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Hydrothermal Synthesis, Structural Characterization, Magnetic and Photoelectric Properties of Two Cobalt(II) Coordination Polymers
Author(s) -
Jin Jing,
Niu Shu Yun,
Yang Guang Di,
Ye Ling
Publication year - 2006
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200600197
Subject(s) - stacking , crystallography , cobalt , molecule , hydrogen bond , magnetic susceptibility , polymer , coordination polymer , spin transition , materials science , hydrothermal synthesis , spin crossover , chemistry , hydrothermal circulation , crystal structure , inorganic chemistry , organic chemistry , seismology , geology
Two cobalt(II) coordination polymers, {[Co(μ‐4,4′‐bipy)(4,4′‐bipy) 2 (H 2 O) 2 ]·(OH) 3 ·(Me 4 N)·4,4′‐bipy·4H 2 O} n ( 1 ) and {[Co(μ‐4,4′‐bipy)(H 2 O) 4 ]·suc·4H 2 O} n ( 2 ) (4,4′‐bipy = 4,4′‐bipyridine, suc = succinate dianions), were hydrothermally synthesized and structurally characterized by X‐ray diffraction analysis, UV‐Vis‐NIR, and ICP. The main structure feature common to the both polymers is presence of the infinite linear chains, [Co(μ‐4,4′‐bipy)(4,4′‐bipy) 2 (H 2 O) 2 ] n ( 1 ) and [Co(μ‐4,4′‐bipy)(H 2 O) 4 ] n ( 2 ), respectively. In 1 , the chains are further linked by the hydrogen‐bond and π‐π stacking interaction, producing extended layer structure. The 4,4′‐bipy molecules in 1 play three different roles. In 2 , the chains are linked into three‐dimensional network structure via complicated hydrogen bonding system. The variable temperature (2.0∼300 K) magnetic susceptibility of 1 indicates a tendency of spin‐transition in the temperature range of 110 K to 22 K, which attributes to the transition of high‐spin to low‐spin from Co 2+ (d 7 ) ion. Also, the result of surface photovoltage spectroscopy (SPS) reveals that the polymer 1 has significant photoelectric conversion property in the region of 300‐800 nm.