In the reaction of 1,3-dimethyl-pyrazole-5-carboxylic acid (HL) with
M(OAc)2?4H2O, (M = Cu, Co) two novel complexes have been prepared,
square-planar CuL2(H2O)2 and octahedral CoL2(MeOH)4. The ...crystal
structures have been determined by single-crystal X-ray diffraction. In both
complexes the deprotonated acid displays monodentate coordination to the
metal ions. According to the results of CSD survey this is the first
structural report on the metal complexes with N1-substituted
pyrazole-5-carboxylic ligand.
The work is concerned with the crystal and molecular structures of zinc(II) and mercury(II) complexes with 4-acetyl-3-amino-5-methyl-pyrazole (aamp) of the coordination formulae Zn(NCS)2(aamp)2 and ...(Haamp)2Hg(SCN)4. The zinc(II) complex was obtained by the reaction of a warm methanolic solution of aamp with a mixture of zinc(II) nitrate and ammonium thiocyanate, whereas the mercury(II) complex was prepared by the reaction of a warm ethanolic solution of aamp and a warm, slightly acidified aqueous solution of Hg(SCN)42-. Both complexes have a tetrahedral geometry, which in the case of zinc complex is formed by monodentate coordination of two aamp molecules and two isothiocyanate groups. The Zn(II) and Hg(II) atoms have significantly deformed coordination geometry. In both crystal structures the pyrazole derivative has a planar form, probably stabilized by an intramolecular N-H???O hydrogen bond. Apart from the X-ray structural analysis, the isolated complexes were characterized by elemental analysis, IR spectroscopy, conductometric measurements and thermal analysis.
Odredjene su kristalne i molekulske strukture kompleksa cinka(II) i zive(II) sa 4-acetil-3-amino-5-metilpirazolom (aamp) koordinacionih formula Zn(NCS)2(aamp)2 i (Haamp)2Hg(SCN)2. Kompleks cinka(II) je dobijen reakcijom toplih metanolnih rastvora smese cink(II)-nitrata i amonijum-tiocijanata sa aamp. Kompleks zive(II) nastaje u reakciji toplog etanolnog rastvora aamp i toplog, slabo kiselog vodenog rastvora Hg(SCN)42-. Oba kompleksa imaju tetraedarsku geometriju, koja se u slucaju kompleksa cinka ostvaruje monodentatnom koordinacijom dva molekula aamp i dve izotiocijanatne grupe. Atomi Zn(II) i Hg(II) nalaze se u znatno deformisanom koordinacionom okruzenju. U oba kompleksa derivat pirazola ima planarnu formu koja je verovatno stabilizovana intramolekulskom N-H???O vodonicnom vezom. Dobijena jedinjenja su, osim rendgenskom strukturnom analizom, okarakterisana elementalnom analizom, IR-spektrometrijom, konduktometrijskim merenjima i termickom analizom.
The two title isostructural and isomorphous complexes, M(C6H10N4)2(H2O)21(NO3)2 (M is Co or Ni), contain the transition metal in a distorted octahedral geometry, coordinated by four N atoms of two ...neutral bidentate organic ligands in the equatorial plane and two water 0 atoms molecules in the axial positions. The cation is centrosymmetric, with the transition metal located on an inversion centre. The structures are stabilized by a three-dimensional network of hydrogen bonding.
In the title compound, C
9
H
11
Cl
2
NO
3
, the six-membered ring adopts a screw-chair conformation. In the crystal, two different C—H...O hydrogen bonds involving the same acceptor atom connect the ...molecules into a chain extending along the
c-
axis direction.
Three new binuclear metal complexes:
Cu
2
II
L
2
Cl
4
,
Cu
2
I
L
2
Br
2
and
Co
2
II
L
2
Cl
4
. (L
=
3,5-dimethyl-1-thiocarboxamide pyrazole) have been synthesized and characterized by chemical ...analysis, FT-IR spectroscopy, solution conductivity, solid state magnetic measurements and X-ray single crystal and variable temperature powder diffraction. All crystal structures are stabilized by two-dimensional hydrogen bonding networks between the carboxamide nitrogen donors and the terminal halide acceptors.
Three new binuclear metal complexes of the formulas
Cu
2
II
L
2
Cl
4
(
1
)
,
Cu
2
I
L
2
Br
2
(
2
)
and
Co
2
II
L
2
Cl
4
(
3
)
(L
=
3,5-dimethyl-1-thiocarboxamide pyrazole) have been synthesized and characterized by chemical analysis, FT-IR spectroscopy, solution conductivity, solid state magnetic measurements and X-ray single crystal and variable temperature powder diffraction. Complex
1 forms doubly chloro-bridged dimers, with Cu(II) in distorted trigonal bipyramidal coordination with the apical positions occupied by chlorine atoms. Magnetic measurements indicate an antiferromagnetic interaction between the Cu(II) centres in the dimer, with the singlet–triplet exchange parameter of
J
=
−19.40 cm
−1. Complex
2 forms doubly sulfur-bridged dimers, with Cu(I) in distorted tetrahedral coordination with apical positions occupied by bromine atoms. Complex
3 is a cobalt analogue of
1. It contains dinuclear units formed by five-coordinate high-spin Co(II) in a distorted trigonal bipyramidal environment. The magnetisation of
3 shows no significant departure from Curie–Weiss behaviour between room temperature and 5 K. All crystal structures are stabilized by two-dimensional hydrogen bonding networks between the carboxamide nitrogen donors and the terminal halide acceptors.
The work is concerned with the crystal and molecular structures of zinc(II) and mercury(II) complexes with 4-acetyl-3-amino-5-methyl-pyrazole (aamp) of the coordination formulae Zn(NCS)2(aamp)2 and ...(Haamp)2Hg(SCN)4. The zinc(II) complex was obtained by the reaction of a warm methanolic solution of aamp with a mixture of zinc(II) nitrate and ammonium thiocyanate, whereas the mercury(II) complex was prepared by the reaction of a warm ethanolic solution of aamp and a warm, slightly acidified aqueous solution of Hg(SCN)42-. Both complexes have a tetrahedral geometry, which in the case of zinc complex is formed by monodentate coordination of two aamp molecules and two isothiocyanate groups. The Zn(II) and Hg(II) atoms have significantly deformed coordination geometry. In both crystal structures the pyrazole derivative has a planar form, probably stabilized by an intramolecular N–H···O hydrogen bond. Apart from the X-ray structural analysis, the isolated complexes were characterized by elemental analysis, IR spectroscopy, conductometric measurements and thermal analysis.
4-Di-chloro-methyl-4-methyl-5-(nitro-meth-yl)cyclo-hex-2-enone Novaković, Sladjana B; Rodić, Marko V; Jaćimović, Zeljko K ...
Acta crystallographica. Section E, Structure reports online,
2013-Oct-16, 20131016, Volume:
69, Issue:
Pt 11
Journal Article
Open access
In the title compound, C9H11Cl2NO3, the six-membered ring adopts a screw-chair conformation. In the crystal, two different C-H⋯O hydrogen bonds involving the same acceptor atom connect the mol-ecules ...into a chain extending along the c-axis direction.
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