A reversible structural interconversion involving [M(H2pdc)2(H2O)2]·2H 2O (M=Mn, Fe, Co, Ni, Zn, H3pdc=3,5-pyrazoledicarboxylic acid) and the role of a reactive intermediate [Co(H2pdc)2]

Long Pan, Nancy Ching, Xiaoying Huang, Jing Li

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Abstract

A new type of hydrogen bonded networks [M(H2pdc)2(H2O)2]· 2H2O [M=Mn (1), Fe (2), Co (3), Ni (4), Zn (5); H3pdc=3,5-pyrazoledicarboxylic acid] have been synthesized via hydrothermal reactions and their structures have been characterized. Upon a cooling-heating cycle, these compounds undergo a reversible structural interconversion process via hydration-dehydration: [M(H2pdc)2(H2O)2]· 2H2O +4H2O-4H2O [M(H2pdc)2]. The process is associated with distinct color changes. The dehydrated [M(H2pdc)2] (M=Mn, Fe, Co, Ni, and Zn) are amorphous and highly reactive. Further chemical reactions of these reactive intermediates show that they may act as effective precursors towards assembly of new supramolecular compounds that may otherwise be inaccessible by other synthetic routes. An interesting structure containing an "open-box" molecule [Co4(Hpdc)4(py)12]·4 py·2 H2O· 2CH3OH (6) (py=pyridine) has been isolated by using dehydrated [Co(H2pdc)2] as the precursor, and its crystal structure has been analyzed. Crystal data for 1-6: monoclinic, space group P21/c and Z=2 with a= 10.186(2), b=12.473(2), c=6.831(1) Å, β=108.80(3)° (1); a=9.896(2), b= 12.402(2), c=6.810(1) Å, β=108.15(3)° (2); a=9.981(2), b=12.426(2), c= 6.807(1) Å, β=108.23(3)° (3); a= 9.896(2), b=12.402(2), c=6.810(1) Å, β=108.15(3)° (4); a=10.001(2), b= 12.430(2), c=6.834(1) Å, β=108.32(3)° (5); a=9.9617(1), b=18.5080(2), c= 28.4786(3) Å, β=93.076(1)° (6).

Original languageEnglish
Pages (from-to)4431-4437
Number of pages7
JournalChemistry - A European Journal
Volume7
Issue number20
Publication statusPublished - 2001

Fingerprint

Dehydration
Hydration
Pyridine
Chemical reactions
Hydrogen
Crystal structure
Cooling
Color
Heating
Crystals
Molecules
Acids
pyridine
3,5-pyrazoledicarboxylic acid

Keywords

  • Carboxylate ligands
  • Hydrogen bonds
  • Self-assembly
  • Structure elucidation
  • Supramolecular chemistry

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

@article{9910915ff6b3441a8c0aef117324f8e3,
title = "A reversible structural interconversion involving [M(H2pdc)2(H2O)2]·2H 2O (M=Mn, Fe, Co, Ni, Zn, H3pdc=3,5-pyrazoledicarboxylic acid) and the role of a reactive intermediate [Co(H2pdc)2]",
abstract = "A new type of hydrogen bonded networks [M(H2pdc)2(H2O)2]· 2H2O [M=Mn (1), Fe (2), Co (3), Ni (4), Zn (5); H3pdc=3,5-pyrazoledicarboxylic acid] have been synthesized via hydrothermal reactions and their structures have been characterized. Upon a cooling-heating cycle, these compounds undergo a reversible structural interconversion process via hydration-dehydration: [M(H2pdc)2(H2O)2]· 2H2O +4H2O⇌-4H2O [M(H2pdc)2]. The process is associated with distinct color changes. The dehydrated [M(H2pdc)2] (M=Mn, Fe, Co, Ni, and Zn) are amorphous and highly reactive. Further chemical reactions of these reactive intermediates show that they may act as effective precursors towards assembly of new supramolecular compounds that may otherwise be inaccessible by other synthetic routes. An interesting structure containing an {"}open-box{"} molecule [Co4(Hpdc)4(py)12]·4 py·2 H2O· 2CH3OH (6) (py=pyridine) has been isolated by using dehydrated [Co(H2pdc)2] as the precursor, and its crystal structure has been analyzed. Crystal data for 1-6: monoclinic, space group P21/c and Z=2 with a= 10.186(2), b=12.473(2), c=6.831(1) {\AA}, β=108.80(3)° (1); a=9.896(2), b= 12.402(2), c=6.810(1) {\AA}, β=108.15(3)° (2); a=9.981(2), b=12.426(2), c= 6.807(1) {\AA}, β=108.23(3)° (3); a= 9.896(2), b=12.402(2), c=6.810(1) {\AA}, β=108.15(3)° (4); a=10.001(2), b= 12.430(2), c=6.834(1) {\AA}, β=108.32(3)° (5); a=9.9617(1), b=18.5080(2), c= 28.4786(3) {\AA}, β=93.076(1)° (6).",
keywords = "Carboxylate ligands, Hydrogen bonds, Self-assembly, Structure elucidation, Supramolecular chemistry",
author = "Long Pan and Nancy Ching and Xiaoying Huang and Jing Li",
year = "2001",
language = "English",
volume = "7",
pages = "4431--4437",
journal = "Chemistry - A European Journal",
issn = "0947-6539",
publisher = "Wiley-VCH Verlag",
number = "20",

