Konsep Proses Pemesinan Berkelanjutan

Metal industrial machining usually strongth pressure from all sectors, ether raw material industries or user metal industries. Manufacturint process which offered to all sectors industries or companies that sustainable manufakturing consist of three main factor are efective cost, enviroment and social performance

Fusing High Symmetric Coordination Polyhedrons of Cu₆(PIP)₄, Cu₁₂(PIP)₈, and Cu₁₂(PIP)₂₄ into an Unprecedented Porous MOF: Synthesis, Structure, and Its Remarkable CO₂ Selectivity

An unprecedented metal–organic framework, NJU-Bai6, formed by piling up the nanocages Cu₆(PIP)₄, Cu₁₂(PIP)₈, and Cu₁₂(PIP)₂₄ through sharing faces of the “opened” triangular and square windows, has been designed and structurally characterized. Very interestingly, it exhibits the third highest selectivity of CO₂ over N₂ with the value about 60 at room temperature

Fusing High Symmetric Coordination Polyhedrons of Cu₆(PIP)₄, Cu₁₂(PIP)₈, and Cu₁₂(PIP)₂₄ into an Unprecedented Porous MOF: Synthesis, Structure, and Its Remarkable CO₂ Selectivity

An unprecedented metal–organic framework, NJU-Bai6, formed by piling up the nanocages Cu₆(PIP)₄, Cu₁₂(PIP)₈, and Cu₁₂(PIP)₂₄ through sharing faces of the “opened” triangular and square windows, has been designed and structurally characterized. Very interestingly, it exhibits the third highest selectivity of CO₂ over N₂ with the value about 60 at room temperature

Isolation and X‑ray Crystal Structures of Triarylphosphine Radical Cations

Salts containing triarylphosphine radical cations <b>1</b>^<b>•+</b> and <b>2</b>^<b>•+</b> have been isolated and characterized by electron paramagnetic resonance (EPR) and UV–vis absorption spectroscopy as well as single-crystal X-ray diffraction. Radical <b>1</b>^<b>•+</b> exhibits a relaxed pyramidal geometry, while radical <b>2</b>^<b>•+</b> becomes fully planar. EPR studies and theoretical calculations showed that the introduction of bulky aryl groups leads to enhanced p character of the singly occupied molecular orbital, and the radicals become less pyramidalized or fully flattened

Isolation and X‑ray Crystal Structures of Triarylphosphine Radical Cations

Salts containing triarylphosphine radical cations <b>1</b>^<b>•+</b> and <b>2</b>^<b>•+</b> have been isolated and characterized by electron paramagnetic resonance (EPR) and UV–vis absorption spectroscopy as well as single-crystal X-ray diffraction. Radical <b>1</b>^<b>•+</b> exhibits a relaxed pyramidal geometry, while radical <b>2</b>^<b>•+</b> becomes fully planar. EPR studies and theoretical calculations showed that the introduction of bulky aryl groups leads to enhanced p character of the singly occupied molecular orbital, and the radicals become less pyramidalized or fully flattened

Isolation and X‑ray Crystal Structures of Triarylphosphine Radical Cations

Salts containing triarylphosphine radical cations <b>1</b>^<b>•+</b> and <b>2</b>^<b>•+</b> have been isolated and characterized by electron paramagnetic resonance (EPR) and UV–vis absorption spectroscopy as well as single-crystal X-ray diffraction. Radical <b>1</b>^<b>•+</b> exhibits a relaxed pyramidal geometry, while radical <b>2</b>^<b>•+</b> becomes fully planar. EPR studies and theoretical calculations showed that the introduction of bulky aryl groups leads to enhanced p character of the singly occupied molecular orbital, and the radicals become less pyramidalized or fully flattened

Unprecedented Boron-Functionalized Carborane Derivatives by Facile and Selective Cobalt-Induced B–H Activation

