Crystal Structure of N,N,N’,N’-tetra-[(3,5-dimethyl-1-pyrazolyl) methyl]-para-phenylenediamine

Abstract

The title compound, molecular formula C30H40N10, crystallizes and exhibits a cisoidal conformation around a central p-phenylenediamine ring suggesting that this bis-tripodal ligand is highly flexible and could be accommodated by many and original metal coordinations. All four five-membered pyrazole rings are identical. The molecule presents an inversion centre that coincides with the phenyl ring centre: pyrazole rings are two-by-two equivalent. The electrostatic spatial intramolecular repulsion between N4 and N5 is probably responsible for this general arrangement. These data emphasize the basic character of nitrogens N4 and N5.

Synthesis, structure and cytotoxic activity of mixed-valent Cu(I)/Cu(II) salt containing a pyrazolone derivative as ligand

“…They have analgesic, antipyretic, antiinflammatory, antibacterial, antitumor activity [1][2][3][4][5][6][7][8][9]. The chemistry of pyrazolone derivatives has been expanded with the synthesis of their metal complexes, studies intended to explain their biological activity which might be based on their capacity to form complexes with some oligoelements.…”

Dinuclear Cobalt(II) Complex with <i>N</i>,<i>N</i>,<i>N</i>&prime;,<i>N</i>&prime;-Tetrakis(3,5-dimethyl-1-pyrazolyl)methyl-1,4-phenylenediamine Having a Tetrahedral Coordination Geometry

“…The crystal structure of the tpmp ligand, itself, was elucidated by X-ray crystallography. 6 The conformation of tpmp is similar to that of the present cobalt complex, but slightly changed so as to accommodate for the binding of the two cobalt atoms. In the crystal, the dinuclear molecule takes an extended form with a Co(1)·Co(2) distance of 11.522(1)Å (Fig.…”

“…[1][2][3][4][5] Herein, we introduce a multidentate ligand, N,N,N¢,N¢-tetrakis(3,5-dimethyl-1-pyrazolyl)methyl-1,4-phenylenediamine (tpmp), which has a linear backbone of 1,4-phenylenediamine moiety. 6 These kinds of multidentate organic ligands are interesting, because linear backbone may serve as a spacer for an organic linking ligand or a multidentate chelating ligand, like 1,4-benzeneditetrazolate in coordination polymers. 7 In this study, we isolated a new dinuclear cobalt complex from a reaction of cobalt(II) chloride and tpmp, and determined the crystal structure of this compound, which consists of two tetrahedral cobalt(II) atoms with two pyrazolato-nitrogen atoms of tpmp and two chloride atoms, as shown in Fig.…”

Tetranuclear Nickel(II) and Cobalt(II) Complexes with 3,5-Dimethyl-1-pyrazolylmethanolato and Acetato Bridges Having a Cubane Core

“…We can see that all of the bond distances of the cobalt(II) complex are a little longer than the corresponding distances of the nickel(II) complex, reflecting the difference between the high-spin d 7 and d 8 electronic configurations (Table 3). 9 …”

“…[1][2][3][4][5][6][7][8] Recently, we studied metal complexes with a multidentate ligand, N,N,N¢,N¢-tetrakis(3,5-dimethyl-1-pyrazolyl)methyl-1,4-phenylenediamine (tpmp), having the 1,4-phenylenediamine moiety, and isolated a dinuclear cobalt complex from a reaction of cobalt(II) chloride and tpmp consisting of two tetrahedral cobalt(II) atoms with two pyrazolato-nitrogen atoms of tpmp and two chloride atoms. 6 In this study, we tried to extend this work to reactions with other metal salts, such as cobalt(II) acetate and nickel(II) acetate.…”