Taking Advantage of the Coordinative Behavior of a Tridentate Schiff Base Ligand towards Pd2+ and Cu2

We have explored the suitability of an O,N,N–donor Schiff base (H2SB) for obtaining dinuclear complexes with heavy metal ions such as Cu2+, Zn2+, Ni2+, and Co2+ (borderline acids) as well as Pd2+ and Cd2+ (soft acids). Spectroscopic studies demonstrated that the complexation of H2SB and Cu2+, Zn2+,...

Full description

Saved in:
Bibliographic Details
Published inCrystals (Basel) Vol. 9; no. 8; p. 407
Main Authors Sanmartín-Matalobos, Jesús, Fondo, Matilde, Zarepour-Jevinani, Morteza, García-Deibe, Ana M.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2019
Subjects
Acids
Cadmium
Cobalt
Coordination compounds
Copper
Crystal structure
Fluorescence
Heavy metals
Imines
Medical research
Metal ions
metallophilic interaction
Nickel
Palladium
Schiff base
Stoichiometry
X-ray
Palo Alto California
United States > US
Online AccessGet full text

Cover

More Information
Summary:We have explored the suitability of an O,N,N–donor Schiff base (H2SB) for obtaining dinuclear complexes with heavy metal ions such as Cu2+, Zn2+, Ni2+, and Co2+ (borderline acids) as well as Pd2+ and Cd2+ (soft acids). Spectroscopic studies demonstrated that the complexation of H2SB and Cu2+, Zn2+, Ni2+, Co2+, Pd2+, and Cd2+ occurred at a 1:1 stoichiometry. We have found two square planar centers with Pd-N-Pd angles of 93.08(11)° and a Pd–Pd distance of 3.0102(4) Å in Pd2(SB)2·Me2CO. This Pd–Pd distance is 30% shorter than the sum of the van der Waals radii, which is in accordance with a strong palladophilic interaction. Fluorescence studies on H2SB-M2+ interaction showed that H2SB can detect Cu2+ ions in a sample matrix containing various metal ions (hard, soft, or borderline acids) without interference. Determination of binding constants showed that H2SB has a greater affinity for borderline acids than for soft acids.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst9080407