Theoretical Study and Luminescence Properties of the Cyclic Cu(3)(dppm)(3)OH(2+) Cluster. The First Luminescent Cluster Host at Room Temperature

Self-Assembly of Discrete Metallocycles versus Coordination Polymers Based on Cu(I) and Ag(I) Ions and Flexible Ligands: Structural Diversification and Luminescent Properties

Three new Ag(I) and one Cu(I) coordination compounds with two different positional isomers, propane-1,3-diyl bis(pyridine-4-carboxylate) (L1) and propane-1,3-diyl bis(pyridine-3-carboxylate) (L2), of a bis-(pyridyl-carboxylate) ligand have been synthesized. X-ray diffraction analysis revealed that the self-assembly of L1 with AgCF₃SO₃ and AgClO₄ salts leads to the formation of discrete binuclear metallocycles {Ag(L1)CF₃SO₃}₂ (1) and {Ag(L1)ClO₄}₂ (2), respectively. However, self-assembly of the other ligand, L2, with AgCF₃SO₃ and CuCl salts, results in a 1-D zig-zag chain {Ag(L2)CF₃SO₃}_∞ (3) and a 1-D double-stranded helical chain {Cu₂Cl₂(L2)₂}_∞ (4) coordination polymers, respectively. Solid emission spectra recorded at room temperature show interesting luminescence properties for all four compounds in the range from 438 to 550 nm, especially for compound 4 that was found to change its emission color when the wavelength of the excitation radiation is switched from 332 to 436 nm.

Structural and photophysical study of copper iodide complex with P^N or P^N^P ligand

A series of CuI complexes with P^N or P^N^P ligand showing rich structural and photophysical properties were synthesized and studied.

Unexpected Reactivities of Cu2(diphosphine)2 Complexes in Alcohol: Isolation, X-ray Crystal Structure, and Photoluminescent Properties of a Remarkably Stable [Cu3(diphosphine)3(μ3-H)]2+ Hydride Complex

Treatment of [Cu2(dcpm)2]Y2 (dcpm = bis(dicyclohexylphosphino)methane, Y = ClO4-, BF4-, PF6-, CF3SO3-) with refluxing MeOH in the presence of KOH afforded hydride complexes [Cu3(dcpm)3(mu3-H)]Y2 (1) in about 85% yield. Refluxing [Cu2(dcpm)2](PF6)2 with MeOH in the presence of NH3.H2O and air gave a carboxylate complex [Cu2(dcpm)2(O2CCH2OH)]PF6 (2) in 40% yield. All of the complexes 1 and 2 have been characterized by X-ray crystallography. The Cu3 cores in 1 are almost perfectly shielded by the dcpm ligands. Intense photoluminescence was observed for 1 both in the solid state and in solution.

A trigonal planar mu 3-fluorido coinage metal complex from a dicationic (diphosphinomethane)copper(I) dimer: syntheses, structures, and bonding

The triflate and hexafluorophosphate salts of [Cu2(mu-dtbpm)2]2+ (1(2+)) [dtbpm = bis(di-tert-butylphosphino)methane, tBu2PCH2PtBu2] and of [Cu3(mu 3-F)(mu-dtbpm)3]2+ (2(2+)) were synthesized and characterized. Coordination of solvent or counterions to 1(2+) is observed neither in solution nor in the solid state. The two copper(I) centers in 1(2+) indicate weak d10-d10 closed-shell interactions. 1(2+) reacts slowly with PF6- anions in acetone or KF in CH2Cl2 to yield the mu 3-fluorido complex 2(2+) with idealized D3 symmetry, containing a trigonal planar Cu3F core, as shown by single-crystal X-ray diffraction. Distinct structural differences are observed compared to monocationic bicapped, trinuclear copper(I) dppm halide complexes [dppm = bis(diphenylphosphino)methane, Ph2PCH2PPh2]. The average Cu-Cu, Cu-F, and Cu-P distances and the P-Cu-P' angle in 2(2+) are 3.85, 2.22, and 2.28 A and 144.3 degrees, respectively. The P2Cu units are twisted out of the Cu3F plane by an average angle of 18.4 degrees. DFT calculations (BPW91/LANL2DZ) for the model [Cu3(mu 3-F)(mu-dhpm)3]2+ (dhpm = diphosphinomethane, H2PCH2PH2) are used to explain the formation, structure, and bonding pattern of 2(2+).

