Eight isostructural lanthanide coordination polymers [Ln(bptc)(phen)(H2O)]n (Ln = Dy for , Eu for , Tb for , Gd for , Sm for , Nd for , Yb for , Pr for ) were successfully prepared based on bridging asymmetric polycarboxylate ligand biphenyl-3,2',5'-tricarboxylic acid (H3bptc) and chelating 1,10-phenanthroline (phen) coligand. Single crystal X-ray analysis reveals that complexes have a (3,6)-connected CdI2-type coordination network consisting of paddle-wheel dimers [Ln2(CO2)4]. The magnetic and fluorescent properties of have been investigated. Significantly, the Dy(iii) complex behaves with slow relaxation of the magnetization, where the frequency-dependent out-of-phase signals are noticed.

Here we report boron (B) mass fractions and δ 11 B values of a set of geological reference materials including ultramafic rocks, basalts, andesites, felsic rocks and sedimentary materials. Boron was purified using a single column loaded with AGMP-1 resin. The δ 11 B data were determined by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) using the sample-standard bracketing method, and the NIST SRM 951 reference solution was selected as the calibrator. Boron mass fractions were measured by ICP-MS. Based on analyses of the NIST SRM 951 reference solution over a period of 1 year, the intermediate measurement precision for B isotope determinations was better than 0.5‰ (2s). The robustness of the overall B isotope analytical procedure was evaluated by carrying out replicate analyses of five reference materials (i.e., B5, JB-2, JB-3, B6 and JR-2). The eighteen geological reference materials have δ 11 B values ranging from -28.85 to +10.47‰ and B mass fractions ranging from 2.37 to 158 μg g -1 . The comprehensive data set presented here serves as a reference for quality assurance and comparison of B isotope and B mass fraction data among different laboratories.

A simple method has been developed to purify lithium (Li) from matrix elements in geological reference materials, using a single-column packed with AGMP-50 cation exchange resin, followed by high-precision Li isotope measurements by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). A series of tests, such as different types of resin, loading amount of Li, loading volumes, and various eluents, were conducted to ascertain the optimal conditions for Li purification and the effects of intensity, acidity, and presence of potential matrix elements on Li isotope measurements were also evaluated. In our experiment, Al and high-field-strength elements (HFSEs), such as Ti, Zr, and Hf, were eluted by 0.2 M HCl + 0.3 M HF, and 0.73 M HCl was used to separate Li from other matrix elements, such as Na. This method is suitable for processing large amount of Li (60–270 ng) and enabling a Li recovery of close to 100%, with effective removal of matrix elements such as Na and Ca. Besides, our method achieves low matrix interferences (e.g., Na/Li << 1 and Ca/Li << 1 for rock and seawater via a single-column procedure; Ca/Li < 2 for carbonate via a two-column procedure) and also uses small volume of eluents and is rapid (~5 h), enabling a total separation to be completed in ~0.5 d. Using this method, we report Li isotopic compositions of various geological reference materials, including igneous rocks, seawater, and carbonate. The Li isotopic compositions are consistent with the data published previously for the analyzed reference materials. As such, the reported method is ideally suited for Li separation from multiple types of geological samples prior to isotopic analysis.

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A simple method was developed for achieving Fe separation and involved the use of a single column packed with AGMP-50 cation-exchange resin.

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