Rapid and sensitive detection of vanillylmandelic acid based on a luminescent fourteen-metal Tb(III) planar nanocluster.

A 14-metal Tb(III) nanocluster with four CO anions as templates was constructed for the quantitative and qualitative detection of vanillylmandelic acid (VMA) with high sensitivity and selectivity. The luminescence response time to VMA is less than ten seconds, and the limit of detection is as low as 0.32 nM in CHCN.

Rapid and reliable ratiometric fluorescence detection of nitro explosive 2,4,6-trinitrophenol based on a near infrared (NIR) luminescent Zn(II)-Nd(III) nanoring.

Rapid and quantitative detection of 2,4,6-trinitrophenol (TNP) is very crucial for homeland security, military application, and environment protection. Herein, a nine-metal Zn(II)-Nd(III) nanoring 1 with a diameter of 2.3 nm was constructed by the use of a long-chain Schiff base ligand, which shows ratiometric fluorescence response to TNP with high selectivity and sensitivity.

Rapid and reliable ratiometric fluorescence detection of isoquercitrin based on a high-nuclearity Zn(II)-Nd(III) nanomolecular sensor.

Rapid and quantitative detection of isoquercitrin (Isq) has been attracting much attention due to its outstanding pharmacological and physiological activities. Herein, an interesting 48-metal Zn(II)-Nd(III) nanocluster (1, molecular sizes 1.3 × 2.

Laser-imprinting of micro-3D printed protein hydrogels enables real-time independent modification of substrate topography and elastic modulus.

Independent control over the Young's modulus and topography of a hydrogel cell culture substrate is necessary to characterize how attributes of its adherent surface affect cellular responses. Arbitrary, real-time manipulation of these parameters at the micron scale would further provide cellular biologists and bioengineers with the tools to study and control numerous highly dynamic behaviors including cellular adhesion, motility, metastasis, and differentiation. Although physical, chemical, thermal, and light-based strategies have been developed to influence Young's modulus and topography of hydrogel substrates, independent control of these physical attributes has remained elusive, spatial resolution is often limited, and features commonly must be pre-patterned.

Rapid and quantitative detection of the inflammatory marker neopterin based on a visible luminescent Zn(II)-Eu(III) nanocluster.

A high-nuclearity Zn(II)-Eu(III) nanocluster was synthesized for the rapid and quantitative luminescence detection of neopterin as an inflammatory marker.

Construction of a Near-IR-Luminescent Rectangular Yb(III) Complex from a Dodecadentate Schiff Base Ligand for the Excitation-Wavelength-Dependent Detection of Aloe Emodin (a Natural Medicinal Ingredient).

A near-IR-luminescent octanuclear Yb(III) complex was constructed from a new dodecadentate Schiff base ligand, which is used in the rapid and reliable wavelength-dependent detection of aloe emodin (AE) with high sensitivity even in the presence of other interferences.

Rapid and reliable triple-emissive detection of 2,6-dichloro-4-nitroaniline as a pesticide based on a high-nuclear Cd(II)-Sm(III) nanocluster.

A luminescent 56-metal Cd(II)-Sm(III) nanocluster (1, molecular sizes: 4.5 × 2.7 × 2.

Rapid and Reliable Excitation Wavelength-Dependent Detection of 2,6-Dipicolinic Acid Based on a Luminescent Cd(II)-Tb(III) Nanocluster.

A Cd(II)-Tb(III) nanocluster {[CdTbL(OH)(OAc)(HO)][CdTbL(OH)(OAc)(HO)]}·3HO (), which contains two crystallographically independent components, was constructed from a tridentate ligand (HL, 3-ethoxysalicylaldehyde). It exhibits rapid and reliable excitation wavelength-dependent luminescence response to 2,6-dipicolinic acid (DPA) [limit of detection = 0.23 nM], which is not influenced by aromatic carboxylates, amino acids, and ions.

NIR luminescent detection of quercetin based on an octanuclear Zn(ii)-Nd(iii) salen nanocluster.