Synthesis and Structures of Oxyanion Encapsulated Copper(I)-dppm Complexes (dppm = Bis(diphenylphosphino)methane)

Copper(I)-dppm complexes encapsulating the oxyanions ClO(4)(-), NO(3)(-), CH(3)C(6)H(4)CO(2)(-), SO(4)(2-), and WO(4)(2-) have been synthesized either by reduction of the corresponding Cu(II) salts and treatment with dppm, or by treating the complex [Cu(2)(dppm)(2)(dmcn)(3)](BF(4))(2) (1) (dmcn = dimethyl cyanamide) with the respective anion. The isolated complexes [Cu(2)(dppm)(2)(dmcn)(2)(ClO(4))] (ClO(4)) (2), [Cu(2)(dppm)(2)(dmcn)(2)(NO(3))] (NO(3)) (3), Cu(2)(dppm)(2)(NO(3))(2) (4), [Cu(2)(dppm)(2)(CH(3)C(6)H(4)CO(2))(2)]dmcn.2THF (5), Cu(2)(dppm)(2)(SO(4)) (6), and [Cu(3)(dppm)(3)(Cl)(WO(4))] 0.5H(2)O (7) have been characterized by IR, (1)H and (31)P{(1)H} NMR, UV-vis, and emission spectroscopy. The solid-state molecular structure of complexes 1, 2, 4, and 7 were determined by single-crystal X-ray diffraction. Pertinent crystal data are as follows: for 1, monoclinic P2(1)/c, a = 11.376(10) Å, b = 42.503(7) Å, c = 13.530(6) Å, beta = 108.08(2) degrees, V = 6219(3) Å(3), Z = 4; for 2, monoclinic P2(1)/n, a = 21.600(3) Å, b = 12.968(3) Å, c = 23.050(3) Å, beta = 115.97(2) degrees, V = 5804(17) Å(3), Z = 4; for 4, triclinic P&onemacr;, a = 10.560(4) Å, b = 10.553(3) Å, c = 22.698(3) Å, alpha = 96.08(2) degrees, beta = 96.03(2) degrees, gamma = 108.31(2) degrees, V = 2362(12) Å(3), Z = 2; and for 7, orthorhombic P2(1)2(1)2(1), a = 14.407(4) Å, b = 20.573(7) Å, c = 24.176(6) Å, V = 7166(4) Å(3), Z = 4. Analyses of the crystallographic and spectroscopic data of these complexes reveal the nature of interactions between the Cu(I)-dppm core and oxyanion. The anchoring of the oxyanion to the Cu(n)()(dppm)(n)() unit is primarily through coordination to the metal, but the noncovalent C-H.O interactions between the methylene and phenyl protons of the dppm and oxygen atoms of the oxyanion play a significant role. The solid-state emission spectra for complexes 1-6 are very similar but different from 7. In CDCl(3) solution, addition of ClO(4)(-) or NO(3)(-) (as their tetrabutylammonium salts) to 1 establishes a rapid equilibrium between the anion-complexed and uncomplexed forms. The association constant values for ClO(4)(-) and NO(3)(-) have been estimated from the (31)P{(1)H} NMR spectra.

Photoinduced oxidative degradation of unsaturated M3(dppm)3CO2+ clusters (M = Pd, Pt) by chlorocarbons and chloride ion

Both M3(dppm)3CO2+ clusters (M = Pd, Pt) photoreact with chlorocarbons (Cl—R; R = CCl3, CHCl2, CH2Cl, C6H5, C10H15 (adamantyl)) and chloride ion (slowly) to produce the oxidized mononuclear species M(dppm)Cl2 as a sole isolated M-coordinated inorganic product. Such reactions do not proceed in the dark, except for R = CH2C6H5. Among the organic products, the coupling compound R–R (R = C6H5) is observed along with many phosphine compounds such as P(C6H5)3. In an attempt to elucidate the photoinduced mechanism at the early stage of the phototransformations, the following have been investigated: the ground state binding constants (K11 for M = Pd in methanol), the photochemical quantum yields of cluster disappearance (Φdis for M = Pd) as a function of substrates, substrate concentrations, excitation wavelengths, solvents (ethanol vs toluene), and presence of CO, and the emission lifetimes (τe for M = Pt) at 77 K as a function of substrate concentrations (CH2Cl2 and CHCl3) in ethanol and toluene. Some of the experimental conclusions have also been corroborated theoretically using density functional theory. Geometry optimization calculations have been performed for the model compounds [Formula: see text] Pd3(PH3)62+,[Formula: see text], [Formula: see text] and Pd3(PH3)6CO3+ in their ground states. Key words: atom abstraction, photochemistry, C-Cl bond, clusters, host-guest.