title: Syntheses and characterization of new nickel coordination polymers with 4,4'-dipyridylsulfide. Dynamic rearrangements of one-dimensional chains responding to external stimuli: temperature variation and guest releases/re-inclusions.
abstract: Crystal structures and dynamic rearrangements of one-dimensional coordination polymers with 4,4'-dipyridylsulfide (dps) have been studied. Reaction of Ni(NO(3))(2)·6H(2)O with dps in EtOH yielded [Ni(dps)(2)(NO(3))(2)] ·EtOH (1), which had channels filled with guest EtOH molecules among the four Ni(dps)(2) chains. This coordination polymer reversibly transformed the channel structure responding to temperature variations. Immersion of 1 in m-xylene released guest EtOH molecules to yield a guest-free coordination polymer [Ni(dps)(2)(NO(3))(2)] (2a), which was also obtained by treatment of Ni(NO(3))(2)·6H(2)O with dps in MeOH. On the other hand, removal of the guest molecules from 1 upon heating at 130 °C under reduced pressure produced a guest-free coordination polymer [Ni(dps)(2)(NO(3))(2)] (2b). Although the 2a and 2b guest-free coordination polymers have the same formula, they showed differences in the assembled structures of the one-dimensional chains. Exposure of 2b to EtOH vapor reproduced 1, while 2a did not convert to 1 in a similar reaction. Reaction of Ni(NO(3))(2)·6H(2)O with dps in acetone provided [Ni(dps)(NO(3))(2)(H(2)O)] ·Me(2)CO (4) with no channel structure. When MeOH or acetone was used as a reaction solvent, the [Ni(dps)(2)(NO(3))(2)] · (guest molecule) type coordination polymer, which was observed in 1, was not formed. Nevertheless, the reaction of Ni(NO(3))(2)·6H(2)O with dps in MeOH/acetone mixed solution produced [Ni(dps)(2)(NO(3))(2)]·0.5(MeOH·acetone) (5), which has an isostructural Ni-dps framework to 1.
authors.affiliation: Center for Instrumental Analysis, Shizuoka University, 836 Ohya, Suruga-kul, Shizuoka 422-8529, Japan.
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Kondo
authors.forename: Hideaki
authors.initials: H
authors.lastname: Takahashi
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Watanabe
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Shimizu
authors.forename: Katsunori
authors.initials: K
authors.lastname: Yamanishi
authors.forename: Makoto
authors.initials: M
authors.lastname: Miyazawa
authors.forename: Naoko
authors.initials: N
authors.lastname: Nishina
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ishida
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kawaguchi
authors.forename: Fumio
authors.initials: F
authors.lastname: Uchida
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D006358:Hot Temperature; D009532:Nickel / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D011108:Polymers; D011725:Pyridines; D009532:Nickel; C034306:4,4'-bipyridyl