A NIR luminescent octanuclear Zn(ii)-Nd(iii) nanocluster 1 was constructed by the use of a salen-type Schiff base ligand. 1 exhibits a lanthanide luminescent response to Que with high sensitivity. The quenching constant of Que to the lanthanide emission is 2.

Ratiometric fluorescent detection of dipicolinic acid as an anthrax biomarker based on a high-nuclearity Yb nanoring.

An 18-metal lanthanide nanoring [Yb(L)(HL)(OAc)(MeOH)(EtOH)(HO)] (1), which shows a ratiometric fluorescent response to DPA, was constructed through the strategy of using two types of polydentate organic ligands. The addition of DPA increases the visible ligand-centered emission, but decreases the NIR lanthanide luminescence of 1. The limit of luminescent detection of 1 for DPA is 1.

Construction of a high-nuclearity Nd(III) nanoring for the NIR luminescent detection of antibiotics.

One NIR luminescent 14-metal Nd(iii) nanoring (1, molecular size: 1.0 × 2.2 × 2.

Construction of a 18-Metal Neodymium(III) Nanoring with NIR Luminescent Sensing to Antibiotics.

One 18-metal Nd(III) nanoring, [Nd(L)(HL)(OAc)(MeOH)(EtOH)(HO)]·2(MeOH)·6(HO) (), was constructed by the use of a hexadentate Schiff base ligand. For , the near-infrared (NIR) luminescence of Nd(III) was detected under the excitation of absorption band at 371 nm. The study of luminescent sensing properties exhibits that, even with the existence of other antibiotics, this Nd(III) nanoring displays high sensitivity and selectivity to nitrofuran antibiotics (NFAs).

One High-Nuclearity Cd(II)-Yb(III) Nanoring with Near-IR Luminescent Sensing to Antibiotics.

One 12-metal Cd(II)-Yb(III) nanoring, [CdYbL(OAc)]·4OH (), with a size of 1.2 × 2.8 × 2.

Construction of a High-Nuclearity Elliptical Yb(III) Nanoring: NIR Luminescent Response to Metal Ions and Nitro Explosives.

One 14-metal Yb(III) nanoring [Yb(HL)L(DMF)(HO)] () with a size of about 1.1 × 2.5 × 2.

Construction of 14-metal lanthanide nanorings with NIR luminescence response to ions.

Two 14-metal lanthanide nanorings [Ln14(HL)2L20(DMF)8(H2O)8] (Ln = Nd(1) and Gd(2)) were constructed from a tridentate ligand. 1 displays NIR luminescence sensing properties towards metal cations and anions, especially Cu2+, Co2+, H2PO4- and F- at a ppm level.

Construction of Chiral "Triple-Decker" Nd(III) Nanocluster with High NIR Luminescence Sensitivity toward Co(II).

One Nd(III) complex [NdL(OAc)] () was synthesized from a conjugate Schiff base ligand HL. It shows a chiral "triple-decker" structure (1.1 × 1.

Construction of a crystalline 14-metal Zn-Nd rectangular nanocluster with a dual-emissive response towards metal ions.

A crystalline 14-metal Zn-Nd cluster [ZnNdL(OAc)(O)(NO)(OCH)] (1) was constructed using a flexible Schiff base ligand with long-chain (CH)O(CH)O(CH) backbone. 1 exhibits a nanoscale rectangular structure (10 × 14 × 18 Å). Besides the visible ligand-centered emission, 1 displays typical NIR luminescence of Nd.

Large Ln coordination nanorings: NIR luminescence sensing of metal ions and nitro explosives.

Two 42-metal lanthanide coordination nanorings [Ln42L14(OH)28(OAc)84] (Ln = Nd (1), La (2)) were prepared using a vanillin type ligand. The Nd42 cluster exhibits interesting NIR luminescence sensing behavior to metal ions and nitro explosives.

A self-assembling luminescent lanthanide molecular nanoparticle with potential for live cell imaging.

