本文对高中化学常规教学的微项目化改进进行研究,分析改进的方向,从学习目标的任务性、学习情境的真实性、学生活动的主体性、任务结果的可视性四个方面展开对微项目改进策略的讨论,并给出实施建议,期望在不对常规教学条件增加较多要求的情况下,改造课堂学习任务,融入项目式学习的主要特征,达成促进学生核心素养形成的目的.

依据化学学科核心素养的内涵与培养要求,从引导学生形成正确价值观、培养科学思维和创新意识等角度,对中学化学课堂教学中如何选择运用与社会生产、生活有关的素材,创设真实且有价值的学习情境进行探讨.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Two new cobalt(II) supramolecular complexes [Co(4,4'-bipy)(2)(H2O)(4)]center dot[Co-2(4,4'-bipy)(3)(H2O)(8)]center dot 2TST center dot 2(4,4'-bipy)-4H(2)O 1 and (Co(4,4'-bipy)(2)(H2O)(4)]DSNT-4,4'-bipy 2 based upon the assembly of Co(II), 4,4'-bipyridine (4,4'-bipy) and two new multifunctional organic ligands, 2,4,6-tris(4-sulfophenyl-amino)- 1,3,5-triazine (H3TST) and 2,4-bis(p-sulfanilato)-6-diethylamino-1,3,5-triazine (H2DSNT), have been prepared by hydrothermal method and characterized by elemental analysis, IR spectrum, and single-crystal X-ray diffraction. The crystal structure of 1 is of monoclinic, space group P21/n with a = 13.599(4), b = 18.988(6), c = 22.995(7) angstrom, beta = 90.273(6)degrees, V = 5938(3) angstrom(3), Z = 4, C56H59Co1.5M3O17S3, M-r = 1370.74, D-c = 1.533 g/cm(3), mu = 0.613 mm(-1), F(000) = 2842, GOOF = 1.018, the final R = 0.0796 and wR = 0.1498 for 9019 observed reflections with I > 2 sigma(I). The crystal structure of 2 belongs to the monoclinic system, space group C2/c with a = 18.864(6), b = 14.283(5), c = 20.246(7) angstrom, beta = 107.799(6)degrees, V = 5194(3) angstrom(3), Z = 4, C49H52CoN12O10S2, M-r = 1092.08, D-c = 1.397 g/cm(3), mu = 0.480 mm(-1), F(OOO) = 2276, GOOF= 1.059, the final R = 0.0665 and wR = 0. 1900 for 4887 observed reflections with I > 2 sigma(I). The results of X-ray crystal structure analysis revealed that complexes I and 2 exhibit layered supramolecular frameworks stabilized by electrostatic interactions, pi-pi interactions and hydrogen bonds.

Two novel cobalt(II) coordination polymers [Co-2(H2O)(4)(Hbidc)(2)](n) (1) and [Co(Hbidc)](n) (2), (Hbidc = 1H-benzimidazole-5,6-dicarboxylate) were synthesized hydrothermally by treating CoSO4 and H(3)bidc at 160 or 220 degrees C, respectively. X-Ray diffraction analyses showed that compound 1 is a 1-D chain polymer with dimer units [Co-2(H2O)(4)(Hbidc)(2)] and the infinite chains of compound 1 array uniformly towards the crystallographic a-axis in a 3-D supramolecular framework which possesses abundant hydrogen-bonding interactions between uncoordinated carboxylo-oxygen atoms and coordinated water molecules or N-H groups in imidazole rings. Compound 2 is a novel five-coordinated cobalt(II) chain compound exhibiting a 2-D polymeric network with parallel zip-like cobalt-carboxylate chains along the crystallographic b-axis and the 2-D polymeric networks of compound 2 exhibit a layered arrangement, in which the strong hydrogen-bonding interaction between uncoordinated carboxylo-oxygen atoms and N-H groups in the imidazole rings play a key role in the final 3-D supramolecular architectures. Magnetic studies revealed that compound 1 shows a ferromagnetic coupling between two Co-II ions in the dimer unit and compound 2 exhibits an antiferromagnetic property.

A novel five-coordinated Mn(II) polymer 1H-benzimidazole-5,6-dicarboxylato manganese (II) ([Mn(Hbidc)], 1) possessing abundant hydrogen bonds and pi-pi stacking interactions, synthesized by the hydrothermal reaction between MnSO4 and a multifunctional organic aromatic ligand H(3)bidc, displays antiferromagnetic character, strong long-lived red luminescence (lambda(max) = 726 nm and tau = 0.3 ms) as well as high thermal stability (up to ca. 500 degrees C).

