Around 10% of the worldwide annual production of gold is used for manufacturing of electronic devices. According to the European Commission, waste electric and electronic equipment is the fastest growing waste stream in the European Union. This has generated the need for an effective method to recover gold from electronic waste. Here, we report a simple, effective, and highly selective nylon-12-based three-dimensional (3D)-printed scavenger objects for gold recovery directly from an aqua regia extract of a printed circuit board waste. Using the easy to handle and reusable 3D-printed meshes or columns, gold can be selectively captured both in a batch and continuous flow processes by dipping the scavenger into the solution or passing the gold-containing solution through the column. The possibility to optimize the shape, size, and flow properties of scavenger objects with 3D printing enables the gold scavengers to match the requirements of any processing plants.

In this paper we introduce a series of stable and thermoreversible metallogels containing terpyridine based ligands with perfluorinated C 8 F 17 tags and M(II) metals.Please check this proof carefully. Our staff will not read it in detail after you have returned it.Translation errors between word-processor files and typesetting systems can occur so the whole proof needs to be read. Please pay particular attention to: tabulated material; equations; numerical data; figures and graphics; and references. If you have not already indicated the corresponding author(s) please mark their name(s) with an asterisk. Please e-mail a list of corrections or the PDF with electronic notes attached -do not change the text within the PDF file or send a revised manuscript. Corrections at this stage should be minor and not involve extensive changes. All corrections must be sent at the same time.Please bear in mind that minor layout improvements, e.g. in line breaking, table widths and graphic placement, are routinely applied to the final version.We will publish articles on the web as soon as possible after receiving your corrections; no late corrections will be made. Please ensure that all queries are answered when returning your proof corrections so that publication of your article is not delayed. Query ReferenceQuery Remarks Q1 For your information: You can cite this article before you receive notification of the page numbers by using the following format: (authors), Dalton Trans., (year), DOI: 10.1039/ c6dt02008a. Q2Please check that the inserted CCDC numbers are correct. Q3Please carefully check the spelling of all author names. This is important for the correct indexing and future citation of your article. No late corrections can be made. Q4Do you wish to add an e-mail address for the corresponding author? If so, please supply the e-mail address. Terpyridine based ligands 1 and 2, decorated with a C 8 F 17 perfluorinated tag, are able to form stable thermoreversible gels in the presence of several d-block metal chloride salts. The gel systems obtained have been characterized by NMR, X-ray diffraction, electron microscopies and T gel experiments in order to gain insights into the observed different behaviour of the two similar ligands, also in terms of the effect of additional common anionic species.

Three new compounds have been synthesized and completely characterized by analytical and spectroscopic techniques. The new bipyridine-perfluorinated ligand L1 and the new organometallic complex [Ru(η-MeCp)(PPh)Cl] (Ru1) crystalize in the centrosymmetric triclinic space group P1¯. Analysis of the phenotypic effects induced by both organometallic complexes Ru1 and [Ru(η-MeCp)(PPh)(L1)][CFSO] (Ru2), on human colorectal cancer cells (SW480 and RKO) survival, showed that Ru2 has a potent anti-proliferative activity, 4-6 times higher than cisplatin, and induce apoptosis in these cells. Data obtained in a noncancerous cell line derived from normal colon epithelial cells (NCM460) revealed an intrinsic selectivity of Ru2 for malignant cells at low concentrations, showing the high potential of this compound as a selective anticancer agent.

Metal co-ordination induced supramolecular gelation of low molecular weight organic ligands is a rapidly expanding area of research due to the potential in creating hierarchically self-assembled multi-stimuli responsive materials. In this context, structurally simple O-methylpyridine derivatives of 4,4'-dihydroxy-2,2'-bipyridine ligands are reported. Upon complexation with Ag(i) ions in aqueous dimethyl sulfoxide (DMSO) solutions the ligands spontaneously form metallosupramolecular gels at concentrations as low as 0.6 w/v%. The metal ions induce the self-assembly of three dimensional (3D) fibrillar networks followed by the spontaneous in situ reduction of the Ag-centers to silver nanoparticles (AgNPs) when exposed to daylight. Significant size and morphological differences of the AgNP's was observed between the standard chemical and photochemical reduction of the metallogels. The gelation ability, the nanoparticle formation and rheological properties were found to be depend on the ligand structure, while the strength of the gels is affected by the water content of the gels.

A set of novel polypyridyl Ru(II) complexes 1-7, decorated with one, two or three C 8 F 17 tags have been synthesized and characterized by NMR, UV/Vis spectroscopy and, in the case of series of complexes 1-3, 5 and 7 by X-ray diffraction on single crystals. Solid state structures of 3, 5 and 7 were also subjected to computational DFT study in order to gain insights [a] 4463 into the effect of a different number of perfluorinated tags on their stability in the solid-state. The complexes are stable in solution under strongly oxidative conditions, do keep catalytic activity in their aquo forms (1′-7′) comparing well with parent complex 8′, and their amphiphilic nature could allow for their incorporation in fluorous media and interfaces.by the classic bipy/terpy core but are additionally decorated with one, two or three C 8 F 17 fluorinated pendants. Scheme 1. Molecular formulae of the Ru(II) complexes 1-7 and of the model 8 used as reference.4464 Scheme 2. Synthetic procedure for complexes 1-7 and intermediates 9a-d and 10a-d.

Self-assembly of silver(i) and low molecular weight organic ligands derived from aminopyridine conjugates led to in situ generation of an infinite coordination polymer network and ultra small nanoparticles.

Eight coordination polymers (CPs), {[Ag(L1)]ClO 4 } n (1), {[Ag(L2) 1.5 ]ClO 4 ·C 2 H 3 N} n (2a), {[Ag(L2)]ClO 4 } n (2b), [Zn(L1)Cl 2 ] n (3), {[Zn(L2)Cl 2 ]·CHCl 3 } n (4), {[Cu(L1) 2 Cl]Cl·H 2 O} n (5), [Cu 2 (L2)(µ-Cl) 2 ] n (6) and [Cu 4 (L2)(µ-Cl) 4 ] n (7) were synthesizedvia self-assembly of corresponding metal ions and biimidazole based ditopic ligands, 1,1´bis(pyridin-3-ylmethyl)-2,2´-biimidazole L1 and 1,1´-bis(pyridin-4-ylmethyl)-2,2´-biimidazole L2. These ligands possess conformational flexibility and two pairs of coordination sites: pyridine nitrogen (N Py ) atoms and imidazole nitrogen (N Im ) atoms. Depending on the metal center in CPs, the biimidazole compounds act as tetra -(1, 7), tri-(2a) or bidentate (2a, 2b, 3-6) ligands binding to the metal either via N Py or N Im , or both. All these CPs were structurally fully characterized with single crystal X-ray structure, mass spectrometry, and NMR spectroscopy. The solid state photophysical properties and thermal stabilities of the CPs were also briefly studied in the solid state.

The RuII atoms in the crystal structures of two new potential catalyst precursors, [Ru(Tpy-Cl)(CO)2Cl][Ru(CO)3Cl3] and [Ru(Tpy-Cl)(CO)2Cl2] (Tpy-Cl = 4′-chloro 2,2′:6′,2′′-terpyridine-κ3 N), exhibit distorted octa­hedral coordination spheres.