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==Senyawa setengah sandwich==
{{utama|Senyawa setengah sandwich}}
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====Monometallic half sandwich compounds====
 
====Senyawa monologam setengah sandwich====
[[Image:MMT-3D-balls.png|thumb|right|[[Ball-and-stick model]] of methylcyclopentadienyl manganese tricarbonyl, a "piano stool" compound]]
[[Metallocene]]s including just one facially-bound planar organic [[ligand]] instead of two gives rise to a still larger family of '''half sandwich''' compounds. The most famous example is probably [[methylcyclopentadienyl manganese tricarbonyl]]. Such species are occasionally referred to as '''piano stool compounds,''' at least when there are three diatomic ligands in addition to the hydrocarbon "seat" of the piano stool. The name derives from the similarity of the structure to such a "stool" with the seat being a facial planar [[organic compound]], e.g. [[benzene]] or [[cyclopentadiene]], and the legs being ligands such as [[carbon monoxide|CO]] or [[allyl]].<ref name="Diironanthracenecomplex">{{cite journal | title = A di-iron–anthracene complex via ultrasonics | author1 = Michael J. Begley | author2 = Shakher G. Puntambekar | author3 = Anthony H. Wright | journal = J. Chem. Soc., Chem. Commun. | year = 1987 | pages = 1251–1252}}</ref><ref>{{cite journal | title = Synthesis and reactivity of a new class of half-sandwich arene-iron complex: structure of [C<sub>6</sub>H<sub>3</sub>Me<sub>3</sub>Fe(C<sub>3</sub>H<sub>5</sub>)(CO)] PF<sub>6</sub> | author1 = Michael J. Begley | author2 = Shakher G. Puntambekar | author3 = Anthony H. Wright | journal = J. Organomet. Chem. | year = 1989 | volume = 362 | issue= 1-2 | pages = C11-C14}}</ref>▼
 
[[Image:MMT-3D-balls.png|thumb|right|[[Model bola-dan-tongkat]] metilsiklopentadienil mangan trikarbonil, suatu senyawa "bangku piano"]]
====Dimetallic half sandwich compounds====▼
Compounds such as the [[cyclopentadienyliron dicarbonyl dimer]] and [[cyclopentadienylmolybdenumtricarbonyl dimer]] can be considered a special case of half-sandwiches, except that they are dimetallic.<ref name="Diironanthracenecomplex" /> A structurally related species is [Ru(C<sub>6</sub>H<sub>6</sub>)Cl<sub>2</sub>]<sub>2</sub>.
 
▲[[MetalloceneMetalosena]]s includingyang justmengandung one[[ligan]] facially-boundorganik planar organicyang [[ligand]]berikatan insteadhanya ofdi twosatu givessisi, risebukan todua, amerupakan stillanggota largerkeluarga familybesar ofsenyawa '''halfsetengah sandwich''' compounds. Contoh The most famousyang examplepaling isterkenal probablymungkin [[methylcyclopentadienylmetilsiklopentadienil manganesemangan tricarbonyltrikarbonil]]. Spesies Suchini speciesterkadang aredisebut occasionally referred to assebagai '''pianosenyawa stoolbangku compounds,piano''', at least when there are threesetidaknya diatomicketika ligandsterdapat intiga additionligan todiatomik thetambahan hydrocarbonpada "seatdudukan" ofhidrokarbon thebangku piano stool. TheNama nameini derivesdiberikan fromkarena theadanya similaritykemiripan ofbentuk thestruktur structure to such adengan "stoolbangku", withyang thedudukannya seat being a facial planaradalah [[organicsenyawa compoundorganik]] planar, e.g.contohnya, [[benzenebenzena]] oratau [[cyclopentadienesiklopentadiena]], and thedan legskaki beingbangku ligandsadalah suchligan asseperti [[carbonkarbon monoxidemonoksida|CO]] oratau [[allylalil]].<ref name="Diironanthracenecomplex">{{cite journal | title = A di-iron–anthracene complex via ultrasonics | author1 = Michael J. Begley | author2 = Shakher G. Puntambekar | author3 = Anthony H. Wright | journal = J. Chem. Soc., Chem. Commun. | year = 1987 | pages = 1251–1252}}</ref><ref>{{cite journal | title = Synthesis and reactivity of a new class of half-sandwich arene-iron complex: structure of [C<sub>6</sub>H<sub>3</sub>Me<sub>3</sub>Fe(C<sub>3</sub>H<sub>5</sub>)(CO)] PF<sub>6</sub> | author1 = Michael J. Begley | author2 = Shakher G. Puntambekar | author3 = Anthony H. Wright | journal = J. Organomet. Chem. | year = 1989 | volume = 362 | issue= 1-2 | pages = C11-C14}}</ref>
===Multidecker sandwiches===
The first multidecker sandwich complex was the dicationic tris[[cyclopentadienyl]] dinickel complex [Ni<sub>2</sub>Cp<sub>3</sub>]([[tetrafluoroborate|BF<sub>4</sub>]])<sub>2</sub>. Since that discovery, many related multidecker sandwich compounds have been discovered, especially triple deckers.<ref>Beck, V.; O'Hare, D., "Triple-decker transition metal complexes bridged by a single carbocyclic ring" J. Organomet. Chem. 2004, volume 689, 3920-3938. {{doi|10.1016/j.jorganchem.2004.06.011}}</ref> A versatile method involves the attachment of [[Cp*]]Ru<sup>+</sup> to preformed sandwich complexes.<ref>{{cite journal | author = Fagan, P. J.; Ward, M. D.; Calabrese, J. C. | title = Molecular engineering of solid-state materials: organometallic building blocks | journal = [[J. Am. Chem. Soc.]] | year = 1989 | volume = 111 | issue = 5 | pages = 1698–719 | doi = 10.1021/ja00187a024}}</ref>▼
 
