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Structure and third‐order nonlinear optical properties of the two‐dimensional Co II coordination polymer [Co(1,2‐BIB)(PA)] n {1,2‐BIB is 1,2‐bis[(1 H ‐imidazol‐1‐yl)methyl]benzene and H 2 PA is phthalic acid}
Author(s) -
Liu Ping,
Liu Qiuxia,
Zhao Ning,
An Caixia,
Lian Zhaoxun
Publication year - 2016
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229616015928
Subject(s) - benzene , polymer , crystallography , delocalized electron , hydrothermal circulation , nonlinear optical , order (exchange) , ion , absorption (acoustics) , materials science , phthalocyanine , hydrothermal synthesis , chemistry , nanotechnology , nonlinear system , physics , organic chemistry , chemical engineering , finance , quantum mechanics , engineering , economics , composite material
The design of nonlinear optical (NLO) materials with large NLO responses has been a challenge for materials scientists and chemists. Recently, organic polymers have received attention regarding their NLO properties and fast nonlinear response, and clusters involving delocalized d π– p π systems and conjugated d π– p π systems are expected to be a new class of NLO materials. Metal–organic coordination polymers combine the advantages of the organic and inorganic species. Thus far, tuning the third‐order NLO properties of these materials has been a significant challenge. A two‐dimensional coordination polymer, namely poly[(μ‐benzene‐1,2‐dicarboxylato‐κ 3 O 1 , O 1′ : O 3 ){μ‐1,2‐bis[(1 H ‐imidazol‐1‐yl)methyl]benzene‐κ 2 N 3 : N 3′ }cobalt(II)], [Co(C 8 H 4 O 4 )(C 14 H 14 N 4 )] n , was synthesized by hydrothermal methods. In the structure, the Co II ion is pentacoordinated by two N atoms from two different 1,2‐bis[(1 H ‐imidazol‐1‐yl)methyl]benzene (1,2‐BIB) ligands and three O atoms from two symmetry‐related benzene‐1,2‐dicarboxylate (isophthalate, PA) anions. The pentacoordinated Co II ions are linked by PA ligands to form a chain structure parallel to the c axis. Adjacent chains are further connected by 1,2‐BIB ligands to produce a two‐dimensional layered structure. The compound exhibits strong third‐order nonlinear absorption and nonlinear refraction effects as a thin film. The third‐order susceptibility χ (3) is calculated to be 1.07 × 10 −8 esu, which is much larger than the values found for pure inorganic semiconductors and some polymers.