Synthesis, Structures, and Thermal and Magnetic Properties of New Coordination Polymers Based on Mn(II) and Ni(II) Thiocyanato Complexes with trans-1,2-Bis(4-pyridyl)ethylene as Ligand
نویسندگان
چکیده
Hydrothermal reaction of manganese(II) thiocyanate with trans-1,2-bis(4-pyridyl)ethylene (bpe) in water leads to the formation of the new ligand-rich 1 : 3 (ratio metal/ligand) compound [Mn(NCS)2(bpe)2·(bpe)] (1-Mn). In the crystal structure the manganese cations are octahedrally coordinated by two thiocyanato anions and four bpe ligands and are linked into layers by the bpe ligands. Reaction of manganese(II) thiocyanate with bpe in water leads to the known 1 : 2 compound Mn(NCS)2(bpe)2(H2O)2 (2-Mn). On heating compound 1-Mn is transformed directly into a ligand-deficient 1 : 1 compound of composition [Mn(NCS)2(bpe)]n (4-Mn), whereas on thermal decomposition of 2-Mn a new 1 : 2 anhydrate of composition [Mn(NCS)2(bpe)2]n (3-Mn) can be isolated in the first step, which is transformed into 4-Mn on further heating. In further experiments single crystals of the ligand-deficient compound 4-Mn were also obtained. In its crystal structure the manganese cations are connected by the thiocyanato anions into Mn-(NCS)2-Mn double chains, which are further connected by bpe ligands into layers. In contrast, reaction of nickel(II) thiocyanate with bpe leads always to the formation of only one crystalline phase (1-Ni) that is isotypic to 4-Mn. Magnetic measurements have revealed that all compounds show Curie or Curie-Weiss paramagnetism.
منابع مشابه
Structures and physical properties of oligomeric and polymeric metal complexes based on bis(pyridyl)-substituted TTF ligands and an inorganic analogue.
The bis(pyridyl)-substituted TTF derivative, 2,6(7)-bis(4-pyridyl)-1,4,5,8-tetrathiafulvalene (TTF(py)(2)), and an inorganic analogue, [Ni(4-pedt)(2)] (4-pedt = 1-(pyridin-4-yl)ethylene-1,2-dithiolate), were used as bridging ligands to construct two multinuclear complexes {Co(II)(2)(Tp(Ph2))(2)(OAc)(2)[TTF(py)(2)]} (1, Tp(Ph2) = hydridotri(3,5-diphenylpyrazol-1-yl)borate) and {Co(II)(2)(Tp(Ph2)...
متن کاملSynthesis and characterization of mono- and heterodinuclear complexes of dinucleating macrocyclic ligand bearing hexa- and pentadentate coordination sites
Macrocyclic heterobinuclear Zn(II)–Cu(II) complexes with phenol based dicompartmental ligands possessing contiguous hexa- and penta-coordination sites were prepared by a stepwise procedure. The ligands include similar N4O2 and dissimilar N(imine)3O2 and N(amine)3O2 coordination sites sharing two phenolic oxygen atoms. The six-coordination site comprises two pyridyl pendant arms on the amine nit...
متن کاملSynthesis, Characterization and Theoretical Studies of a New Macroacyclic Schiff-Base Ligand Containing Piperazine Moiety and Related Mn(II), Cu(II), Ni(II) and Cd(II) Complexes
Four new [NiH2L](ClO4)2 (1), [CuH2L](ClO4)2 (2), [MnH2L](ClO4)2 (3) and [CdH2L](ClO4)2 (4), complexes were prepared by the reaction of a new Schiff base ligand and Cu(II), Ni(II), Mn (II) and Zn (II) metal ions in equemolar ratios. The ligand, H2L was synthesized by reaction of 1, 4- bis (2- formylphenyl) piperazine and ethanol amine and characterized with IR and 1H,13C NMR spectroscopy. All co...
متن کاملSonochemical Synthesis of two New Nano-structured Lead(II) and Mercury(II) Coordination Polymers
Two new nano-sized lead(II) and mercury(II) coordination polymers, [Pb(2-bpdh)(NO3)2(H2O)]n(1); (2-bpdh = 2,5-bis(2-pyridyl)-3,4-diaza- 2,4-hexadiene)} and [Hg(4-bpdb)(SCN)2]n (2); (4-bpdb= 1,4-bis(4- pyridyl)-3,4-diaza-1,3-butadiene) were synthesized by a sonochemical method. The structure of 1 may be considered coordination polymer of lead(II) and Single crystal X–ray analysis of compound ...
متن کاملSonochemical Synthesis of a New Nano Lead(II) Coordination Polymer with 2,5-bis(2-pyridyl)-3,4-diaza-2,4- hexadiene ligand: A Precursor to Produce Pure Phase Nano- sized Lead(II) Oxide
A new nano-sized lead(II) coordination polymer, [Pb(2-bpdh)(NO3)2]n (1); (2-bpdh = 2,5-bis(2-pyridyl)-3,4-diaza-2,4-hexadiene)}, was synthesized by a sonochemical method. The structure of 1 may be considered coordination polymer of lead(II) consist of metallocyclicchains formed by bridging NO3- and 2-bpdh l...
متن کامل