Abstract
New tetradentate Schiff base-oxovanadium(IV) complexes, [VO{3-Xsal-(R,R)-2,4-ptn}] (H2{3-Xsal(R,F)-2,4-ptn}: N,N'-di-3-Xsalicylidene-(R,R)-2,4-pentanediamine; X = EtO (ethoxy), MeO (methoxy), and H) were prepared and characterized. Only an orange polymeric form was obtained for the 3-methoxy and nonsubstituted (X = H) complexes. Both orange polymeric (1) and green monomeric (2) crystals were obtained for the 3-ethoxy substituted complex. X-ray structure analyses of 1 and 2 were carried out. Crystal data: [VO{3-EtOsal-(R,R)-2,4-ptn}]·H2O (1), VO6N2C23H30, orthorhombic, P212121, a = 13.764(4) Å,b = 21.544(4) Å, c = 7.682(5) Å, Z = 4; [VO{3-EtOsal-(R,R)-2,4-ptn}] (2), VO5N2C23H28, orthorhombic, P212121, a = 10.393(2) Å, b = 22.278(2) Å, c = 9.886(2) A, Z = 4. The orange crystals (1) have water of crystallization, and the complexes take a polynuclear linear chain structure (⋯V==O⋯V=O⋯) with a six-membered N-N chelate ring in a chair form. The green crystals (2) have no water of crystallization, and the complexes take a mononuclear square-pyramidal structure with a six-membered N-N chelate ring in a flattened boat form. Upon heating at 170 °C for 10 min, orange 1 turned to green 2, which reverted to orange 1 by suspension in water-acetonitrile. Mechanism of the interconversion between the polymeric and monomeric forms is discussed on the basis of their crystal structures.
| Original language | English |
|---|---|
| Pages (from-to) | 7661-7665 |
| Number of pages | 5 |
| Journal | Inorganic Chemistry |
| Volume | 35 |
| Issue number | 26 |
| Publication status | Published - 1996 |
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Interconversion between Polymeric and Monomeric Forms of Oxovanadium(IV) Complexes with Tetradentate Schiff Base Ligands Derived from (R,R)-2,4-Pentanediamine. / Kasahara, Ryuichi; Tsuchimoto, Masanobu; Ohba, Shigeru; Nakajima, Kiyohiko; Ishida, Hiroyuki; Kojima, Masaaki.
In: Inorganic Chemistry, Vol. 35, No. 26, 1996, p. 7661-7665.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interconversion between Polymeric and Monomeric Forms of Oxovanadium(IV) Complexes with Tetradentate Schiff Base Ligands Derived from (R,R)-2,4-Pentanediamine
AU - Kasahara, Ryuichi
AU - Tsuchimoto, Masanobu
AU - Ohba, Shigeru
AU - Nakajima, Kiyohiko
AU - Ishida, Hiroyuki
AU - Kojima, Masaaki
PY - 1996
Y1 - 1996
N2 - New tetradentate Schiff base-oxovanadium(IV) complexes, [VO{3-Xsal-(R,R)-2,4-ptn}] (H2{3-Xsal(R,F)-2,4-ptn}: N,N'-di-3-Xsalicylidene-(R,R)-2,4-pentanediamine; X = EtO (ethoxy), MeO (methoxy), and H) were prepared and characterized. Only an orange polymeric form was obtained for the 3-methoxy and nonsubstituted (X = H) complexes. Both orange polymeric (1) and green monomeric (2) crystals were obtained for the 3-ethoxy substituted complex. X-ray structure analyses of 1 and 2 were carried out. Crystal data: [VO{3-EtOsal-(R,R)-2,4-ptn}]·H2O (1), VO6N2C23H30, orthorhombic, P212121, a = 13.764(4) Å,b = 21.544(4) Å, c = 7.682(5) Å, Z = 4; [VO{3-EtOsal-(R,R)-2,4-ptn}] (2), VO5N2C23H28, orthorhombic, P212121, a = 10.393(2) Å, b = 22.278(2) Å, c = 9.886(2) A, Z = 4. The orange crystals (1) have water of crystallization, and the complexes take a polynuclear linear chain structure (⋯V==O⋯V=O⋯) with a six-membered N-N chelate ring in a chair form. The green crystals (2) have no water of crystallization, and the complexes take a mononuclear square-pyramidal structure with a six-membered N-N chelate ring in a flattened boat form. Upon heating at 170 °C for 10 min, orange 1 turned to green 2, which reverted to orange 1 by suspension in water-acetonitrile. Mechanism of the interconversion between the polymeric and monomeric forms is discussed on the basis of their crystal structures.
AB - New tetradentate Schiff base-oxovanadium(IV) complexes, [VO{3-Xsal-(R,R)-2,4-ptn}] (H2{3-Xsal(R,F)-2,4-ptn}: N,N'-di-3-Xsalicylidene-(R,R)-2,4-pentanediamine; X = EtO (ethoxy), MeO (methoxy), and H) were prepared and characterized. Only an orange polymeric form was obtained for the 3-methoxy and nonsubstituted (X = H) complexes. Both orange polymeric (1) and green monomeric (2) crystals were obtained for the 3-ethoxy substituted complex. X-ray structure analyses of 1 and 2 were carried out. Crystal data: [VO{3-EtOsal-(R,R)-2,4-ptn}]·H2O (1), VO6N2C23H30, orthorhombic, P212121, a = 13.764(4) Å,b = 21.544(4) Å, c = 7.682(5) Å, Z = 4; [VO{3-EtOsal-(R,R)-2,4-ptn}] (2), VO5N2C23H28, orthorhombic, P212121, a = 10.393(2) Å, b = 22.278(2) Å, c = 9.886(2) A, Z = 4. The orange crystals (1) have water of crystallization, and the complexes take a polynuclear linear chain structure (⋯V==O⋯V=O⋯) with a six-membered N-N chelate ring in a chair form. The green crystals (2) have no water of crystallization, and the complexes take a mononuclear square-pyramidal structure with a six-membered N-N chelate ring in a flattened boat form. Upon heating at 170 °C for 10 min, orange 1 turned to green 2, which reverted to orange 1 by suspension in water-acetonitrile. Mechanism of the interconversion between the polymeric and monomeric forms is discussed on the basis of their crystal structures.
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M3 - Article
VL - 35
SP - 7661
EP - 7665
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 26
ER -