Azido-palladacycles containing C,N-donor and N-heterocyclic carbene ligands, [(C,N-L)Pd(N 3 )(NHC)] [NHC = IPr; 1,3bis(2,6-diisopropylphenyl)imidazol-2-ylidene], were prepared from (i) IPr and dinuclear Pd II azides, [Pd(μ-N 3 )(C,N-L n )] 2 [C,N-L 1 H = N,NЈ-dimethylbenzylamine; C,N-L 2 H = 2-(2Ј-thienyl)pyridine; C,N-L 3 H = azobenzene; C,N-L 4 H = 2-(ptolyl)pyridine], or from (ii) NaN 3 and mononuclear Pd II chloride, [Pd(Cl)(IPr)(C,N-L n )], in aqueous solution. The structures [a]
Three new 4d−4f metal−organic coordination polymers were prepared by using 4f-block metal complexes as secondary building units. Discrete 4f complexes, [Ln 2 L 6 (H 2 O) 4 ]•{[Ln 2 L 4 (H 2 O) 8 ](NO 3 ) 2 } {Ln = Eu (1), Tb (2), Nd (3)}, were prepared by microwave-heating a mixture of Ln(NO 3 ) 3 •nH 2 O, 3-pyridinepropionic acid (HL), and NaOH in water for 1 min. Compounds 1−3 were subsequently treated with AgNO 3 to form three-dimensional Ag−Ln coordination polymers, [AgLnL 2 (H 2 O) 3 ](NO 3 ) 2 (H 2 O) 4 {Ln = Eu (4), Tb ( 5), Nd (6)}. Compounds 1−3 are isostructural and consist of two dimers: a neural dimer and an ionic dimer. In these compounds, the pyridyl N atoms of ligands do not coordinate to the Ln 3+ ions. In isostructural coordination polymers 4−6, the pyridyl N atoms are bonded to soft Ag + ions, and carboxylate oxygen atoms are bonded to hard Ln 3+ ions. Compounds 1 and 4 exhibit practically the same red luminescence in the solid state, and compounds 2 and 5 exhibit the green luminescence, but compounds 3 and 6 do not exhibit photoluminescence in the visible region.
Three isostructural lanthanide coordination polymers, [Ln(L) (3); L = trans-3-(3-pyridyl)acrylate, (3-py)-CH=CH-COO}, were prepared from HL, lanthanide nitrate, and NaOH in H 2 O by microwave heating. In all coordination polymers, the metal is bonded to eight oxygen atoms, and all pyridyl nitrogen atoms do not coordinate to the metals. All polymers have a 1-D loop-connected chain structure. The hydrogen atoms in the aqua ligands and lattice water molecules all participate in the hydrogen bonds of the O-H···O or O-H···N type. The hydrogen bonds connect the 1-D chains to create a 2-D network. Polymer 1 exhibited red luminescence in the solid state at room temperature.
Große Einkristalle des chiralen Ferrimagneten [{Cr(CN)6}{Mn(S)‐pnH(H2O)}](H2O) entstehen bei der Reaktion von K3[Cr(CN)6], Mn(ClO4)2 und (S)‐1,2‐Diaminopropan‐Dihydrochlorid (siehe Bild; (S)‐pn=(S)‐1,2‐Diaminopropan). Die MnII‐ und CrIII‐Zentren der Verbindung wechselwirken ferrimagnetisch; die Übergangstemperatur beträgt 38 K.
Two lanthanide complexes, [Ln(NO 3 ) 2 (H 2 O) 3 (L) 2 ](NO 3 )(H 2 O) {Ln = Eu (1), Tb (2); L = 2-(4-pyridylium)-ethanesulfonate, (4-pyH) + -CH 2 CH 2 -SO 3 -)}, were prepared from lanthanide nitrate and 4-pyridineethanesulfonic acid in H 2 O under microwave-heating conditions. Complexes 1 and 2 are isostructural, and the lanthanide metal in both complexes is coordinated to nine oxygen atoms. The pyridyl nitrogen in the ligand is protonated to give a zwitter ion that possesses an NH + (pyridyl) positive end and an SO 3 -negative end. All O−H and N−H hydrogen atoms participate in hydrogen bonds to generate a two-dimensional (complex 1) or a threedimensional network (complex 2). Complex 1 exhibits an intense red emission, whereas complex 2 exhibits an intense green emission in the solid state at room temperature.
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