Copper(I) oligomers and polymers with dicyanobenzene and cyanopyridine ligands

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• 作者：Mark K. Broderick^a ; Congqi Yang^a ; Robert D. Pike^a ; ; Aaron Nicholas^b ; Daniel May^b ; Howard H. Patterson^b
• 关键词：Copper complexes ; Crystal structures ; Dimer ; Metal-organic polymer ; Luminescence
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：16 August 2016
• 年：2016
• 卷：114
• 期：Complete
• 页码：333-343
• 全文大小：2177 K

文摘

The reaction of [Cu(MeCN)₄]BF₄ with o-, m-, or p-dicyanobenzene (DCB) or o-, m-, or p-cyanopyridine (CPy) in the presence of two equivalents of PPh₃ produces DCB- or CPy-bridged copper(I) complexes. Cyclic dimers are formed for the ortho ligands, and zigzag polymers are formed using the para ligands. m-DCB produces a polymer, however m-CPy results in a cyclic trimer. Multiple lattice-bound solvates are formed upon crystallization of the o-DCB dimer from various solvents. A total of 11 X-ray crystal structures are reported for [Cu_n(PPh₃)_2n(bridge)_n](BF₄)_n·(solvent): bridge = o-DCB, n = 2, solvent (per dimer) = none, ½ CH₂Cl₂, CH₂Cl₂, 2 CHCl₃/H₂O, or 2 THF; bridge = m-DCB, n = ∞, solvent = none; bridge = p-DCB, n = ∞, solvent = CH₂Cl₂ (two polymorphs), bridge = o-CPy, n = 2, solvent (per dimer) = 2 toluene; bridge = m-CPy, n = 3, solvent = none; bridge = p-CPy, n = ∞, solvent = ½ acetone. All complexes are photoluminescent with excitation in the range 340–400 nm. The meta complexes emit in the blue region, while the other complexes emit in the green. Dimer complexes of o-DCB exhibit structural flexibility in the central macrocyclic ring. Complexes of m-DCB and p-CPy show orientational disorder in the ligand. Polymeric complexes show helicity. Smaller Stokes shifts are noted for DCB than for CPy complexes, suggesting less excited state distortion for cyanoaromatic ligand complexes of Cu(I).