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Published on: April 9, 2018
Semiconducting Coordination Polymers Based on the Predesigned Ternary Te-Fe-Cu Carbonyl Cluster and
Minghuey Shieh1, Chia-Chi Yu1, Chia-Yeh Miu1
1Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Ting-Chow Rd., Taipei, 11677, Taiwan, R.O.C.
Abstract:
A series of semiconducting cluster-incorporated Cu-based coordination polymers, namely, 1D zigzag polymers [{TeFe3 (CO)9 Cu2 }(L)]n (L=1,2-bis(4-pyridyl)ethane (bpea), 1; L=1,2-bis(4-pyridyl)ethylene (bpee), 5), 2D honeycomb-like polymers [{TeFe3 (CO)9 Cu}Cu(L)2.5 ]n (L=bpea, 2; L=bpee, 6), and 2D wave-like cation-anion polymer [{Cu2 (L)4 }({TeFe3 (CO)9 Cu}2 (L))]n (L=1,3-bis(4-pyridyl)propane (bpp), 4), as well as the macrocycle [{TeFe3 (CO)9 Cu2 }2 (bpp)2 ] (3) have been quantitatively synthesized via the liquid-assisted grinding from the pre-designed cluster [TeFe3 (CO)9 Cu2 (MeCN)2 ] with conjugated or conjugation-interrupted dipyridyl linkers. Notably, the most conjugation-interrupted bpp-bridged polymer 4 exhibited extraordinary semiconducting characteristics with an ultra-narrow bandgap of 1.43 eV and a DC conductivity of 1.5×10-2 Ω-1 cm-1 , which violates our knowledge, mainly attributed to the through-space electron transport via non-classical C-H⋅⋅⋅O(carbonyl) hydrogen bonds and aromatic C-H⋅⋅⋅π interactions. The incorporated Te-Fe-CO anions can not only provide numerous possibilities for secondary interactions within these Cu-based polymers but also serve as a redox-active coordination ligand to promote their conductivities. The intriguing structure-property relationships were studied by X-ray and DFT analyses and further demonstrated by significant change in the oxidation state of Cu atoms by XPS and Cu K-edge XANES.
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