In chemistry, a coordination complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents. Many metal-containing compounds, especially those of transition metals, are coordination complexes. A coordination complex whose centre is a metal atom is called a metal complex.
In coordination chemistry, a ligand is an ion or molecule that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs. The nature of metal–ligand bonding can range from covalent to ionic. Furthermore, the metal–ligand bond order can range from one to three. Ligands are viewed as Lewis bases, although rare cases are known to involve Lewis acidic "ligands".
A coordinate covalent bond, also known as a dative bond or coordinate bond is a kind of 2-center, 2-electron covalent bond in which the two electrons derive from the same atom. The bonding of metal ions to ligands involves this kind of interaction. This type of interaction is central to Lewis acid-base theory.
In linguistics, the comparative is a syntactic construction that serves to express a comparison between two entities or groups of entities in quality or degree - see also comparison (grammar) for an overview of comparison, as well as positive and superlative degrees of comparison. For example This sofa is more comfortable than that one and James is smaller than Chris. The syntax of comparative constructions is poorly understood due to the complexity of the data. In particular, the comparative frequently occurs with independent mechanisms of syntax such as coordination and forms of ellipsis. The interaction of the various mechanisms complicates the analysis.
In linguistics, a subject pronoun is a personal pronoun that is used as the subject of a verb. Subject pronouns are usually in the nominative case for languages with a nominative–accusative alignment pattern. On the other hand, a language with an ergative-absolutive pattern usually have separate subject pronouns for transitive and intransitive verbs: an ergative case pronoun for transitive verbs and an absolutive case pronoun for transitive verbs.
In game theory, coordination games are a class of games with multiple pure strategy Nash equilibria in which players choose the same or corresponding strategies.
The United Nations Office for the Coordination of Humanitarian Affairs (OCHA) is a United Nations (UN) body formed in December 1991 by General Assembly Resolution 46/182. The resolution was designed to strengthen the UN's response to complex emergencies and natural disasters. Earlier UN organizations with similar tasks were the Department of Humanitarian Affairs (DHA), and its predecessor, the Office of the United Nations Disaster Relief Coordinator (UNDRO). In 1998, due to reorganization, DHA merged into OCHA and was designed to be the UN focal point on major disasters. It is a sitting observer of the political debate United Nations Development Group.
The term coordination geometry is used in a number of related fields of chemistry and solid state chemistry/physics.
The LX Legislature (60th) of the Congress of Mexico met from September 1, 2006, to September 1, 2009. All members of both the lower and upper houses of Congress were elected in the elections of July 2006.
The Microsoft Distributed Transaction Coordinator (MSDTC) service is a component of modern versions of Microsoft Windows that is responsible for coordinating transactions that span multiple resource managers, such as databases, message queues, and file systems. MSDTC is included in Windows 2000 and later operating systems, and is also available for Windows NT 4.0.
In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand. This number is determined somewhat differently for molecules than for crystals.
Wabun Tribal Council is a non-profit Regional Chiefs' Council representing Ojibway and Cree First Nations in northern Ontario, Canada. The Council provides advisory services and program delivery to its seven Status and non-Status member-Nations.
The Central Leading Group for Taiwan Affairs is an internal policy coordination group of the Central Committee of the Communist Party of China and the State Council of the People's Republic of China, reporting to the Politburo, in charge of supervising and coordinating Beijing's policy towards Taiwan, including developing cross-strait relations. It was established in 1979 and has been led by the General Secretary of the Communist Party of China since 1989.
The United Nations-Oceans is an inter-agency coordination mechanism of the United Nations, set up to enhance cooperation and coordination of activities concerned with the world oceans and coasts. The UN-Oceans was formed in September 2003 by the United Nations System Chief Executive Board (CEB), to replace the Sub-Committee on Oceans and Coastal Areas (SOCA) of the Administrative Committee on coordination (ACC) that was formed in 1993.
Coordinating Ministry for Human Development and Cultural Affairs is an Indonesian coordinating ministry. The ministry has the function to coordinate, synchronized and control governance in human development and culture.
The first shadow cabinet of the Federal Parliament of Nepal was formed by main opposition party Nepali Congress on 20 May, 2019.
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