Spin Crossover in [Fe(qsal-5-Br)] Complexes with a Quinoline-Substituted Qsal Ligand.

Using a quinoline substituted Qsal ligand, Hqsal-5-Br (Hqsal-5-Br = N-(5-bromo-8-quinolyl)salicylaldimine), four Fe complexes, [Fe(qsal-5-Br)]A·CHOH (Y = NO (), BF (), PF (), OTf (), were prepared and characterized. Structure analysis revealed that complex contained two species ((̅) and ()). In these compounds except , the [Fe(qsal-5-Br)] cations form 1D chains through π-π interactions and other weak interactions.

The effect of conjugation degree of aromatic carboxylic acids on electronic and photo-responsive behaviors of naphthalenediimide-based coordination polymers.

Three novel naphthalenediimide-based (NDI-based) coordination polymers (CPs), namely [Cd(3-PMNDI)(2,2'-BPDC)] (1), [Cd(3-PMNDI)(4,4'-BPDC)(HO)]·DMF (2) and [Cd(3-PMNDI)(4,4'-SDC)] (3) (2,2'-HBPDC = 2,2'-biphenyldicarboxylic acid, 4,4'-HBPDC = 4,4'-biphenyldicarboxylic acid, 4,4'-HSDC = 4,4'-stilbenedicarboxylic acid, 3-PMNDI = ,'-bis(3-pyridylmethyl)-1,4,5,8-naphthalenediimide, and DMF = ,'-dimethylformamide), have been designed and synthesized here from electron-deficient PMNDI (electron acceptors, EAs) and electron-rich aromatic carboxylic acids (electron donors, EDs) in the presence of cadmium ions. The introduction of aromatic carboxylic acids with different sizes and conjugation degrees leads to the generation of a two-dimensional (2D) layer in 1, a two-fold interpenetrated three-dimensional (3D) network in 2 and an eight-fold interpenetrated 3D framework in 3. Furthermore, the use of distinct electron-donating aromatic carboxylic acids and the consequent different numbers and strengths of lone pair-π and π-π interactions in the interfacial contacts of EDs/EAs give rise to distinct intermolecular charge transfer (ICT) and initial colors of the three CPs, and consequently cause different photoinduced intermolecular electron transfer (PIET) and distinguishing photo-responsive behaviors (weak photochromic performance for 1, excellent photochromic properties for 2 and non-photochromism for 3).

Linking green supply chain management practices with competitiveness during covid 19: The role of big data analytics.

Although the global green supply chain management (GSCM) practice has attracted considerable scholarly attention, its efficacy for environmental management systems (EMS) and market competitiveness during Covid-19 has not been fully capitalized. Therefore, the existing literature indicates that the important link between GSCM, EMS, and market competitiveness is missing as supply management is crucial to maintaining market competitiveness. To fill this research gap, the current study examines whether EMS affects the relationship between GSCM practices and market competitiveness.

An electron-deficient naphthalene diimide-based metal-organic framework for detecting electron-rich molecules through photo-/chemo-induced chromism.

A novel naphthalene diimide-based metal-organic framework (MOF) {[Zn(3-DPMNI)(NDC)]·3DMF} (1@DMF), (HNDC = 2,6-naphthalenedicarboxylic acid, DPMNI = ,'-bis(3-pyridylmethyl)-1,4,5,8-naphthalene diimide, DMF = ,'-dimethylformamide), has been synthesized, which shows a 3D pillar-layer architecture built of carboxylate layers and naphthalene diimide pillars. The compound exhibits outstanding photochromic performance due to photoinduced electron transfer (ET) between the electron-rich guest molecules and electron-deficient host framework (host-guest ET). Of note, the host framework of 1 cannot show a macroscopic color change owing to the absence of the ET pathway.