Abstract
Controlled synthesis of transition metal complexes with mixed ligands has led to two new compounds with the same empirical formula Fe(N3)2(4,4′-bpy)] (4,4′-bpy = 4,4′-bipyridine). The compound 2D-Fe(N3)2(4,4′-bpy)] (I) contains end-on (EO) bridging azido ligands. It crystallizes in the orthorhombic crystal system, space group Cmmm (No. 65): a = 11.444(2) Å, b = 15.181(3) Å, c = 3.458(1) Å, V = 600.8(2) Å3, and Z = 2. The compound 3D-[Fe(N3)2(4,4′-bpy)] (II) contains end-to-end (EE) azido bridges. It belongs to the tetragonal crystal system, space group P41212 (No. 92): a = 8.132(1) Å, b = 8.132(1) Å, c = 16.708(3) Å, V = 1104.9(5) Å3, and Z = 4. Crystals of I and II have been grown by the diffusion method. Phase-pure samples of both compounds have been obtained by means of an optimal solution synthesis. Spontaneous long-range magnetic ordering was found in both I and II, with I being a metamagnet, and II being a ferromagnet. For I, in the low-field region, multiple transitions at TN1 = 20 K and TN2 = 5 K were observed, and these indicated the existence of Fe moment reorientation. Heat capacity measurements on II confirmed ferromagnetic transition at TC = 20 K.
| Original language | English |
|---|---|
| Pages (from-to) | 2239-2247 |
| Number of pages | 9 |
| Journal | Chemistry - A European Journal |
| Volume | 8 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - May 17 2002 |
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Keywords
- Controlled synthesis
- Iron
- Magnetic properties
- Polymers
ASJC Scopus subject areas
- Chemistry(all)
Cite this
Controlled synthesis and magnetic properties of 2D and 3D iron azide networks ∞ 2[Fe(N3)2(4,4′-bpy)] and ∞ 3[Fe(N3)2(4,4′-bpy)]. / Fu, Aihua; Huang, Xiaoying; Li, Jing; Yuen, Tan; Lin, Chyan Long.
In: Chemistry - A European Journal, Vol. 8, No. 10, 17.05.2002, p. 2239-2247.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Controlled synthesis and magnetic properties of 2D and 3D iron azide networks ∞ 2[Fe(N3)2(4,4′-bpy)] and ∞ 3[Fe(N3)2(4,4′-bpy)]
AU - Fu, Aihua
AU - Huang, Xiaoying
AU - Li, Jing
AU - Yuen, Tan
AU - Lin, Chyan Long
PY - 2002/5/17
Y1 - 2002/5/17
N2 - Controlled synthesis of transition metal complexes with mixed ligands has led to two new compounds with the same empirical formula Fe(N3)2(4,4′-bpy)] (4,4′-bpy = 4,4′-bipyridine). The compound 2D-Fe(N3)2(4,4′-bpy)] (I) contains end-on (EO) bridging azido ligands. It crystallizes in the orthorhombic crystal system, space group Cmmm (No. 65): a = 11.444(2) Å, b = 15.181(3) Å, c = 3.458(1) Å, V = 600.8(2) Å3, and Z = 2. The compound 3D-[Fe(N3)2(4,4′-bpy)] (II) contains end-to-end (EE) azido bridges. It belongs to the tetragonal crystal system, space group P41212 (No. 92): a = 8.132(1) Å, b = 8.132(1) Å, c = 16.708(3) Å, V = 1104.9(5) Å3, and Z = 4. Crystals of I and II have been grown by the diffusion method. Phase-pure samples of both compounds have been obtained by means of an optimal solution synthesis. Spontaneous long-range magnetic ordering was found in both I and II, with I being a metamagnet, and II being a ferromagnet. For I, in the low-field region, multiple transitions at TN1 = 20 K and TN2 = 5 K were observed, and these indicated the existence of Fe moment reorientation. Heat capacity measurements on II confirmed ferromagnetic transition at TC = 20 K.
AB - Controlled synthesis of transition metal complexes with mixed ligands has led to two new compounds with the same empirical formula Fe(N3)2(4,4′-bpy)] (4,4′-bpy = 4,4′-bipyridine). The compound 2D-Fe(N3)2(4,4′-bpy)] (I) contains end-on (EO) bridging azido ligands. It crystallizes in the orthorhombic crystal system, space group Cmmm (No. 65): a = 11.444(2) Å, b = 15.181(3) Å, c = 3.458(1) Å, V = 600.8(2) Å3, and Z = 2. The compound 3D-[Fe(N3)2(4,4′-bpy)] (II) contains end-to-end (EE) azido bridges. It belongs to the tetragonal crystal system, space group P41212 (No. 92): a = 8.132(1) Å, b = 8.132(1) Å, c = 16.708(3) Å, V = 1104.9(5) Å3, and Z = 4. Crystals of I and II have been grown by the diffusion method. Phase-pure samples of both compounds have been obtained by means of an optimal solution synthesis. Spontaneous long-range magnetic ordering was found in both I and II, with I being a metamagnet, and II being a ferromagnet. For I, in the low-field region, multiple transitions at TN1 = 20 K and TN2 = 5 K were observed, and these indicated the existence of Fe moment reorientation. Heat capacity measurements on II confirmed ferromagnetic transition at TC = 20 K.
KW - Controlled synthesis
KW - Iron
KW - Magnetic properties
KW - Polymers
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U2 - 10.1002/1521-3765(20020517)8:10<2239::AID-CHEM2239>3.0.CO;2-7
DO - 10.1002/1521-3765(20020517)8:10<2239::AID-CHEM2239>3.0.CO;2-7
M3 - Article
VL - 8
SP - 2239
EP - 2247
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
IS - 10
ER -