A Novel Tetranuclear Silver Compound with bis(3,5-dimethylpyrazol-1-yl)acetate: a Simple Synthesis Yielding Complex Crystal Structure.

A novel tetranuclear silver coordination compound with the formula [Ag4(bdmpza)4]×10H2O (bdmpza = bis(3,5-dimethylpyrazol-1-yl)acetate) was synthesized by a reaction between an aqueous solution of silver nitrate and an aqueous solution prepared by bis(3,5-dimethylpyrazol-1-yl)acetic acid and potassium hydroxide (1:1 molar ratio). The obtained compound was characterized by elemental analysis, coupled thermogravimetric-mass spectrometry analysis, vibrational IR spectroscopy, and its crystal structure was determined by single-crystal X-ray diffraction method. Furthermore, the obtained crystal structure was additionally evaluated by Hirshfeld surface analysis.

New Zinc Coordination Compound with Simple Salicylato and Pyridine Ligands: Synthesis, Crystal Structure and Hirshfeld Surface Analysis.

A novel mononuclear zinc coordination compound with formula [Zn(Hsal)2(Py)2] (H2sal = salicylic acid, Py = pyridine) was prepared by mixing aqueous solutions of sodium salicylate and zinc sulfate in 1:1 molar ratio, and to the resulting solution pyridine was added dropwise. The obtained compound was characterized by elemental analysis, IR spectroscopy, and its crystal structure was determined by single-crystal X-ray diffraction method. X-ray structure analysis has shown that the central zinc ion is four-coordinated by two monodentate salicylato ligands and two pyridine molecules, forming a distorted tetrahedron.

[MII(NCS)2(nia)2(OH2)2]: Preparation, Crystal Structure and Thermal Properties (MII = Mn, Fe; nia = nicotinamide).

Two novel isostructural coordination compounds of manganese(II) (1) and iron(II) (2) with common formulae [MII(NCS)2(nia)2(OH2)2] have been prepared from water solution of appropriate metal salt, nicotinamide and KSCN. Their crystal structures were determined by means of X-ray diffraction on single crystals. The mononuclear title compounds crystallize in a triclinic P-1 space group with six monodentate octahedrally arranged ligands around the metal centre.

Stability of the compounds with the octahedral [MII(κ3-L)2] coordination building blocks of late 3d elements via solvate water supramolecular arrangement.

Five new coordination compounds with the common formulae [MII(bdmpza)2]•xH2O (bdmpza = bis(3,5-dimethylpyrazol-1-yl)acetate, C11H15N4COO-; x = 2 for Co (1), Ni (2) and Zn (3), x = 3 for Mn (4) and Fe (5)), were synthesized from the reaction mixtures containing appropriate metal salt, bis(3,5-dimethylpyrazol-1-yl)acetic acid (Hbdmpza), methanol and water. The X-ray single crystal diffraction analysis reveals that all five compounds (1-5) contain mononuclear homoleptic [MII(bdmpza)2] coordination molecules, in which the central metal ions are surrounded with two chelating bdmpza ligands. Each ligand is bound tridentately facially via κ3-N,N,O sites and centrosymmetric coordination chromophore is thus obtained.

Cis-trans isomeric and polymorphic effects on the magnetic properties of water-bridged copper coordination chains.

The synthesis and magnetic characterization of vanillin-based Cu(II) mononuclear complexes of formula [Cu(van)(2)(H(2)O)(2)](H(2)O)(x) (van = vanillinate; x = 0, compound 1; x = 2, compounds 2 and 3) were performed. Despite the presence of very similar [Cu(van)(2)(H(2)O)(2)] moieties, the crystal structures exhibit distinct Cu···Cu contacts and display three different through-H-bond exchange-coupling pathways. As a result of the relative positions of the water molecules, the experimental (MAGSUS) exchange-coupling constants are dissimilar, i.