Four luminescent 32-metal Cd-Tb nanoclusters, [TbCd(L)(OAc)] (), [TbCd(L)(OAc)] (), [TbCd(L)(OAc)] () and [TbCd(L)(1,4-BDC)(OAc)(OH)] (), were constructed from three specially designed chain-like Schiff base ligands HL with flexible carbon-carbon backbones containing 5, 6 and 10 methylene units, respectively. The clusters exhibit drum-like structures and can be imaged using transmission electron microscopy (TEM). In addition to the Schiff base ligands (the primary energy transfer donors), four 1,4-BDC bridging units were successfully introduced into the structure of .

Detection and structural characterization of nitrosamide HNNO: A central intermediate in deNO processes.

The structure and bonding of HNNO, the simplest N-nitrosamine, and a key intermediate in deNO processes, have been precisely characterized using a combination of rotational spectroscopy of its more abundant isotopic species and high-level quantum chemical calculations. Isotopic spectroscopy provides compelling evidence that this species is formed promptly in our discharge expansion via the NH + NO reaction and is collisionally cooled prior to subsequent unimolecular rearrangement. HNNO is found to possess an essentially planar geometry, an NNO angle of 113.

Oxygen-18 Isotopic Studies of HOOO and DOOO.

Owing to questions that still persist regarding the length of the O-H and central O-O bond, and large-amplitude torsional motion of trans hydridotrioxygen HOOO, a weakly bound complex between OH and O, new O isotopic measurements of HOOO and DOOO were undertaken using Fourier transform microwave and microwave-millimeter-wave double resonance techniques. Rotational lines from three new O species of DOOO (DOOO, DOOO, and DOOO) were detected, along with the two singly substituted O isotopic species of HOOO (HOOO and HOOO) that were not measured in the previous isotopic investigation. From a least-squares fit, spectroscopic constants, including the three rotational constants, were precisely determined for all five species.

Anion dependent self-assembly of sandwich 13-metal Ni-Ln nanoclusters with a long-chain Schiff base ligand.

Two classes of Ni-Ln clusters [LnNiL(OAc)(NO)(OH)] (Ln = Gd (1) and Tb (2)) and [LnNiL(OAc)(OH)](OH) (Ln = Gd (3) and Dy (4)) were prepared using a specifically designed Schiff base ligand built around a flexible (CH)O(CH)O(CH) chain. 1 and 2 exhibit cone-like structures, while 3 and 4 have nanosized sandwich architectures. The structures were studied by single-crystal X-ray diffraction and TEM, and magnetic properties were investigated.

Enantioselective Synthesis of Oxetanes Bearing All-Carbon Quaternary Stereocenters via Iridium-Catalyzed C-C Bond-Forming Transfer Hydrogenation.

Oxetanes bearing all-carbon quaternary stereocenters are readily prepared through the iridium-catalyzed anti-diastereo- and enantioselective C-C coupling of primary alcohols and isoprene oxide. Based on this methodology, an oxetane containing analogue of haloperidol was prepared. A related azetidine formation is also described.

CO Capture from Ambient Air by Crystallization with a Guanidine Sorbent.

Carbon capture and storage is an important strategy for stabilizing the increasing concentration of atmospheric CO and the global temperature. A possible approach toward reversing this trend and decreasing the atmospheric CO concentration is to remove the CO directly from air (direct air capture). Herein we report a simple aqueous guanidine sorbent that captures CO from ambient air and binds it as a crystalline carbonate salt by guanidinium hydrogen bonding.

Three-Dimensional Printing of Photoresponsive Biomaterials for Control of Bacterial Microenvironments.

Advances in microscopic three-dimensional (μ3D) printing provide a means to microfabricate an almost limitless range of arbitrary geometries, offering new opportunities to rapidly prototype complex architectures for microfluidic and cellular applications. Such 3D lithographic capabilities present a tantalizing prospect for engineering micromechanical components, for example, pumps and valves, for cellular environments composed of smart materials whose size, shape, permeability, stiffness, and other attributes might be modified in real time to precisely manipulate ultralow-volume samples. Unfortunately, most materials produced using μ3D printing are synthetic polymers that are inert to biologically tolerated chemical and light-based triggers and provide low compatibility as materials for cell culture and encapsulation applications.