Using a temperature-dependent synthetic approach, four distinct new silver(I) coordination polymers resulting from the different conformations adopted by the flexible ligand at different temperatures were obtained.

Owing to their potential as high-performing photochemical and photophysical materials, numerous studies of metalorganic frameworks (MOFs) have been reported.[1] For accessing to the dual (for example green and red emissions) and bimodal emission (UV/Vis and NIR emissions), significant effort has been afforded in design and synthesis of the heterometallic complexes, especially heterolanthanide-based complexes.[2] However, the preparation of f-f and f-d hybrids are very hard due to the inherent difficulty in synthesis of the organic ligands with specific recognizing sites required by the different metal ions. [3] Motivated by our interest in tunable luminescent hostguest complexes, [4] we have initiated a synthetic program for preparation of the open heteroatom-rich MOFs, in which the flexible open-chain polyether-bridged organic spacers are chosen as the building blocks.[5] The porous metal-organic frameworks containing heteroatom-rich rungs would incorporate electrophilic species into a host-guest system in a crown ether manner. The synthesis of hollow MOFs based on long, flexible, open-chain polyether-bridged ligands, however, is extremely challenging, owing to an unavoidably large amount of framework interpenetration. Herein, we present a new leaching approach to prepare the hollow oxygen-rich frameworks. Our strategy for the construction of hollow oxygen-rich MOFs, lies with the recognition that the MOFs are designed to possess at least two different types of ligands with different coordinating functional groups (for example, with neutral and charged coordination donors) can be used to synthesize mixed-ligand coordination networks. In such a mixed-ligand framework, the weakly coordinating ligands might be selectively leached by solvent; meanwhile the robust joints consisting of stronger coordinating ligands and metal cations are intact. In this paper, we present the first example of such a mixed-ligand (BIPY: 4,4'-bipyridine and L:1,5-bis(m-carboxyphenoxy)-3-oxapentane) Pb II -framework, furthermore, the hollow oxygen-rich framework Pb 2 L 2 by leaching of the coligand of BIPY under reflux in CDCl 3 . Consequently, the [LnA [5] The three bridging oxygen atoms and the two terminal carboxylate groups on L would result in the target oxygen-rich framework (Supporting Information). The complex [Pb 2 L 2 A C H T U N G T R E N N U N G (bipy)] (1) was obtained as colorless crystals by treatment of PbA C H T U N G T R E N N U N G (OAc) 2 with L/BIPY under hydrothermal conditions (180 8C for 70 h) in high yield (93 %). The single-crystal analysis revealed that 1 crystallizes in the monoclinic space group P2 1 /c. The Pb II center lies in the four-coordinated {PbO 4 } coordination sphere consisting of four carboxylate O-donors. In addition, the Pb II center still weakly coordinates to the N bipy -donor with a long Pb À N distance of 2.629(7) (Scheme 2). As shown in Figure 1, the Pb II centers extend along the crystallographic b axis through L to form a single-stranded helix with a period of separation of % 24 . All th...

A new type of antimony mercapfide heat stabilizer--antimony mono(isooctyl thioglycolate) di(n-dodecanethiol) was prepared, and its apphcafion in polyvinyl chloride (PVC) plastics is discussed. The stabilizing effect of this product is better than the complex-stabilizer of Ca/Zn when it is used in soft PVC and than the complex-stabilizer of lead and dilauratetin dibutyl when it is used in hard PVC. Key words heat stabilizer; antimony mercaptide; antimony mono(isooctyl thioglycolate) eli(n-dodeeanethiol) ; polyvinyl chloride Antimony mercaptide is a new type of heat stabilizer for PVC, which has the following characteristics: high efficiency, nontoxic or harmfulless, low consumption and good attribute for processing, it can replace or partially replace the heat stabilizer of expensive org'anotin and has wide application I~-41 . We have got good results in researching into some antimony mercaptide salt, antimony mercaptan carboxylic ester and antimony dialkyl dithiocarbamate as heat stabihzer of macromolecular materials and extreme-pressure antiwear additive of lube I5-83 . This paper reports preparation of a new type of antimony mercaptide compound--antimony mono(isooctyl thioglycolate) di (n-dodecanethiol) and its application in PVC.