4 research outputs found
Synthesis and Characterization of Amorphous Nickel(II) Aluminosilicate
Amorphous aluminosilicates containing about 12 wto Ā°/0 nickel
have been synthesized bycation exchange. Approximately 40Ā°/0 of the nickel content is present in the form of octahedral [NiH20)6]2+ ions while the bulk of NF+ is coordinated both by I-hO molecules and by oxygen atoms of the aluminosilicate framework. When the materials are heated in air at 350 -c, a change in the nickel coordination environment/geornetry and possibly also a partial oxidation take place
Synthesis and Characterization of Amorphous Nickel(II) Aluminosilicate
Amorphous aluminosilicates containing about 12 wto Ā°/0 nickel
have been synthesized bycation exchange. Approximately 40Ā°/0 of the nickel content is present in the form of octahedral [NiH20)6]2+ ions while the bulk of NF+ is coordinated both by I-hO molecules and by oxygen atoms of the aluminosilicate framework. When the materials are heated in air at 350 -c, a change in the nickel coordination environment/geornetry and possibly also a partial oxidation take place
Hidrotermalna sinteza i struktura jednog novog slojevitog cinkofosfata interkaliranog sa 3-metilaminopropilamin-katjonom
A novel layered zincophosphate (ZnPOāMPA) was prepared by hydrothermal crystallization using 3-methylaminopropylamine (MPA) as a structure-directing agent. The structure consists of macroanion [Zn2P3O8(OH)3]2- layers which are built up of 4-membered ring channels. The channels (of about 3.7 Ć
diameter) arise through the connection of the neighbouring rings by two oxygen bridges. The negative charge of the layers is compensated by diprotonated MPA molecules which are stacked parallel to the ring channels. ZnPOāMPA is stable up to 300 Ā°C. At higher temperatures MPA decomposition begins followed by a dehydration, which occurs through condensation of the framework hydroxyl groups. The activation energy of the MPA decomposition is high due to the fact that the layers and MPA cations are held together by strong hydrogen bonds.Jedan novi slojeviti cinkofosfat (ZnPOāMPA) dobijen je hidrotermalnom kristalizacijom koriÅ”Äenjem 3-metilaminopropilamina (MPA) kao agensa za usmeravanje strukture. Struktura se sastoji od makroanjonskih slojeva [Zn2P3O8(OH)3]2- koji su izgraÄeni od kanala u vidu ÄetvoroÄlanog prstena. Kanali (preÄnika oko 3,7 Ć
) nastaju povezivanjem susednih prstenova preko kiseoniÄnih mostova. Negativno naelektrisanje slojeva kompenzovano je dvoprotonovanim MPA koji su naslagani paralelno prstenastim kanalima. ZnPOāMPA je stabilan do 300 Ā°C. Na viÅ”im temperaturama poÄinje razlaganje MPA koje je praÄeno dehidratacijom, a ova se deÅ”ava putem kondenzacije hidroksilnih grupa reÅ”etke. Energija aktivacije razlaganja MPA je velika zbog toga Å”to se slojevi i katjoni MPA uzajamno drže jakim vodoniÄnim vezama