Synthesis, structure, terahertz spectroscopy and luminescent properties of copper (I) complexes with bis(diphenylphosphino)methane and N-donor ligands

• Five complexes were characterized by elemental analysis, X-ray diffraction, photophysics, 1H, 31P NMR spectroscopy.
• Compound 2 can be simplified as three-dimensional topology.
• Complex 5 is of infinite chain structure linked by 4,4-bipy.
• The complexes 1–5 exhibit interesting fluorescence in the solid state at room temperature.
• The terahertz spectroscopy of complexes 1–5 have been characterized.

The reactions of copper(I) salts CuX [X = Cl, OTf (OTf = CF3SO3) and ClO4] and bis(diphenylphosphino)methane (dppm) with 4,4-bipyridine (4,4-bipy), 2,2-bipyridine (2,2-bipy), isoquinoline (i-C9H7N) and 1,10-phenanthroline (phen) lead to five new copper(I) complexes: [CuCl(dppm)(i-C9H7N)]2 (1), {[CuCl(dppm)(phen)]2
• 5H2O}n (2), [Cu2Cl2(dppm)2(4,4-bipy)]
• 4CH3CN (3), [Cu(dppm)(2,2-bipy)]2(OTf)2 (4), {[Cu2Cl(dppm)2(4,4-bipy)](ClO4)}n (5). Complexes 1, 3 and 4 are of dinuclear structure with eight-membered Cu2P4C2 rings. The structure of compound 2 can be simplified as three-dimensional topology. Complex 5 is of infinite chain structure linked by 4,4-bipy. All these complexes are characterized by IR, elemental analyses, single-crystal X-ray diffraction analysis, luminescence, NMR and terahertz time-domain spectroscopy.

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