Zinc 3,5-dimethylpyrazolate complexes: synthesis and structural studies. The crystal and molecular structure of [Zn₂(dmpz)₄(Hdmpz)₂]

Abstract

Can. J . Chem. 68, 1494 (1990).Zinc metal reacts with excess 3,5-dimethylpyrazole (Hdmpz) in the presence of O2 to produce materials of composition Zn ( [Traduit par la revue]

Metal pyrazolate polymers. Part 4. Synthesis, characterization, and magnetic properties of [Co(pz*)2]x complexes (where pz* = pyrazolate, 3-methylpyrazolate, and 4-substituted 3,5-dimethylpyrazolate)

“…Finally, [Zn(4-Hdmpz),], most certainly consists of chains of tetrahedrally coordinated Zn(I1) ions as this ion contains a spherically symmetric, filled, 3d electronic shell and the polymer is derived from the dimeric species in which the Zn(I1) ions are tetrahedrally coordinated (13). The CObalt analogues of these zinc compounds are isomorphous with the latter (14,17) and this lends further credence to the proposed structures for the binary cobalt pyrazolates. Thus, a picture emerges of the general structure of these compounds and it is illustrated in Fig.…”

Synthesis under self-controlled reaction conditions: Reaction of tetraamminezinc(II) chloride with 3,5-dimethyl-1-thiocarboxamide pyrazole

“…Masciocchi [26]. While no basis was introduced into the reaction mixture, the red-ox processes could generate mild basic conditions for a partial deprotonation of Hdmpz.…”

CS2 elimination and C–S bond cleavage in [Zn(dmpzdtc)2] – Leading to formation of a cyclic octanuclear complex [Zn4(μ-dmpz)5(μ-OH)(μ3-S)(py)]2·py(dmpzdtc=3,5-dimethylpyrazole-1-dithiocarboxylate, dmpz=3,5-dimethylpyrazolate)

“…The average Znl 3 -S bond distance (2.295(2) Å ) is slightly shorter than those observed in [Zn 10 S 4 (SEt) 12 (C 5 H 3 (Me) 3 N) 4 ] (2.306(4) Å ) [14] and (Me 4 N) 4 [S 4 Zn 10 (SPh) 16 ] (2.303(3) Å ) [15]. In the six-membered ZnN 2 ZnN 2 ring, the ZnÁ Á ÁZn contacts of 3.562 Å , is significantly longer than ones in the ZnN 2 ZnO and ZnN 2 ZnS rings (3.198-3.234 Å ), but shorter than that found in binuclear complex [{Zn-(Hdmpz)(dmpz)} 2 (l-dmpz) 2 ] (3.747 Å ) [16]. There is no evident interaction between the molecule 2 and the pyridine solvent molecule.…”

“…There is no evident interaction between the molecule 2 and the pyridine solvent molecule. (16); N(1)-Zn(1)-S(1) 119.03 (16); N(5)-Zn(1)-S(1) 104.74 (15); N(6)-Zn(2)-N(8) 112. 6(2); N(6)-Zn(2)-N(7) 110.5 (2); N(8)-Zn(2)-N(7) 108.1 (2); N(6)-Zn(2)-S(1) 106.72 (16); N(8)-Zn(2)-S(1) 108.09 (15); N(7)-Zn (2) The luminescent property of 2 AE py was investigated in solid state at room temperature (Fig.…”