▲====DimetallicSenyawa halfsetengah sandwich compoundsdwilogam====
Senyawa seperti [[dimer siklopentadienil besi dikarbonil]] dan [[dimer siklopentadienil molibdenum trikarbonil]] dapat dipertimbangkan sebagai kasus khusus senyawa setengah sandwich, kecuali bahwa mereka adalah dwilogam.<ref name="Diironanthracenecomplex" /> Spesies dengan struktur terkait adalah {{chem2|[|Ru(C|6|H|6|)|Cl|2|]|2}}.
 
===Sandwich multidek===
▲The first multideckerKompleks sandwich complexmultidek waspertama theadalah dicationickompleks dikation ''tris''[[cyclopentadienylsiklopentadienil]] dinickel complexdwinikel [Ni<sub>2</sub>Cp<sub>3</sub>]([[tetrafluoroboratetetrafluoroborat|BF<sub>4</sub>]])<sub>2</sub>. SinceSejak that discoverydiketemukannya, many relatedbanyak multideckersenyawa sandwich compoundsmultidek haveterkait beenyang discoveredtelah ditemukan, especiallyterutama tripletripel deckersdek.<ref>{{cite|author1=Beck, V.; |author2=O'Hare, D., "|title=Triple-decker transition metal complexes bridged by a single carbocyclic ring" |journal=J. Organomet. Chem. |year=2004, |volume =689, |pages=3920-3938. {{|doi|=10.1016/j.jorganchem.2004.06.011}}</ref> A versatile method involves the attachment of [[Cp*]]Ru<sup>+</sup> to preformed sandwich complexes.<ref>{{cite journal | author = Fagan, P. J.; Ward, M. D.; Calabrese, J. C. | title = Molecular engineering of solid-state materials: organometallic building blocks | journal = [[J. Am. Chem. Soc.]] | year = 1989 | volume = 111 | issue = 5 | pages = 1698–719 | doi = 10.1021/ja00187a024}}</ref>
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===Inverse sandwiches===
In these ''anti''-bimetallic compounds, the metals are found to be bridged by a single carbocyclic ring. Examples include {(THF)<sub>3</sub>Ca}<sub>2</sub>(1,3,5-triphenylbenzene)<ref>{{cite journal | title = Stable "Inverse" Sandwich Complex with Unprecedented Organocalcium(I): Crystal Structures of [(thf)2Mg(Br)-C6H2-2,4,6-Ph3] and [(thf)3Ca{μ-C6H3-1,3,5-Ph3}Ca(thf)3] | author = Sven Krieck, Helmar Gorls, Lian Yu, Markus Reiher and Matthias Westerhausen | journal = [[J. Am. Chem. Soc.]] | year = 2009 | volume = 131 | pages = 2977–2985 | format = Article | doi = 10.1021/ja808524y}}</ref> and {(Ar)
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[[Image:metallocenes3.png]]
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==Referensi==
{{reflist}}
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