Squaric acid, also called quadratic acid because its four carbon atoms approximately form a square, is a diprotic organic acid with the chemical formula C4O2(OH)2. [4] The conjugate base of squaric acid is the hydrogensquarate anion HC4O− 4; and the conjugate base of the hydrogensquarate anion is the divalent squarate anion C4O2− 4.

2021年10月14日 · Squarate is a carbon oxoanion which is the dianion obtained by the deprotonation of the hydroxy group of hydrogensquarate. It is a carbon oxoanion and a member of squarates. It is a conjugate base of a hydrogensquarate.

2019年5月15日 · Herein, a rigid squarate-based metal–organic framework (MOF), having a perfect pore size (4.1 Å × 4.3 Å) comparable with the kinetic diameter of Xe (4.047 Å) as well as pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity.

Zinc squarate (C 4 O 4 2−) can form a solid state compound with a layered structure when DMSO is present, [Zn(C 4 O 4)(OH 2) 2 (DMSO) 2]. The DMSO occupies the axial positions at the six-coordinate zinc center and prevents formation of a 3D cage network.

We assessed squarate selectively using the UDP-sugar processing enzyme GlfT2 from Mycobacterium tuberculosis, which possesses 21 surface-exposed lysines. The reaction predominately modified one lysine proximal to a binding site to afford covalent inhibition.

2019年2月15日 · In this work, a calcium-based metal-organic framework with high vapor-stability and thermostability, Ca (squarate), was prepared using readily available precursor (CaCO 3) and squaric acid as starting materials by hydrothermal method.

2023年6月16日 · Herein, we report a robust squarate-cobalt metal–organic framework (MOF), FJUT-3, featuring an ultra-small 1D square channel decorated with −OH groups, for CO 2 /N 2 separation. Remarkably, FJUT-3 not only has excellent stability under harsh chemical conditions but also presents low-cost property for scale-up synthesis.

2024年11月15日 · Here we present a metal-organic coordination framework assembled by Ni 4 O 4 -cubane unit and squaric acid, denoted as USTC-740 (USTC: University of Science and Technology of China). It possesses...

2024年10月18日 · Their non-centrosymmetric crystal structure induces a higher-order nonlinear optical response, which guarantees technological applications. ZnII– and AgI–squarate complexes are attractive templates for these purposes due to their good crystal growth, optical transparency, high thermal stability, etc.

Sodium squarate is an organic sodium salt which is the disodium salt of squaric acid. It contains a squarate.