Hai-Bin Song

Novel lanthanide(III) coordination networks based on 1,2-bis(4-pyridyl)ethane-N, N'-dioxide and trans-1,2-bis(4-pyridyl)ethene-N, N'-dioxide

The new ligand 1,2-bis(4-pyridyl)ethane-N,N′-dioxide (L) was used to generate five lanthanide(III) coordination networks of three structural types: (i) the isomorphous pair {[Ln(L)3]·(ClO4)3·(H2O)}∞ (Ln = Er, 1; Yb, 2) comprises two interpenetrating α-polonium nets in which each lanthanide(III) ion is in a rare homoleptic distorted octahedral coordination environment; (ii) an unprecedented mat-like pattern of three interwoven (6,3) nets is found in isomorphous {[Ln(NO3)3(L)1.5]·H2O}∞ (Ln = Er, 3; Yb, 4); (iii) {[La(NO3)3(L) (CH3OH)]· CH3OH·CH2Cl2}∞, 5, is built of an offset stacking of distorted square grids. The complex [Er(L′)0.5(H2O)3(C2O4)](ClO4)·L′·6H2O·(dioxane)0.5 (L′ = trans-1,2-bis(4-pyridyl)ethene-N,N′-dioxide), 6, is composed of (6,3) nets in which the Er(III) ions are bridged by both L′ ligands and oxalate ions.

Synthesis and structural characterization of hetero-binuclear complexes containing a Fe0→Mn+ bond bridged by a non-rigid P,N-phosphine ligand

A new non-rigid phosphine ligand, N -(diphenylphosphinomethyl)morpholine (L), has been synthesized. Its reaction with K[HFe(CO) 4 ] results in the formation of the organometallic tridentate ligand trans -[Fe(CO) 3 (μ-L) 2 ] which exhibits different coordinate modes in generating hetero-binuclear Fe 0 →M n + complexes (M=Hg(II), Cd(II), Cu(I), Ag(I)). In the copper(I) complex, both tertiary amino groups coordinate to the Cu atom at CuN1=2.059(4) and CuN2=2.055(4) A. In the cadmium(II) complex, one tertiary N atom coordinates to the Cd atom at CdN1=2.481(3) A, but only a weak interaction of 2.730 A exists between the Hg and a N atom in the isomorphous mercury(II) complex.

Coordination networks generated from transition metal chlorides and a flexible double betaine

Abstract The new flexible double betaine 1,4-bis(2-picolyloxyl)benzene-N,N′-diacetate (L) has been synthesized and used to generate five complexes with divalent metal chlorides: [M(H2O)6]Cl2·L·2H2O (M=Mn (1), Co (2)), [Cu(μ-L)Cl2]∞ (3), {[Zn(μ-L)Cl2]·2H2O}∞ (4), and {[Cd2(μ-Cl)2(μ-L)Cl2(H2O)2]·2H2O}∞ (5). Isomorphous compounds 1 and 2 have a hydrogen-bonded three-dimensional network in which adjacent L ligands overlap through π–π stacking of the pyridine and benzene rings. Compounds 3, 4, and 5 display three different types of one-dimensional polymeric structures. Bridged by L acting in the anti mode, compound 3 exhibits an infinite zigzag chain in which consecutive, approximately planar L ligands are arranged in a crossed manner when viewed along the chain direction, the distance between adjacent copper(II) ions being about 13 A. In contrast, compound 4 features a spring-like infinite helical chain with zinc ions lying on the axis and bridged by L acting in the syn fashion, and the Zn(II)⋯Zn(II) separation is approximately 9 A. In compound 5, the building unit is a centrosymmetric Cd2Cl2 moiety, and adjacent dimeric units are linked by the centrosymmetric L ligand acting in the anti mode to give an infinite zigzag chain running along the c axis; such chains are further connected through hydrogen bonds to form a three-dimensional network.

Synthesis and structural characterization of palladium(II) and platinum(II) complexes containing a chiral P,N-donor iminophosphine ligand

A new chiral P,N-donor iminophosphine ligand was used to synthesize a series of palladium(II) and platinum(II) complexes. Single crystal X-ray analysis showed that in all cases the P,N ligand forms a six-membered chelate ring, and the square-planar coordination of the metal atom is completed by two halide ions, two methyl groups, or one methyl group and one halide ion. In the latter instance, the methyl group is cis to the phosphorus atom.

Synthesis and structural study of tri- and dinuclear palladium complexes of 2,6-bis(diphenylphosphino)pyridine

Abstract The bridging ligand 2,6-bis(diphenylphosphino)pyridine, L, was used to synthesize two palladium complexes: Pd3Cl6(μ-L)3 has a C2 axis passing through an 18-membered macrocyclic ring, in which two cis- and one trans-coordinated palladium(II) atoms are alternately bridged by three L ligands; [Pd2(μ-L)2]2+ exhibits a rare coordination mode in which two metal–metal bonded palladium(I) atoms (Pd–Pd = 2.5525(7) A) are each P, N-chelated by one ligand and connected to the bridging phosphorus atom of the other ligand.

Hetero-binuclear complexes containing a Ru0 → Mn+ bond bridged by P,N-phosphine ligands: convenient synthesis of tridentate organometallic trans-Ru(CO)3(L)2 (L = phosphine bearing an N-donor substituent) ligands

A convenient new synthesis of trans-Ru(CO)3(μ-L)2 [L=2-(diphenylphosphino)pyridine, N-(diphenylphosphinomethyl)morpholine)] was developed. The reactions of these two tridentate organometallic ligands with selected group 11 and 12 metal salts resulted in the formation of hetero-binuclear Ru0→Mn+ [M=Ag(I), n=1; Hg(II), Cd(II), n=2] complexes with Ru–Ag=2.7132(7) A, Ru–Hg=2.7075(4) A and Ru–Cd=2.7750(9) A, as determined by X-ray crystallography.

Synthesis and structural study of late transition metal complexes of N-[(diphenylphosphino)methyl]-2-pyridinamine and N-cyclohexyl-N-[(diphenylphosphino)methyl]-2-pyridinamine

The reaction of N-[(diphenylphosphino)methyl]-2-pyridinamine and N-cyclohexyl-N-[(diphenylphosphino)methyl]-2-pyridinamine with palladium(II), copper(I) and silver(I) salts and iron pentacarbonyl in different stoichiometric ratios yielded a series of complexes that display various coordination modes, including a novel P,N(amine),N(pyridyl)-bridging mode in a dinuclear silver complex which is consolidated by the argentophilic interaction.

A novel luminescent copper(I) complex containing an acetylenediide-bridged, butterfly-shaped tetranuclear core

A novel luminescent acetylenediide-bridged tetranuclear copper(I) complex [Cu4(mu-Ph2Ppypz)4(mu 4-eta 1,eta 2-C identical to C)]-(ClO4)2 [Ph2Ppypz = 2-(diphenylphosphino-6-pyrazol-1-yl)pyridine] has been synthesized and structurally characterized by X-ray crystallography.