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Synthesis, Structure and Surface Photovoltage of a Series of Ni II Coordination Polymers

2006; Wiley; Volume: 2006; Issue: 24 Linguagem: Inglês

10.1002/ejic.200600721

1099-0682

Li‐Ping Sun, Shu‐Yun Niu, Jing Jin, Guangdi Yang, Ling Ye,

Magnetism in coordination complexes

Abstract Three novel Ni II coordination polymers [Ni 2 (HCOO) 4 (H 2 O) 4 ] n ( 1 ), [Na 2 Ni(btec)(H 2 O) 8 ] n ( 2 ; H 4 btec = 1,2,4,5‐benzenetetracarboxylic acid) and [{Ni(pdc)(H 2 O) 2 } · H 2 O] n ( 3 ; H 2 pdc = pyridine‐2,5‐dicarboxylic acid) have been hydrothermally synthesized and their structures determined by single‐crystal X‐ray diffraction. The formate groups in complex 1 bridge the Ni II ions to form a infinite 3D structure. Complex 2 also possesses a infinite 3D structure and the coordination environment of the Ni II ion is a perfect octahedron. Complex 3 is a 2D infinite coordination polymer. The surface photovoltage spectra of complexes 1 – 3 indicate that they all show three positive surface photovoltage (SPV) responses in the range of 300–800 nm and all show p‐type semiconductor characteristics. Although the intensities of the SPV responses are obviously different, this can mainly be attributed to the difference of their structures. The field‐induced surface photovoltage spectra (FISPS) of complexes 1 – 3 confirm their p‐type semiconductor characteristics. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)