Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Chloro(1,5-cyclooctadiene)copper(I) dimer, is researched, Molecular C16H16Cl2Cu2, CAS is 32717-95-6, about Rare, Hexatomic, Boat-Shaped, Cross-Linked Bis(iminodiphenylphosphorano)methanediide Pincer Carbon Bridged Photoluminescent Copper Clusters Capped with Methyl or Halide Bridges.SDS of cas: 32717-95-6.
The dimeric dilithium methanediide salt [Li2C(Ph2P:NSiMe3)2]2 ([Li2L]2, L = [C(Ph2P:NSiMe3)2]2-) reacted with 6 equiv of [NEt4CuCl2] and 2 equiv of LiMe in THF or ether to give exclusively the six-Cu cluster complex [Cu6L2Me2] (1). Similarly, [Li2L]2 reacted with 3 equiv of the bimetallic Cu halide complexes [(cod)2Cu2X2] (X = Cl, Br, I) in the same solvent to give good yields of three halide-capped six-Cu clusters [Cu6L2(X)2] [X = Cl (2), Br (3), I (4)] with structures very similar to that of 1. These four hexacopper clusters (1-4) as a family show similar 31P NMR spectra with an AB pattern with slightly different chem. shifts but identical coupling constants in solution The reactivity of 2 was explored, and 1 can be quant. generated by addition of 2 equiv of LiMe to 2. Also, the cluster [Cu6L2(OtBu)2] (5) with a similar cage structure is quant. generated by reaction of 2 with 2 equiv of NaOtBu in solution according to 31P NMR spectroscopy. An addnl. Cu complex with a bicopper formulation, [Cu2L(PPh3)2] (6), was synthesized by reaction of [Li2L]2 with 2 equiv of [(NEt4)Cu(PPh3)Cl2]. The authors also observed a monocopper iodide complex with the doubly protonated parent methylene bridged ligand H2L, [CuI(H2L)] (7), as a minor component (∼10%) during the preparation of complex 4. Complexes 1-4, 6, and 7 were characterized by x-ray crystal diffraction. All four clusters (1-4) show a rare boat-shaped conformation of hexacopper clusters assembled by crosslinking of two Cu atoms via geminal substitution on one bis(iminophosphorano)methanediide ligand. Two of these units combine along with two addnl. Cu atoms to form the boat cluster. There is extensive direct Cu-Cu bonding. The cluster is doubly capped, top and bottom, by Me groups (1) or halides (2-4, X = Cl, Br, I). All of these six-Cu clusters absorb and emit in the UV-visible region. The absorption bands and photoluminescent wavelengths are substituent dependent; thus, optical properties of the complex are tunable by substitution of the capping ligands. The spectral and bonding characteristics were explored by Gaussian DFT calculations and NBO anal.
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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider