The isolobal principle (also known as isolobal analogy) is way to predict bonding properties of organometallic compounds. In organometallic chemistry, it relates the structure of organic ligands that can bind to inorganic molecular fragments. Roald Hoffmann described molecular fragments as isolobal "if the number, symmetry properties, approximate energy and shape of the frontier orbitals and the number of electrons in them are similar – not identical, but similar." One can predict the bonding and reactivity of a lesser-known pieces from that of a better-known pieces if the two molecular fragments have similar frontier orbitals, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Isolobal compounds are analogs to isoelectronic compounds that share the same number of valence electrons and structure. A graphic representation of isolobal structures, with the isolobal pairs connected through a double-headed arrow with half an orbital below, is found in Figure 1.
For his work on the isolobal analogy, Hoffmann was awarded the Nobel Prize in Chemistry in 1981, which he shared with Kenichi Fukui. In his Nobel Prize lecture, Hoffmann stressed that the isolobal analogy is a useful, yet simple, model. It does fail in certain instances.
Alcibiades
Alcibiades, son of Clinias, "c." 450–404 BC), was a prominent Athenian statesman, orator, and general. He was the last famous member of his mother's aristocratic family, which fell from power after the Peloponnesian War. He played a major role later in that conflict as a strategic advisor, military commander, and politician.
During the course of the Peloponnesian War, Alcibiades changed sides on several occasions. In his native Athens in the early 410s BC, he advocated an aggressive foreign policy, and spoke in favor of an invasion of Sicily. He fled to Sparta after his political enemies brought charges of sacrilege against him.
In Sparta, he served as a strategic adviser, proposing or supervising several major campaigns against Athens. In Sparta too, however, Alcibiades soon made powerful enemies and was forced to defect to Persia. There he served as an adviser to the satrap Tissaphernes until his Athenian political allies brought about his recall. He then served as an Athenian general for several years, but his enemies eventually succeeded in exiling him a second time.
The Sicilian Expedition to Magna Graecia was Alcibiades' idea but his enemies prevented him from commanding. His rival Nicias took command, and the expedition failed disastrously. In the years that he served Sparta, Alcibiades played a role in Athens' undoing; the capture of Decelea and the revolts of several critical Athenian subjects occurred either at his suggestion or under his supervision.
Once restored to his native city, however, he played a crucial role in a string of Athenian victories that eventually brought Sparta to seek a peace with Athens. He favored unconventional tactics, frequently winning cities over by treachery or negotiation rather than by siege. Alcibiades' military and political talents frequently proved valuable to whichever state he worked for. His talent for making powerful enemies ensured that he never remained in one place for long. By the end of the war (which he had helped rekindle in the early 410s) his days of political power were a bygone memory.
In his youth Alcibiades had been a pupil of Socrates. This was something which told against Socrates at his trial.
Enamorada de Ti
"Enamorada de Ti" () is a song recorded by American singer Selena. The song was written by Selena's brother who was the producer of her music A.B. Quintanilla III. The song was also written by a Selena y Los Dinos band member Pete Astudillo. It was for her second studio album "Ven Conmigo" (1990). The song is about a women who has strong emotions for a man. She exclaims that without him, she will have nothing.
The song was not an official single. However, it did peak at number 32 on the Mexican Singles Chart. The song also appealed to a younger crowd. This helped Tejano music to be liked by many young adults. Many LGBT Selena fans had done many cover versions of "Enamorada de Ti", who had been performed the song during many drag shows across America. "Enamorada de Ti" was given positive feedback from music critics. Many of them wrote about how the song was the first freestyle song to be mixed with Tejano. Selena had promoted the song on her Ven Conmigo Tour, which lasted from 1990-1992.
"Enamorada de Ti" was recorded at JAG Records in San Antonio, Texas. The studio was rented for two days by EMI Latin for Selena to record several songs. Selena's brother, A.B. Quintanilla III had written the song. Quintanilla III had help from Pete Astudillo, who once was a backup dancer for Selena y Los Dinos. A family friend Brian "Red" Moore remixed the song. Quintanilla III had to name the song "Enmorada de Ti". By doing this, "Enamorada de Ti" became the second song by Selena to have this title. The first song that was titled "Enamorada de Ti" was on Selena's independent album "Muñequito de Trapo" (1986), which had a different meaning.
The song is about a women who is in love with a man and can not control her feelings for him. She is in love with a man who is no longer near her, she tells him that she can't live without him and that his love helps relive her depression that she has. The song is a mid-tempo song that is performed in C major with 112 beats per minute. It uses the electronic keyboard and the electric guitar as its main musical instruments.
The song had became the first Tejano song to be in freestyle. Selena had wanted to sing songs that could appeal to younger audiences. Quintanilla III had introduced a new "type" of sound into Tejano music. This helped to attract younger people to Tejano, which was not liked before by young adults. Quintanilla III was credited and awarded for this at the Tejano Music Awards.
The song was not released as an official single, however it managed to peak at number 32 on the Mexican Singles Chart. It stood on the chart for only ten weeks. The song failed to impact any other music chart. Quintanilla III was awarded "Songwriter of the Year" for "Baila Esta Cumbia", "No Quiero Saber", "Ya Ves" and "Enamorada de Ti"; at the 1991 Tejano Music Awards. Selena promoted "Enamorada de Ti" during her Ven Conmigo Tour, which lasted from 1990-1992. She had first performed the song during the 1990 Tejano Music Awards. Javier Lopez, who is an editor for "TVyNovelas", stated that Selena's performance of the song was one of best performed dance-moves that night.
Selena had choreographed dance moves. Selena also copied Micheal Jackson's moonwalk. She also had copied Janet Jackson's "Rhythm Nation" dance move. That night she had won "Female Vocalist of the Year" and "Female Entertainer of the Year". Selena had performed the song on the Spanish-language television show called "Bailando" in October 1992. She also had performed the song during the 1992 Lo Nuestro Awards in Miami, Florida. Her final performance was at her Los Angeles, California concert. She performed the song as her first number in November 1993.
The song has been covered by LGBT Selena fans. The song was also performed in many drag shows across the United States.
Carla Manuela Dejesus, who is an editor for "Furia Musical", stated that "Enamorada de Ti" was one of the "best freestyle-tejano songs" in Tejano history. Sebastian Rodriguez, who is an editor for "TVyNovelas", wrote that "Enamorada de Ti" was one of the best songs composed for "Ven Conmigo". He also stated that it showed people where Tejano music was heading into. Mario Tarradell, who is an editor for "The Dallas Morning News", stated that "Enamorada de Ti" is a catchy "dance-pop croker".
Cold cathode