Adipamide

Abstract: The invention concerns the preparation of white polyamides of high molecular weight based substantially on 1.4-diaminobutane and adipic acid. They are prepared by subjecting prepolymers, which contain less than 0.20 mgeq/g of cyclic (pyrrolidinyl) end groups and which have been prepared using an excess of the diamine. to aftercondensation in the solid phase in an atmosphere containing water vapour. The presence of water vapour is essential to prevent discoloration. The polyamides thus obtained can be used as engineering plastic or for the production of fibers.

Abstract: A process for the preparation of white nylon 4,6 polyamide of high molecular weight from a tetramethylenediamine adipic acid prepolymer, formed under controlled conditions of temperature and water vapor pressure and wherein the plurality of cyclical end-groups in the prepolymer does not exceed 0.20 mg. equivalent per gram of prepolymer.

Abstract: Ten multifunctional cobalt(II) coordination polymers with the formulas of [Co(L1)0.5(5-AIP)]·H2O (1), [Co(L2)(5-AIP)(H2O)2] (2), [Co(L3)0.5(5-AIP)] (3), [Co(L4)0.5(5-AIP)(H2O)]·2H2O (4), [Co(L5)(5-AIP)] (5), [Co(HBTC)(L3)]·H2O (6), [Co(HBTC)(L6)(H2O)]·3H2O (7), [Co(L2)(1,3-BDC)(H2O)2] (8), [Co2(L3)2(1,3-BDC)2]·4H2O (9), and [Co2(L4)1.5(1,2-BDC)(μ2-OH)(μ3-OH)(H2O)]·H2O (10) have been prepared by a hydrothermal technique employing six flexible bis(pyridylamide) ligands with different spacers (L1 = N,N′-bis(3-pyridyl)oxamide, L2 = N,N′-bis(3-pyridyl)malonamide, L3 = N,N′-di(3-pyridyl)succinamide, L4 = N,N′-bis(3-pyridyl)adipamide, L5 = N,N′-bis(3-pyridyl)heptandiamide, L6 = N,N′-bis(3-pyridyl)sebacicdiamide) and four aromatic polycarboxylic acids mixed ligands (5-H2AIP = 5-aminoisophthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid, 1,3-H2BDC = 1,3-benzenedicarboxylic acid, and 1,2-H2BDC = 1,2-benzenedicarboxylic acid). Compound 1 exhibits a two-dimensional (2D) double-layer network. Compounds 2 and 8 are...