}

TY - JOUR

T1 - A reversible structural interconversion involving [M(H2pdc)2(H2O)2]·2H 2O (M=Mn, Fe, Co, Ni, Zn, H3pdc=3,5-pyrazoledicarboxylic acid) and the role of a reactive intermediate [Co(H2pdc)2]

AU - Pan, Long

AU - Ching, Nancy

AU - Huang, Xiaoying

AU - Li, Jing

PY - 2001

Y1 - 2001

N2 - A new type of hydrogen bonded networks [M(H2pdc)2(H2O)2]· 2H2O [M=Mn (1), Fe (2), Co (3), Ni (4), Zn (5); H3pdc=3,5-pyrazoledicarboxylic acid] have been synthesized via hydrothermal reactions and their structures have been characterized. Upon a cooling-heating cycle, these compounds undergo a reversible structural interconversion process via hydration-dehydration: [M(H2pdc)2(H2O)2]· 2H2O +4H2O⇌-4H2O [M(H2pdc)2]. The process is associated with distinct color changes. The dehydrated [M(H2pdc)2] (M=Mn, Fe, Co, Ni, and Zn) are amorphous and highly reactive. Further chemical reactions of these reactive intermediates show that they may act as effective precursors towards assembly of new supramolecular compounds that may otherwise be inaccessible by other synthetic routes. An interesting structure containing an "open-box" molecule [Co4(Hpdc)4(py)12]·4 py·2 H2O· 2CH3OH (6) (py=pyridine) has been isolated by using dehydrated [Co(H2pdc)2] as the precursor, and its crystal structure has been analyzed. Crystal data for 1-6: monoclinic, space group P21/c and Z=2 with a= 10.186(2), b=12.473(2), c=6.831(1) Å, β=108.80(3)° (1); a=9.896(2), b= 12.402(2), c=6.810(1) Å, β=108.15(3)° (2); a=9.981(2), b=12.426(2), c= 6.807(1) Å, β=108.23(3)° (3); a= 9.896(2), b=12.402(2), c=6.810(1) Å, β=108.15(3)° (4); a=10.001(2), b= 12.430(2), c=6.834(1) Å, β=108.32(3)° (5); a=9.9617(1), b=18.5080(2), c= 28.4786(3) Å, β=93.076(1)° (6).

AB - A new type of hydrogen bonded networks [M(H2pdc)2(H2O)2]· 2H2O [M=Mn (1), Fe (2), Co (3), Ni (4), Zn (5); H3pdc=3,5-pyrazoledicarboxylic acid] have been synthesized via hydrothermal reactions and their structures have been characterized. Upon a cooling-heating cycle, these compounds undergo a reversible structural interconversion process via hydration-dehydration: [M(H2pdc)2(H2O)2]· 2H2O +4H2O⇌-4H2O [M(H2pdc)2]. The process is associated with distinct color changes. The dehydrated [M(H2pdc)2] (M=Mn, Fe, Co, Ni, and Zn) are amorphous and highly reactive. Further chemical reactions of these reactive intermediates show that they may act as effective precursors towards assembly of new supramolecular compounds that may otherwise be inaccessible by other synthetic routes. An interesting structure containing an "open-box" molecule [Co4(Hpdc)4(py)12]·4 py·2 H2O· 2CH3OH (6) (py=pyridine) has been isolated by using dehydrated [Co(H2pdc)2] as the precursor, and its crystal structure has been analyzed. Crystal data for 1-6: monoclinic, space group P21/c and Z=2 with a= 10.186(2), b=12.473(2), c=6.831(1) Å, β=108.80(3)° (1); a=9.896(2), b= 12.402(2), c=6.810(1) Å, β=108.15(3)° (2); a=9.981(2), b=12.426(2), c= 6.807(1) Å, β=108.23(3)° (3); a= 9.896(2), b=12.402(2), c=6.810(1) Å, β=108.15(3)° (4); a=10.001(2), b= 12.430(2), c=6.834(1) Å, β=108.32(3)° (5); a=9.9617(1), b=18.5080(2), c= 28.4786(3) Å, β=93.076(1)° (6).

KW - Carboxylate ligands

KW - Hydrogen bonds

KW - Self-assembly

KW - Structure elucidation

KW - Supramolecular chemistry

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UR - http://www.scopus.com/inward/citedby.url?scp=0035887428&partnerID=8YFLogxK

M3 - Article

C2 - 11695677

AN - SCOPUS:0035887428

VL - 7

SP - 4431

EP - 4437

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

IS - 20

ER -