Novel mononuclear, trinuclear, and hetero-trinuclear supermolecular complexes, [Co(phen)2(H2O)(HTST)]·2H2O (1), [Co3(phen)6(H2O)2(TST)2]·7H2O (2), and [Co2Cu(phen)6(H2O)2(TST)2]·10H2O (3), have been synthesized by the reactions of a new tri-sulfonate ligand (2,4,6-tris(4-sulfophenylamino)-1,3,5-triazine, H3TST) with the M2+ (M=Co, Cu) and the second ligand 1,10-phenanthroline (phen). Complex 1 contains a cis-Co(II)(phen)2 building block and an HTST as monodentate ligand; complex 2 consists of two TST as bidentate ligands connecting one trans- and two cis-Co(II)(phen)2 building blocks; complex 3 is formed by replacing the trans-Co(II)(phen)2 in 2 with a trans-Cu(II)(phen)2, which is the first reported hetero-trinuclear supramolecular complex containing both the Co(II)(phen)2 and Cu(II)(phen)2 as building blocks. The study shows the flexible multifunctional self-assembly capability of the H3TST ligands presenting in these supramolecular complexes through coordinative, H-bonding and even π–π stacking interactions. The photoluminescent optical properties of these complexes are also investigated and discussed as well as the second-order nonlinear optical properties of 1.

The novel supramolecular silver(I) compound with formula [Ag6(TST)2(bipy)6(H2O)2]n·3nH2O (1) based on assembly of Ag(I) and mixed ligand bipy/TST3−, bipy=2,2′-bipyridine, H3TST=2,4,6-tris(4-sulfophenylamino)-1,3,5-triazine, has been prepared by hydrothermal method. In the solid-state structure of 1, two-dimensional layered polymeric structures extended with subunits [Ag6(TST)2(bipy)6(H2O)2] interact each other in the form of π–π attractions between bipy, forming a three-dimensional supramolecular architecture. Compound 1 represents a Ag-containing polymeric compound possessing room-temperature luminescence.

The hydrothermal reaction of Co(NO3)2·6H2O and a new designed ligand H2DCNT yields a three-dimensional polymer [Co(DCNT)(H2O)]n (1), H2DCNT=2,4-bis(4-carboxyphenylamino)-6-diethylamino-1,3,5-triazine. In the structure of 1, each DCNT2− has three coordination sites, one nitrogen atom in the triazine ring coordinating to Co(II) and two carboxylates adopting μ2-bridging mode, which make the infinite Co(II) chains array uniformly and evenly toward crystallographic c-axis. Luminescent and magnetic properties of 1 were also studied.

In the title complex, [Ni(C21H16N6O9S3)(C12H8N2)(2)(H2O)]center dot 2H(2)O or [Ni(HTST)(phen)(2)(H2O)]center dot 2H(2)O, where H3TST is 2,4,6-tris(4-sulfophenylamino)-1,3,5-triazine and phen is phenanthroline the Ni-II ion is in a distorted octahedral, coordination environment defined by four N atoms from two phen ligands, one O atom from an aqua ligand and one O atom from the SO3 group of an HTST ligand. In the crystal structure, intermolecular N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds connect molecules to form a two-dimensional network.

A novel 7-fold interpenetration diamondoid network neutral coordination polymer [Mn(NCP)(2)](n) (HNCP = 2-(4carboxyphenyl)imidazo(4,5-f)(1,10)phenanthroline), synthesized by the hydrothermal reaction between MnSO4 and a new designed multifunctional ligand HNCP, displays a second harmonic generation efficiency that is approximately three times as much as that of potassium dihydrogen phosphate (KDP), weak antiferromagnetic character, and strong fluorescence emission with lambda(max) at 588 nm as well as high thermal stability (up to ca. 490 degrees C).

In the title complex, [Ni(C 21 H 16 N 6 O 9 S 3 )(C 12 H 8 N 2 ) 2 (H 2 O)]·2H 2 O or [Ni(HTST)(phen) 2 (H 2 O)]·2H 2 O, where H 3 TST is 2,4,6-tris(4-sulfophenylamino)-1,3,5-triazine and phen is phenanthroline, the Ni II ion is in a distorted octahedral coordination environment defined by four N atoms from two phen ligands, one O atom from an aqua ligand and one O atom from the SO 3 group of an HTST ligand. In the crystal structure, intermolecular N—H...O and O—H...O hydrogen bonds connect molecules to form a two-dimensional network.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.