title: A Polar Titanium-Organic Chain with a Very Large Second-Harmonic-Generation Response.
abstract: A noncentrosymmetric (NCS) titanium-organic compound, [H2N(CH3)2]TiO{[NC5H3(CO2)2][NC5H4(CO2)]} (CAUMOF-18), has been synthesized by a solvothermal reaction. The aligned unidimensional polar chain structure of CAUMOF-18 consisting of corner-shared distorted TiO5N2pentagonal bipyramids is attributed to strong hydrogen-bonding and π-π interactions. CAUMOF-18 reveals a very strong second-harmonic-generation efficiency of 400 times that of α-SiO2and is phase-matchable (type I). Water-molecule-driven reversible centricity conversion and topotactic transformation to TiO2microrods for CAUMOF-18 are also presented.
authors.affiliation: Department of Chemistry, Chung-Ang University , 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
authors.forename: Bongsu
authors.initials: B
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Chung-Ang University , 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
authors.forename: Seung-Jin
authors.initials: SJ
authors.lastname: Oh
authors.affiliation: Department of Chemistry, Chung-Ang University , 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
authors.forename: Hongil
authors.initials: H
authors.lastname: Jo
authors.affiliation: Department of Chemistry, Chung-Ang University , 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
authors.forename: Kang Min
authors.initials: KM
authors.lastname: Ok