TY - JOUR
T1 - Anisotropic Crystal Growth of Layered Nickel Hydroxide along the Stacking Direction Using Amine Ligands
AU - Muramatsu, Keisuke
AU - Jimba, Mina
AU - Yamada, Yumiko
AU - Wada, Hiroaki
AU - Shimojima, Atsushi
AU - Kuroda, Kazuyuki
N1 - Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/6/6
Y1 - 2022/6/6
N2 - Edge surfaces of two-dimensional crystals play crucial roles in their properties, such as intercalation behavior and catalytic activities; however, reports on the preparation of crystals with a high aspect ratio of thickness to lateral size, typically a prism-like crystal morphology composed of stacked layers, are scarce. We report the anisotropic crystal growth of β-Ni(OH)2along the stacking direction using bidentate amine ligands, which act as both the base and the reservoir of Ni2+through the formation of Ni-diamine complexes. Various characterization results of the crystal structure, composition, and crystal orientation indicate the formation of hexagonal prisms of β-Ni(OH)2with an unusually high aspect ratio of the thickness to the lateral size higher than 1. A systematic investigation focusing on the molar ratio of amine ligands to Ni2+, the concentration of Ni-diamine complexes, and stability constants of the complexes revealed that anisotropic growth was promoted when the supersaturation was relatively high and was maintained constant for a long time. We clarified the role of amine ligands in controlling supersaturation through the controlled release of metal ions from stable complexes. β-Co(OH)2with a hexagonal prism shape was prepared using this protocol. This study provides valuable indications for developing synthetic chemistry for various layered compounds to achieve a controlled aspect ratio.
AB - Edge surfaces of two-dimensional crystals play crucial roles in their properties, such as intercalation behavior and catalytic activities; however, reports on the preparation of crystals with a high aspect ratio of thickness to lateral size, typically a prism-like crystal morphology composed of stacked layers, are scarce. We report the anisotropic crystal growth of β-Ni(OH)2along the stacking direction using bidentate amine ligands, which act as both the base and the reservoir of Ni2+through the formation of Ni-diamine complexes. Various characterization results of the crystal structure, composition, and crystal orientation indicate the formation of hexagonal prisms of β-Ni(OH)2with an unusually high aspect ratio of the thickness to the lateral size higher than 1. A systematic investigation focusing on the molar ratio of amine ligands to Ni2+, the concentration of Ni-diamine complexes, and stability constants of the complexes revealed that anisotropic growth was promoted when the supersaturation was relatively high and was maintained constant for a long time. We clarified the role of amine ligands in controlling supersaturation through the controlled release of metal ions from stable complexes. β-Co(OH)2with a hexagonal prism shape was prepared using this protocol. This study provides valuable indications for developing synthetic chemistry for various layered compounds to achieve a controlled aspect ratio.
UR - http://www.scopus.com/inward/record.url?scp=85131701048&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85131701048&partnerID=8YFLogxK
U2 - 10.1021/acs.inorgchem.2c00421
DO - 10.1021/acs.inorgchem.2c00421
M3 - Article
C2 - 35612816
AN - SCOPUS:85131701048
SN - 0020-1669
VL - 61
SP - 8490
EP - 8497
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 22
ER -