The 16-electron complex CpCoS₂C₂B₁₀H₁₀ (<b>1</b>) is found to react with the alkynes HCCC­(O)­R [R = methyl (Me), phenyl (Ph), styryl (St), ferrocenyl (Fc)] at ambient temperature to give two types of 17-electron cobalt complexes <b>2a</b>–<b>d</b> and <b>3a</b>–<b>d</b> containing unique B(3)/B(6)-norbornyl carborane moieties. A formation mechanism via a tandem sequence of metal-induced B–H activation, B–Cp formation, Cp delivery and Diels–Alder addition is proposed on the basis of DFT calculations. The reactivity of these paramagnetic 17-electron complexes has been studied: Exposed to a combination of air, moisture and silica, complexes <b>2a</b>–<b>d</b> undergo alkyl C–S cleavage to give 16-electron complexes <b>4a</b>–<b>c</b> containing a boron-norbornadienyl moiety, and simultaneous carboranyl C–S cleavage to afford cobalt-free carborane derivatives <b>5a</b>–<b>d</b> containing a boron-norbornyl unit. Both <b>2a</b>–<b>d</b> and <b>3a</b>–<b>d</b> allow further alkyne insertion into the Co–S bond to generate cobalt-free boron–norbornyl carborane derivatives (<i>Z</i>/<i>E</i>)-<b>7a</b>–<b>d</b> and (<i>Z</i>/<i>E</i>)-<b>8a</b>–<b>d</b>, both containing a vinyl sulfido group. Addition of AlCl₃ not only promotes the conversion of <b>2a</b>–<b>d</b>, but also leads predominantly to (<i>E</i>)-<b>9a</b>–<b>d</b> as retro-Diels–Alder products. Upon heating, the isomerization from <i>E</i> to <i>Z-</i>configuration of the vinyl group and reorganization of the norbornyl moiety of (<i>Z</i>/<i>E</i>)-<b>7a</b>–<b>d</b> occur to lead to (<i>Z</i>)-<b>9a</b>–<b>d</b> as well as the unexpected [1,2]-H shifted products (<i>Z</i>)-<b>10b</b>,<b>c</b>. Thus, the 17-electron complexes <b>2a</b>–<b>d</b> and <b>3a</b>–<b>d</b> serve as intermediates for synthesis of variety of boron-functionalized carborane derivatives. In this study, efficient routes have been developed through cobalt-mediated B–H activation to prepare boron-functionalized carborane derivatives that are unavailable by conventional routes

Syntheses, Structures, Photochemical and Magnetic Properties of Novel Divalent Cd/Mn Coordination Polymers Based on a Semirigid Tripodal Carboxylate Ligand

The reactions of a semirigid tripodal carboxylic ligand, 3,5-bi­(4-carboxy-phenoxy)-benzoic acid (H₃BCPBA) with Cd­(NO₃)₂/Mn­(NO₃)₂ afford five novel complexes, {[Cd₃(BCPBA)₂·(DMA)₂­·(H₂O)₅]·7H₂O·2DMA}_<i>n</i> (<b>1</b>), {[Cd₃(BCPBA)₂(L¹)­(H₂O)₆]·(L¹)}_<i>n</i> (L¹ = 4-[(E)-4-pyridinylazo]­pyridine) (<b>2</b>), {[Cd₃(BCPBA)₂(L²)­·(H₂O)₃(DMF)₂]·2DMF}_<i>n</i> (L² = 1,3-bis­(4-pyridyl)­propane) (<b>3</b>), {[Mn₃(BCPBA)₂(H₂O)₄]·11H₂O}_<i>n</i> (<b>4</b>), {[Mn₃(BCPBA)₂(DMF)₂(H₂O)₂]­·2DMF·9H₂O}_<i>n</i> (<b>5</b>) in the presence or absence of an auxiliary ligand. Compound <b>1</b> is a three-dimensional (3D) structure with 3,4-connected net structure. Compound <b>2</b> possesses 3D networks with two 3D → 3D interpenetration frameworks. Compound <b>3</b> is a 3D sheet structure with a decorated tfz-d topology. Compound <b>4</b> is a 3D structure which consists of a two-dimensional (2D) Mn honeycomb net with six infinite Mn rings and BCPBA^3– ligands. Compound <b>5</b> is also a 3D structure, while its 2D Mn honeycomb net with eight infinite Mn rings is different from that of compound <b>4</b>. The photochemical property of <b>1</b>–<b>3</b> is performed in the solid state at room temperature. Magnetic susceptibility measurements indicate that compounds <b>4</b> and <b>5</b> exhibit antiferromagnetic coupling between adjacent Mn­(II) ions

