA)+ are linked by C–H…O and N–H…N hydrogen bonds into 1-D chains which are further linked by C–H…I and N–H…I hydrogen bonds as well as intermolecular π-π stacking interactions to form a 3-D supramolecular compound.
