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

1
Departamento de Química Inorgánica, Facultad de Química, Universidad de Santiago de Compostela, Avda. de las ciencias s/n, 15782 Santiago de Compostela, Spain
2
Department of Chemistry, Sharif University of Technology, Tehran P.O. Box 11155-3516, Iran
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(8), 407; https://doi.org/10.3390/cryst9080407
Received: 23 July 2019 / Revised: 1 August 2019 / Accepted: 3 August 2019 / Published: 5 August 2019
(This article belongs to the Section Crystal Engineering)
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Abstract

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. View Full-Text
Keywords: X-ray; fluorescence; metallophilic interaction; palladium; copper; Schiff base X-ray; fluorescence; metallophilic interaction; palladium; copper; Schiff base
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Sanmartín-Matalobos, J.; Fondo, M.; Zarepour-Jevinani, M.; García-Deibe, A.M. Taking Advantage of the Coordinative Behavior of a Tridentate Schiff Base Ligand towards Pd2+ and Cu2+. Crystals 2019, 9, 407.

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