Three 2D/2D → 2D or 3D Coordination Polymers: Parallel Stacked, Interpenetration, and Polycatenated

Three fascinating coordination polymers, {[Zn₂(TPPBDA)­(HCO₂^–)₄]·2H₂O}_<i>n</i> (<b>1</b>), {[Zn­(TPPBDA)_1/2(4,4′-sdb)]·2H₂O }_<i>n</i> (<b>2</b>), and {[Zn­(TPPBDA)_1/2(oba)·2DMF·2H₂O]}_<i>n</i> (<b>3</b>), have been successfully synthesized and characterized by the self-assembly of the TPPDBA ligand as well as Zn²⁺ metal salts, or in the presence of carboxylate ligands (TPPDBA = <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetrakis­(4-(4-pyridine)-phenyl) biphenyl-4,4′-diamine), 4,4′-H₂sdb = 4,4′-sulfonyldibenzoate, 4,4′-H₂oba = 4,4′-oxybis­(benzoate), DMF = <i>N</i>,<i>N</i>-dimethylformamide). In complex <b>1</b>, the 2D ABAB parallel stacked network in which left- and right-handed helical chains coexist and array alternately (2D_chiral/2D_chiral → 2D_achiral) makes <b>1</b> give rise to a new interesting 2D interwoven network. Complex <b>2</b> exhibits a 2D + 2D → 2D parallel interpenetrated network. For compound <b>3</b>, the polycatenation among the 2D layer further extends the 2D net into a 3D framework

Syntheses, Structures, Photochemical and Magnetic Properties of Novel Divalent Cd/Mn Coordination Polymers Based on a Semirigid Tripodal Carboxylate Ligand

The reactions of a semirigid tripodal carboxylic ligand, 3,5-bi­(4-carboxy-phenoxy)-benzoic acid (H₃BCPBA) with Cd­(NO₃)₂/Mn­(NO₃)₂ afford five novel complexes, {[Cd₃(BCPBA)₂·(DMA)₂­·(H₂O)₅]·7H₂O·2DMA}_<i>n</i> (<b>1</b>), {[Cd₃(BCPBA)₂(L¹)­(H₂O)₆]·(L¹)}_<i>n</i> (L¹ = 4-[(E)-4-pyridinylazo]­pyridine) (<b>2</b>), {[Cd₃(BCPBA)₂(L²)­·(H₂O)₃(DMF)₂]·2DMF}_<i>n</i> (L² = 1,3-bis­(4-pyridyl)­propane) (<b>3</b>), {[Mn₃(BCPBA)₂(H₂O)₄]·11H₂O}_<i>n</i> (<b>4</b>), {[Mn₃(BCPBA)₂(DMF)₂(H₂O)₂]­·2DMF·9H₂O}_<i>n</i> (<b>5</b>) in the presence or absence of an auxiliary ligand. Compound <b>1</b> is a three-dimensional (3D) structure with 3,4-connected net structure. Compound <b>2</b> possesses 3D networks with two 3D → 3D interpenetration frameworks. Compound <b>3</b> is a 3D sheet structure with a decorated tfz-d topology. Compound <b>4</b> is a 3D structure which consists of a two-dimensional (2D) Mn honeycomb net with six infinite Mn rings and BCPBA^3– ligands. Compound <b>5</b> is also a 3D structure, while its 2D Mn honeycomb net with eight infinite Mn rings is different from that of compound <b>4</b>. The photochemical property of <b>1</b>–<b>3</b> is performed in the solid state at room temperature. Magnetic susceptibility measurements indicate that compounds <b>4</b> and <b>5</b> exhibit antiferromagnetic coupling between adjacent Mn­(II) ions